5.3 gasser question (No oil pressure)

custom8726 · Feb 13, 2011

My wife has a 05 Envoy Denali with a 5.3 V8. 68k miles.. Today about 2 miles from the house the oil pressure went to 0 and a icon came up on the dash aswell as a message saying to turn the motor off now. I pulled over, turned it off and checked the oil aswell as looked for any leaks. The oil level was fine and I did not see any leaks or obvious issues. I turned around and gently drove back to the house 2 miles away and we took the Duramax to dinner. 4 hrs later I got home and hooked the EFI up to it and fired it up,, 50lbs of oil pressure for about the first 7-8 minutes. Then the oil pressure dropped to 20lb's for about 30 seconds and then to 3lb's and the icons/message came back up.. The oil pressure gauge voltage was reading around 5 at first start up and then averaged around 2V by the end of the 8min run time. So before I start tearing this thing apart to replace a oil pump I figured I would see if you guy's had any ideas or suggestions other then the oil pump? My first thought was a bad oil pressure sensor, but it seems odd that on cold start up it has pressure but then looses it once the engine gets up to temp, almost like the oil is getting hot and thining down and loosing pressure. But if it did not have any pressure you would think you would here something taping in the top end like a lifter or something?

Also does anyone know what the correct oil pressure sensor voltage is? Also were is the oil pressure sensor on the 5.3's? Is it threaded in like the old 5.7's? The reason I ask is I was thinking I could use a mechanical oil gauge if it has a threaded port and verify it's not electrical.. Thanks in advance for any info :hug:

Chevmeister · Feb 13, 2011

Its on the back of the motor. I havent had a 5.3 in a few years, and I never kept one long enough to have to work on it.

ripmf666 · Feb 13, 2011

Service Information
<FORM onsubmit="JavaScript: return true;" method=post name=CellHandlerForm action=/si/cellHandler.do>

2005 GMC Truck Envoy - 4WD | Envoy, Rainier, TrailBlazer, Ascender VIN S/T Service Manual | Engine | Engine Mechanical - 5.3L | Repair Instructions - On Vehicle | Document ID: 1445022 <HR>
Engine Oil Pressure Sensor and/or Switch Replacement
Tools Required

J 41712 Oil Pressure Switch Socket
<A href="http://gsi.xw.gm.com/si/showDoc.do?laborOpCode=&docSyskey=1445022&cellId=133662&pubObjSyskey=1445022&from=sm&pubCellSyskey=133662#ss1-1445022">Removal Procedure

<LI type=1>Disconnect the oil pressure sensor electrical connector (1).
Using J 41712 or equivalent, remove the oil pressure sensor.

<A href="http://gsi.xw.gm.com/si/showDoc.do?laborOpCode=&docSyskey=1445022&cellId=133662&pubObjSyskey=1445022&from=sm&pubCellSyskey=133662#ss2-1445022">Installation Procedure

Notice: Refer to Fastener Notice in the Preface section.

<LI type=1>Apply sealant to the threads of the oil pressure sensor. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number. <LI type=1>Using J 41712 or equivalent, install the oil pressure sensor. Tighten
Tighten the sensor to 35 N·m (26 lb ft).
Connect the oil pressure sensor electrical connector (1).

© 2011 General Motors. All rights reserved.
</FORM>

ripmf666 · Feb 13, 2011

Service Information
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2005 GMC Truck Envoy - 4WD | Envoy, Rainier, TrailBlazer, Ascender VIN S/T Service Manual | Preliminary Information | Document ID: 2435251 <HR>
#PIP4786: Low Oil Pressure Message Light - Inspect Valve Lifter Oil Filter - (Apr 5, 2010)

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Subject:</TD><TD vAlign=top>Low Oil Pressure Message/Light - Inspect Valve Lifter Oil Filter </TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Models:</TD><TD vAlign=top>2007 Cadillac Escalade</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>Built before April 1, 2006 with 6.2L L92 Engine </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>(These engines were built with AFM Hardware but the AFM system was disabled.)</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2009 Buick Lacrosse Super, Allure Super (Canada Only)</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2007 Buick Rainier</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2010 Chevrolet Camaro SS </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007-2010 Chevrolet Avalanche, Silverado, Suburban, Tahoe </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007-2009 Chevrolet Impala </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2009 Chevrolet Trailblazer </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007 Chevrolet Monte Carlo </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007-2010 GMC Sierra, Yukon </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2009 GMC Envoy </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007-2008 Pontiac Grand Prix </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2008-2009 Pontiac G8 </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2009 Saab 97x</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>With an AFM (Active Fuel Management) V8 Engine RPO: L76, L94, L99, LC9, LFA, LH6, LMG, LS4, or LY5 </TD></TR></TBODY></TABLE>

<HR>The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2435251&from=bcpi#ss1-2435251">Condition/Concern:

Some customers may complain of a low oil pressure message/light on the dash and a technician may find a P0521 DTC in the ECM.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2435251&from=bcpi#ss2-2435251">Recommendation/Instructions:

If this concern is encountered, follow SI diagnosis. If it indicates that the Tech 2 oil pressure parameter is low but proper oil pressure is present at the oil filter housing, inspect the Valve Lifter Oil Filter for debris/sludge that could be restricting oil flow to the oil pressure sensor before replacing any parts.
Follow the Valve Lifter Oil Filter Removal and Installation Procedure to remove the filter for inspection. If the filter is plugged, it can normally be cleaned with brake/contact cleaner and light shop air. If it cannot be cleaned for some reason, replace it using the part number listed in the parts catalog. Do not replace the complete Valve Lifter Oil Manifold just because the filter is plugged.
#452 - Valve Lifter Oil Filter

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
<TABLE width="95%"><TBODY><TR><TD width="80%" align=left>GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

</TD><TD width=42 align=middle>

</TD><TD width=167 align=middle>WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
</TD></TR></TBODY></TABLE>

© 2011 General Motors. All rights reserved.
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rgullett83 · Feb 13, 2011

i have seen a few senders go bad, the last one I did was an 07 yukon denali with the 6.2, had to remove the intake to get to it.

custom8726 · Feb 13, 2011

"Valve lifter oil pressure filter" sounds like a good posibility, never heard of it before but sounds plausible. Thanks guys :thumb:

Chevmeister · Feb 13, 2011

And this is why if your working on a GM you need eSI. Mitchell didnt have any of that info or if it did I couldnt find it.

ripmf666 · Feb 13, 2011

Service Information
<FORM onsubmit="JavaScript: return true;" method=post name=CellHandlerForm action=/si/cellHandler.do>

2005 GMC Truck Envoy - 4WD | Envoy, Rainier, TrailBlazer, Ascender VIN S/T Service Manual | Preliminary Information | Document ID: 1406758 <HR>
Engine Mechanical Specifications RPO LH6 VIN M
<TABLE border=1 width="95%"><TBODY><TR><TH vAlign=bottom rowSpan=2 align=middle>Application
</TH><TH vAlign=bottom colSpan=2 align=middle>Specification
</TH></TR><TR><TH vAlign=bottom align=middle>Metric
</TH><TH vAlign=bottom align=middle>English
</TH></TR><TR><TD vAlign=center colSpan=3 align=left>General
</TD></TR><TR><TD vAlign=center align=left>

Engine Type

</TD><TD vAlign=center colSpan=2 align=middle>V8
</TD></TR><TR><TD vAlign=center align=left>

Displacement

</TD><TD vAlign=center align=middle>5.3L
</TD><TD vAlign=center align=middle>325 CID
</TD></TR><TR><TD vAlign=center align=left>

RPO

</TD><TD vAlign=center colSpan=2 align=middle>LH6
</TD></TR><TR><TD vAlign=center align=left>

VIN

</TD><TD vAlign=center colSpan=2 align=middle>M
</TD></TR><TR><TD vAlign=center align=left>

Bore

</TD><TD vAlign=center align=middle>96.0-96.018 mm
</TD><TD vAlign=center align=middle>3.779-3.78 in
</TD></TR><TR><TD vAlign=center align=left>

Stroke

</TD><TD vAlign=center align=middle>92.0 mm
</TD><TD vAlign=center align=middle>3.622 in
</TD></TR><TR><TD vAlign=center align=left>

Compression Ratio

</TD><TD vAlign=center colSpan=2 align=middle>9.95:1
</TD></TR><TR><TD vAlign=center align=left>

Firing Order

</TD><TD vAlign=center colSpan=2 align=middle>1-8-7-2-6-5-4-3
</TD></TR><TR><TD vAlign=center align=left>

Displacement-on-Demand Cylinders

</TD><TD vAlign=center colSpan=2 align=middle>1-4-6-7
</TD></TR><TR><TD vAlign=center align=left>

Spark Plug Gap

</TD><TD vAlign=center align=middle>1.02 mm
</TD><TD vAlign=center align=middle>0.04 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Block
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Bearing Bore 1 and 5 Diameter

</TD><TD vAlign=center align=middle>59.58-59.63 mm
</TD><TD vAlign=center align=middle>2.345-2.347 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Bearing Bore 2 and 4 Diameter

</TD><TD vAlign=center align=middle>59.08-59.13 mm
</TD><TD vAlign=center align=middle>2.325-2.327 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Bearing Bore 3 Diameter

</TD><TD vAlign=center align=middle>58.58-58.63 mm
</TD><TD vAlign=center align=middle>2.306-2.308 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Bearing Bore Diameter

</TD><TD vAlign=center align=middle>69.871-69.889 mm
</TD><TD vAlign=center align=middle>2.75-2.751 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Bearing Bore Out-of-Round

</TD><TD vAlign=center align=middle>0.006 mm
</TD><TD vAlign=center align=middle>0.0002 in
</TD></TR><TR><TD vAlign=center align=left>

Cylinder Bore Diameter

</TD><TD vAlign=center align=middle>96.0-96.018 mm
</TD><TD vAlign=center align=middle>3.779-3.78 in
</TD></TR><TR><TD vAlign=center align=left>

Cylinder Head Deck Height - Measuring from the Centerline of Crankshaft to the Deck Face

</TD><TD vAlign=center align=middle>234.57-234.82 mm
</TD><TD vAlign=center align=middle>9.235-9.245 in
</TD></TR><TR><TD vAlign=center align=left>

Cylinder Head Deck Surface Flatness - Measured Within a 152.4 mm (6.0 in) Area

</TD><TD vAlign=center align=middle>0.11 mm
</TD><TD vAlign=center align=middle>0.004 in
</TD></TR><TR><TD vAlign=center align=left>

Cylinder Head Deck Surface Flatness - Measuring the Overall Length of the Block Deck

</TD><TD vAlign=center align=middle>0.22 mm
</TD><TD vAlign=center align=middle>0.008 in
</TD></TR><TR><TD vAlign=center align=left>

Valve Lifter Bore Diameter

</TD><TD vAlign=center align=middle>21.417-21.443 mm
</TD><TD vAlign=center align=middle>0.843-0.844 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Camshaft
</TD></TR><TR><TD vAlign=center align=left>

Camshaft End Play

</TD><TD vAlign=center align=middle>0.025-0.305 mm
</TD><TD vAlign=center align=middle>0.001-0.012 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Journal Diameter

</TD><TD vAlign=center align=middle>54.99-55.04 mm
</TD><TD vAlign=center align=middle>2.164-2.166 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Bearing Diameter

</TD><TD vAlign=center align=middle>55.063-55.088 mm
</TD><TD vAlign=center align=middle>2.1678-2.1688 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Journal-to-Bearing Clearance

</TD><TD vAlign=center align=middle>0.023-0.098 mm
</TD><TD vAlign=center align=middle>0.0009-0.0038 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Journal Out-of-Round

</TD><TD vAlign=center align=middle>0.025 mm
</TD><TD vAlign=center align=middle>0.001 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Lobe Lift - Intake - Non Displacement-on-Demand Cylinders

</TD><TD vAlign=center align=middle>7.20 mm
</TD><TD vAlign=center align=middle>0.283 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Lobe Lift - Intake - Displacement-on-Demand Cylinders

</TD><TD vAlign=center align=middle>7.33 mm
</TD><TD vAlign=center align=middle>0.289 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Lobe Lift - Exhaust - Non Displacement-on-Demand Cylinders

</TD><TD vAlign=center align=middle>7.20 mm
</TD><TD vAlign=center align=middle>0.283 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Lobe Lift - Exhaust - Displacement-on-Demand Cylinders

</TD><TD vAlign=center align=middle>7.33 mm
</TD><TD vAlign=center align=middle>0.289 in
</TD></TR><TR><TD vAlign=center align=left>

Camshaft Runout - Measured at the Intermediate Journals

</TD><TD vAlign=center align=middle>0.05 mm
</TD><TD vAlign=center align=middle>0.002 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Connecting Rod
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Bearing Clearance - Production

</TD><TD vAlign=center align=middle>0.023-0.065 mm
</TD><TD vAlign=center align=middle>0.0009-0.0025 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Bearing Clearance - Service

</TD><TD vAlign=center align=middle>0.023-0.076 mm
</TD><TD vAlign=center align=middle>0.0009-0.003 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Bore Diameter - Bearing End

</TD><TD vAlign=center align=middle>56.505-56.525 mm
</TD><TD vAlign=center align=middle>2.224-2.225 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Bore Out-of-Round - Bearing End - Production

</TD><TD vAlign=center align=middle>0.004-0.008 mm
</TD><TD vAlign=center align=middle>0.00015-0.0003 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Bore Out-of-Round - Bearing End - Service

</TD><TD vAlign=center align=middle>0.004-0.008 mm
</TD><TD vAlign=center align=middle>0.00015-0.0003 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Side Clearance

</TD><TD vAlign=center align=middle>0.11-0.51 mm
</TD><TD vAlign=center align=middle>0.00433-0.02 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Crankshaft
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Journal Diameter - Production

</TD><TD vAlign=center align=middle>53.318-53.338 mm
</TD><TD vAlign=center align=middle>2.0991-2.0999 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Journal Diameter - Service

</TD><TD vAlign=center align=middle>53.308 mm
</TD><TD vAlign=center align=middle>2.0987 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Journal Out-of-Round - Production

</TD><TD vAlign=center align=middle>0.005 mm
</TD><TD vAlign=center align=middle>0.0002 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Journal Out-of-Round - Service

</TD><TD vAlign=center align=middle>0.01 mm
</TD><TD vAlign=center align=middle>0.0004 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Production

</TD><TD vAlign=center align=middle>0.005 mm
</TD><TD vAlign=center align=middle>0.0002 in
</TD></TR><TR><TD vAlign=center align=left>

Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Service

</TD><TD vAlign=center align=middle>0.02 mm
</TD><TD vAlign=center align=middle>0.00078 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft End Play

</TD><TD vAlign=center align=middle>0.04-0.2 mm
</TD><TD vAlign=center align=middle>0.0015-0.0078 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Bearing Clearance - Production

</TD><TD vAlign=center align=middle>0.02-0.052 mm
</TD><TD vAlign=center align=middle>0.0008-0.0021 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Bearing Clearance - Service

</TD><TD vAlign=center align=middle>0.02-0.065 mm
</TD><TD vAlign=center align=middle>0.0008-0.0025 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Journal Diameter - Production

</TD><TD vAlign=center align=middle>64.992-65.008 mm
</TD><TD vAlign=center align=middle>2.558-2.559 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Journal Diameter - Service

</TD><TD vAlign=center align=middle>64.992 mm
</TD><TD vAlign=center align=middle>2.558 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Journal Out-of-Round - Production

</TD><TD vAlign=center align=middle>0.003 mm
</TD><TD vAlign=center align=middle>0.000118 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Journal Out-of-Round - Service

</TD><TD vAlign=center align=middle>0.008 mm
</TD><TD vAlign=center align=middle>0.0003 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Journal Taper - Production

</TD><TD vAlign=center align=middle>0.01 mm
</TD><TD vAlign=center align=middle>0.0004 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Main Journal Taper - Service

</TD><TD vAlign=center align=middle>0.02 mm
</TD><TD vAlign=center align=middle>0.00078 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Rear Flange Runout

</TD><TD vAlign=center align=middle>0.05 mm
</TD><TD vAlign=center align=middle>0.002 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Reluctor Ring Runout - Measured 1.0 mm (0.04 in) Below Tooth Diameter

</TD><TD vAlign=center align=middle>0.7 mm
</TD><TD vAlign=center align=middle>0.028 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Thrust Surface - Production

</TD><TD vAlign=center align=middle>26.14-26.22 mm
</TD><TD vAlign=center align=middle>1.029-1.0315 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Thrust Surface - Service

</TD><TD vAlign=center align=middle>26.22 mm
</TD><TD vAlign=center align=middle>1.0315 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Thrust Surface Runout

</TD><TD vAlign=center align=middle>0.025 mm
</TD><TD vAlign=center align=middle>0.001 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Cylinder Head
</TD></TR><TR><TD vAlign=center align=left>

Cylinder Head Height/Thickness - Measured from the Cylinder Head Deck to the Valve Rocker Arm Cover Seal Surface

</TD><TD vAlign=center align=middle>120.2 mm
</TD><TD vAlign=center align=middle>4.732 in
</TD></TR><TR><TD vAlign=center align=left>

Surface Flatness - Block Deck - Measured Within a 152.4 mm (6.0 in) Area

</TD><TD vAlign=center align=middle>0.08 mm
</TD><TD vAlign=center align=middle>0.003 in
</TD></TR><TR><TD vAlign=center align=left>

Surface Flatness - Block Deck - Measuring the Overall Length of the Cylinder Head

</TD><TD vAlign=center align=middle>0.1 mm
</TD><TD vAlign=center align=middle>0.004 in
</TD></TR><TR><TD vAlign=center align=left>

Surface Flatness - Exhaust Manifold Deck

</TD><TD vAlign=center align=middle>0.13 mm
</TD><TD vAlign=center align=middle>0.005 in
</TD></TR><TR><TD vAlign=center align=left>

Surface Flatness - Intake Manifold Deck

</TD><TD vAlign=center align=middle>0.08 mm
</TD><TD vAlign=center align=middle>0.0031 in
</TD></TR><TR><TD vAlign=center align=left>

Valve Guide Installed Height - Measured from the Spring Seat Surface to the Top of the Guide

</TD><TD vAlign=center align=middle>17.32 mm
</TD><TD vAlign=center align=middle>0.682 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Intake Manifold
</TD></TR><TR><TD vAlign=center align=left>

Surface Flatness - Measured at Gasket Sealing Surfaces and Measured Within a 200 mm (7.87 in) Area that Includes Two Runner Port Openings

</TD><TD vAlign=center align=middle>0.3 mm
</TD><TD vAlign=center align=middle>0.118 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Lubrication System
</TD></TR><TR><TD vAlign=center align=left>

Oil Capacity - with Filter

</TD><TD vAlign=center align=middle>5.68 liters
</TD><TD vAlign=center align=middle>6.0 quarts
</TD></TR><TR><TD vAlign=center align=left>

Oil Capacity - without Filter

</TD><TD vAlign=center align=middle>5.20 liters
</TD><TD vAlign=center align=middle>5.5 quarts
</TD></TR><TR><TD vAlign=center align=left>

Oil Pressure - Minimum - Hot

</TD><TD vAlign=center align=middle>41 kPa at 1,000 engine RPM
124 kPa at 2,000 engine RPM
165 kPa at 4,000 engine RPM
</TD><TD vAlign=center align=middle>6 psig at 1,000 engine RPM
18 psig at 2,000 engine RPM
24 psig at 4,000 engine RPM
</TD></TR><TR><TD vAlign=center align=left>

Displacement-on-Demand Relief Valve Oil Pressure - as Measured at Oil Pressure Sensor Location

</TD><TD vAlign=center align=middle>379-517 kPa Maximum
</TD><TD vAlign=center align=middle>55-75 psig Maximum
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Oil Pan
</TD></TR><TR><TD vAlign=center align=left>

Front Cover Alignment - at Oil Pan Surface

</TD><TD vAlign=center align=middle>0.0-0.5 mm
</TD><TD vAlign=center align=middle>0.0-0.02 in
</TD></TR><TR><TD vAlign=center align=left>

Crankshaft Rear Oil Seal Housing Alignment - at Oil Pan Surface

</TD><TD vAlign=center align=middle>0.0-0.5 mm
</TD><TD vAlign=center align=middle>0.0-0.02 in
</TD></TR><TR><TD vAlign=center align=left>

Oil Pan Alignment - to Rear of Engine Block at Transmission Bell Housing Mounting Surface

</TD><TD vAlign=center align=middle>0.0-0.1 mm
</TD><TD vAlign=center align=middle>0.0-0.004 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Piston Rings
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Production

</TD><TD vAlign=center align=middle>0.23-0.44 mm
</TD><TD vAlign=center align=middle>0.009-0.017 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Service

</TD><TD vAlign=center align=middle>0.23-0.5 mm
</TD><TD vAlign=center align=middle>0.009-0.0196 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production

</TD><TD vAlign=center align=middle>0.44-0.7 mm
</TD><TD vAlign=center align=middle>0.017-0.027 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Service

</TD><TD vAlign=center align=middle>0.44-0.76 mm
</TD><TD vAlign=center align=middle>0.0173-0.03 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production

</TD><TD vAlign=center align=middle>0.18-0.75 mm
</TD><TD vAlign=center align=middle>0.007-0.029 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service

</TD><TD vAlign=center align=middle>0.18-0.81 mm
</TD><TD vAlign=center align=middle>0.007-0.032 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring-to-Groove Clearance - First Compression Ring - Production

</TD><TD vAlign=center align=middle>0.04-0.085 mm
</TD><TD vAlign=center align=middle>0.00157-0.00335 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring-to-Groove Clearance - First Compression Ring - Service

</TD><TD vAlign=center align=middle>0.04-0.085 mm
</TD><TD vAlign=center align=middle>0.00157-0.00335 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring-to-Groove Clearance - Second Compression Ring - Production

</TD><TD vAlign=center align=middle>0.04-0.078 mm
</TD><TD vAlign=center align=middle>0.00157-0.0031 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring-to-Groove Clearance - Second Compression Ring - Service

</TD><TD vAlign=center align=middle>0.04-0.078 mm
</TD><TD vAlign=center align=middle>0.00157-0.0031 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring-to-Groove Clearance - Oil Control Ring - Production

</TD><TD vAlign=center align=middle>0.012-0.2 mm
</TD><TD vAlign=center align=middle>0.0005-0.0078 in
</TD></TR><TR><TD vAlign=center align=left>

Piston Ring-to-Groove Clearance - Oil Control Ring - Service

</TD><TD vAlign=center align=middle>0.012-0.2 mm
</TD><TD vAlign=center align=middle>0.0005-0.0078 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Pistons and Pins
</TD></TR><TR><TD vAlign=center align=left>

Pin - Piston Pin Clearance-to-Piston Pin Bore - Production

</TD><TD vAlign=center align=middle>0.002-0.01 mm
</TD><TD vAlign=center align=middle>0.00008-0.0004 in
</TD></TR><TR><TD vAlign=center align=left>

Pin - Piston Pin Clearance-to-Piston Pin Bore - Service

</TD><TD vAlign=center align=middle>0.002-0.015 mm
</TD><TD vAlign=center align=middle>0.00008-0.0006 in
</TD></TR><TR><TD vAlign=center align=left>

Pin - Piston Pin Diameter

</TD><TD vAlign=center align=middle>23.952-23.955 mm
</TD><TD vAlign=center align=middle>0.943-0.943 in
</TD></TR><TR><TD vAlign=center align=left>

Pin - Piston Pin Fit in Connecting Rod Bore - Production

</TD><TD vAlign=center align=middle>0.007-0.02 mm
</TD><TD vAlign=center align=middle>0.00027-0.00078 in
</TD></TR><TR><TD vAlign=center align=left>

Pin - Piston Pin Fit in Connecting Rod Bore - Service

</TD><TD vAlign=center align=middle>0.007-0.022 mm
</TD><TD vAlign=center align=middle>0.00027-0.00086 in
</TD></TR><TR><TD vAlign=center align=left>

Piston - Piston Diameter - Measured Over Skirt Coating

</TD><TD vAlign=center align=middle>96.002-96.036 mm
</TD><TD vAlign=center align=middle>3.779-3.78 in
</TD></TR><TR><TD vAlign=center align=left>

Piston - Piston-to-Bore Clearance - Production

</TD><TD vAlign=center align=middle>-0.036 to +0.016 mm
</TD><TD vAlign=center align=middle>-0.0014 to +0.0006 in
</TD></TR><TR><TD vAlign=center align=left>

Piston - Piston-to-Bore Clearance - Service Limit with Skirt Coating Worn Off

</TD><TD vAlign=center align=middle>0.071 mm
</TD><TD vAlign=center align=middle>0.0028 in
</TD></TR><TR><TD vAlign=center colSpan=3 align=left>Valve System
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Face Angle

</TD><TD vAlign=center colSpan=2 align=middle>45 degrees
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Face Width

</TD><TD vAlign=center align=middle>1.25 mm
</TD><TD vAlign=center align=middle>0.05 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Lash

</TD><TD vAlign=center colSpan=2 align=middle>Net Lash - No Adjustment
</TD></TR><TR><TD vAlign=center align=left>

Valve Lift - Intake - Non Displacement on Demand

</TD><TD vAlign=center align=middle>12.24 mm
</TD><TD vAlign=center align=middle>0.482 in
</TD></TR><TR><TD vAlign=center align=left>

Valve Lift - Intake - Displacement on Demand

</TD><TD vAlign=center align=middle>12.41 mm
</TD><TD vAlign=center align=middle>0.489 in
</TD></TR><TR><TD vAlign=center align=left>

Valve Lift - Exhaust - Non Displacement on Demand

</TD><TD vAlign=center align=middle>12.24 mm
</TD><TD vAlign=center align=middle>0.482 in
</TD></TR><TR><TD vAlign=center align=left>

Valve Lift - Exhaust - Displacement on Demand

</TD><TD vAlign=center align=middle>12.41 mm
</TD><TD vAlign=center align=middle>0.489 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Seat Angle

</TD><TD vAlign=center colSpan=2 align=middle>46 degrees
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Seat Runout

</TD><TD vAlign=center align=middle>0.05 mm
</TD><TD vAlign=center align=middle>0.002 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Seat Width - Exhaust

</TD><TD vAlign=center align=middle>1.78 mm
</TD><TD vAlign=center align=middle>0.07 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Seat Width - Intake

</TD><TD vAlign=center align=middle>1.02 mm
</TD><TD vAlign=center align=middle>0.04 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Stem Diameter - Production

</TD><TD vAlign=center align=middle>7.955-7.976 mm
</TD><TD vAlign=center align=middle>0.313-0.314 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Stem Diameter - Service

</TD><TD vAlign=center align=middle>7.95 mm
</TD><TD vAlign=center align=middle>0.313 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Stem-to-Guide Clearance - Production - Intake

</TD><TD vAlign=center align=middle>0.025-0.066 mm
</TD><TD vAlign=center align=middle>0.001-0.0026 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Stem-to-Guide Clearance - Service - Intake

</TD><TD vAlign=center align=middle>0.093 mm
</TD><TD vAlign=center align=middle>0.0037 in
</TD></TR><TR><TD vAlign=center>

Valves - Valve Stem Height - Measured from Spring Seat - Intake and Exhaust

</TD><TD vAlign=center align=middle>50.85 +/- 0.375 mm
</TD><TD vAlign=center align=middle>2.00 +/- 0.015 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Stem-to-Guide Clearance - Production - Exhaust

</TD><TD vAlign=center align=middle>0.025-0.066 mm
</TD><TD vAlign=center align=middle>0.001-0.0026 in
</TD></TR><TR><TD vAlign=center align=left>

Valves - Valve Stem-to-Guide Clearance - Service - Exhaust

</TD><TD vAlign=center align=middle>0.093 mm
</TD><TD vAlign=center align=middle>0.0037 in
</TD></TR><TR><TD vAlign=center align=left>

Rocker Arms - Valve Rocker Arm Ratio

</TD><TD vAlign=center colSpan=2 align=middle>1.70:1
</TD></TR><TR><TD vAlign=center align=left>

Valve Springs - Valve Spring Free Length

</TD><TD vAlign=center align=middle>52.9 mm
</TD><TD vAlign=center align=middle>2.08 in
</TD></TR><TR><TD vAlign=center align=left>

Valve Springs - Valve Spring Installed Height

</TD><TD vAlign=center align=middle>45.75 mm
</TD><TD vAlign=center align=middle>1.8 in
</TD></TR><TR><TD vAlign=center align=left>

Valve Springs - Valve Spring Load - Closed

</TD><TD vAlign=center align=middle>340 N at 45.75 mm
</TD><TD vAlign=center align=middle>76 lb at 1.8 in
</TD></TR><TR><TD vAlign=center align=left>

Valve Springs - Valve Spring Load - Open

ripmf666 · Feb 13, 2011

Service Information
<FORM onsubmit="JavaScript: return true;" method=post name=CellHandlerForm action=/si/cellHandler.do>

2005 GMC Truck Envoy - 4WD | Envoy, Rainier, TrailBlazer, Ascender VIN S/T Service Manual | Preliminary Information | Document ID: 1406816 <HR>
Oil Pressure Diagnosis and Testing
Tools Required

<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>J 21867 Pressure Gauge</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>J 42907 Oil Pressure Tester</TD></TR></TBODY></TABLE>

<LI type=1>With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time, 2-3 minutes, and measure the oil level. <LI type=1>If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator. <LI type=1>Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gauge or light. <LI type=1>Listen for a noisy valve train or a knocking noise. <LI type=1>Inspect for the following conditions:
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Oil diluted by water or glycol antifreeze</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> </TD><TD vAlign=top>Refer to Coolant in Engine Oil.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Foamy oil, which may be caused by a cut or damaged oil pump screen O-ring seal</TD></TR></TBODY></TABLE>
<LI type=1>Remove the oil filter and install the J 42907 (1). <LI type=1>Install the J 21867 (2), or equivalent to the J 42907 (1). <LI type=1>Run the engine and measure the engine oil pressure. <LI type=1>Compare the readings to Engine Mechanical Specifications.
If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Oil pump worn or dirty</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> </TD><TD vAlign=top>Refer to Oil Pump Cleaning and Inspection.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Oil pump-to-engine block bolts loose</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> </TD><TD vAlign=top>Refer to Oil Pump, Screen and Crankshaft Oil Deflector Installation.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Oil pump screen loose, plugged, or damaged</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Oil pump screen O-ring seal missing or damaged</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Oil filter tube loose or a leaking or damaged gasket</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Malfunctioning oil pump pressure relief valve</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Excessive bearing clearance</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Cracked, porous, or restricted oil galleries</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Oil gallery plugs missing or incorrectly installed</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> </TD><TD vAlign=top>Refer to Engine Block Plug Installation.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Improper operation of the displacement on demand (DoD) oil pressure relief valve</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> </TD><TD vAlign=top>Refer to Displacement on Demand (DoD) Oil Pressure Relief Valve Diagnosis and Testing.</TD></TR></TBODY></TABLE>

68skylark455 · Feb 15, 2011

The earlier 5.3's had a o'ring bulletin where the o'rings on the pick-up tube to oil pump would leak after it warmed up but we usually heard some lifter tapping when it was doing it.

custom8726 · Mar 3, 2011

sludge build up on the screen was the culprit.. Ran Napa engine flush through it and changed the oil and filter 1k ago, so far so good:thumb:

custom8726 · Mar 22, 2011

Man, I really hate this FXXXing 5.3

Well today While my wife was driving a ECM p0050 & p0155 code tripped the check engine light to come back on. Not that this is related to the original issue of this thread but I figured maybe someone here (Henry:hug

might have an idea were to start? I am seriously trading this P.O.S. in directly after I fix it again

68skylark455 · Mar 22, 2011

Oxygen sensor Bank 2 (Passenger side) sensor 1
P0050 HO2S circuit high Bk 2 sensor 1
P0155 HO2S heater malfunction Bk 2 Sensor 1
See if you might have unplugged it or caught something with the wire.

custom8726 · Mar 22, 2011

68skylark455 said:
Oxygen sensor Bank 2 (Passenger side) sensor 1
P0050 HO2S circuit high Bk 2 sensor 1
P0155 HO2S heater malfunction Bk 2 Sensor 1
See if you might have unplugged it or caught something with the wire.

Definetly did not unplug it or catch anything. I never messed with anything to do with the O2 sensors or heaters and the original problem has been fixed for over a month.. I googled it and it looks like it could be numerous things, from 02 sensors, to grounded out wires, to a possible fuse that controls the 02 sensor heater's

I dont mind wrenching on my 05 because I beat the sh!t out of it and expect it to break but this thing is my wifes DD and has a easy life but yet is plagued with little problems constantly

Think we are going to trade it in on a Yukon Denali with a 6.2 or a BMW X5, I voted new D-max or CTS V but the boss says NO

custom8726 · Apr 2, 2011

Problem solved

.

jmaz268 · Jul 9, 2011

ripmf666 said:
Service Information
<FORM onsubmit="JavaScript: return true;" method=post name=CellHandlerForm action=/si/cellHandler.do>

2005 GMC Truck Envoy - 4WD | Envoy, Rainier, TrailBlazer, Ascender VIN S/T Service Manual | Preliminary Information | Document ID: 2435251 <HR>
#PIP4786: Low Oil Pressure Message Light - Inspect Valve Lifter Oil Filter - (Apr 5, 2010)

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Subject:</TD><TD vAlign=top>Low Oil Pressure Message/Light - Inspect Valve Lifter Oil Filter </TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Models:</TD><TD vAlign=top>2007 Cadillac Escalade</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>Built before April 1, 2006 with 6.2L L92 Engine </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>(These engines were built with AFM Hardware but the AFM system was disabled.)</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2009 Buick Lacrosse Super, Allure Super (Canada Only)</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2007 Buick Rainier</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2010 Chevrolet Camaro SS </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007-2010 Chevrolet Avalanche, Silverado, Suburban, Tahoe </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007-2009 Chevrolet Impala </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2009 Chevrolet Trailblazer </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007 Chevrolet Monte Carlo </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007-2010 GMC Sierra, Yukon </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2009 GMC Envoy </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2007-2008 Pontiac Grand Prix </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2008-2009 Pontiac G8 </TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>2005-2009 Saab 97x</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top width=100></TD><TD vAlign=top>With an AFM (Active Fuel Management) V8 Engine RPO: L76, L94, L99, LC9, LFA, LH6, LMG, LS4, or LY5 </TD></TR></TBODY></TABLE>

<HR>The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2435251&from=bcpi#ss1-2435251">Condition/Concern:

Some customers may complain of a low oil pressure message/light on the dash and a technician may find a P0521 DTC in the ECM.
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2435251&from=bcpi#ss2-2435251">Recommendation/Instructions:

If this concern is encountered, follow SI diagnosis. If it indicates that the Tech 2 oil pressure parameter is low but proper oil pressure is present at the oil filter housing, inspect the Valve Lifter Oil Filter for debris/sludge that could be restricting oil flow to the oil pressure sensor before replacing any parts.
Follow the Valve Lifter Oil Filter Removal and Installation Procedure to remove the filter for inspection. If the filter is plugged, it can normally be cleaned with brake/contact cleaner and light shop air. If it cannot be cleaned for some reason, replace it using the part number listed in the parts catalog. Do not replace the complete Valve Lifter Oil Manifold just because the filter is plugged.
#452 - Valve Lifter Oil Filter

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
<TABLE width="95%"><TBODY><TR><TD width="80%" align=left>GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

</TD><TD width=42 align=middle>

</TD><TD width=167 align=middle>WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
</TD></TR></TBODY></TABLE>
© 2011 General Motors. All rights reserved.
</FORM>

A friends Denali is doing the same thing....rough Idle, comes and goes it seems. Just started in the past day. Where exactly is this filter at? Under the valve covers? Hard to tell from the pics and I don't have easy access to the truck to see it.

ripmf666 · Jul 9, 2011

Service Information
<FORM method=post name=CellHandlerForm action=/si/cellHandler.do>

2007 GMC Truck Yukon Denali | Avalanche, Escalade, Suburban, Tahoe, Yukon VIN C/K Service Manual | Document ID: 1697127 <HR>
Valve Lifter Oil Filter Replacement
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1697127&cellId=144299&pubObjSyskey=1697127&from=sm&pubCellSyskey=144299&deliveryEffectiveDate=Jul+1%2C+2011#ss1-1697127">Removal Procedure

Remove the intake manifold. Refer to Intake Manifold Replacement.
Disconnect the engine harness electrical connector (1) from the oil pressure sensor.
Remove the oil pressure sensor (1) and washer (2).
Remove and discard the valve lifter oil filter (3).
Remove and discard the valve lifter oil filter O-ring seal (4).

<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1697127&cellId=144299&pubObjSyskey=1697127&from=sm&pubCellSyskey=144299&deliveryEffectiveDate=Jul+1%2C+2011#ss2-1697127">Installation Procedure

Install a NEW valve lifter oil filter O-ring seal (4) into the valve lifter oil manifold.
Install the NEW valve lifter oil filter (3).
Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the oil pressure sensor.Notice: Refer to Fastener Notice in the Preface section.
Install the oil pressure sensor washer (2) and sensor (1).Tighten
Tighten the sensor to 35 N·m (26 lb ft).
Connect the engine harness electrical connector (1) to the oil pressure sensor.
Install the intake manifold. Refer to Intake Manifold Replacement.

jmaz268 · Jul 9, 2011

thanks henry...helps a ton

jd_ss · Dec 6, 2012

So what fixed the problem? Same issue here!

5.3 gasser question (No oil pressure)

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