bent rod!
- Thread starter 02bigstrokin
- Start date
meening maf limmiting table's are maxed out ... or none at all and dtc's are shut off ect ? its not really relavent . check the timming from 10-55 mm3 and 1600-3800 that whole corner of the table . had to pull timming . pulled basically part throttle timming... mine is like 3-4 deg tappered to 8 deg toward the top of the rpm spectrom gets higher than 8 toward 45-55 mm3 . and the 50/50 timing calculator was perfect zero knock .
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Thanks Trentnell, I will look into this when I get back to my laptop at the house
I believe the the new LBZ pump he just bought is junk and about to lock up................He is gonna call me back when he gets the pump torn apart
I believe the the new LBZ pump he just bought is junk and about to lock up................He is gonna call me back when he gets the pump torn apart
The CP3?
How would that make the injectors knock? Was RP all over the place?
Dale,
We never got to get some good logs of it on the street but he went to the track yesterday and got some good logs and his new LBZ pump wont make over 24k and drops down to 18k by the end of the track. He has it out of the truck and can barley spin it over by hand
We changed the #7 Injector because it was out of spec and I thought it might have been stuck open.......also for some reason when I cut out #7 under DVT the noise got much more quiet. When this didnt fix the noise I was stumped until I saw Josh's new logs from the strip.
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That's not good. I could see a knock occuring if the plungers were sticking in the barrels but I would think the noise would be isolated to the pump and fuel rails.But I don't know how that would cause injectors to knock unless it was bad enough to make pressure spikes during injection-know what I mean?
The problem was Dale that the knock was soo loud at first that it was echoing from the pump to the rails and I couldnt pin point it. Also with white smoke at idle and the balance rate bad on #7 I just jumped to conclusion. From the sound of what Josh is saying the pump sound like its about to lock up which now makes sense that the noise was in the B&P's
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i can turn it by hand but you can hear in the rear cover a knocking sound just by turning it. the stock one i put back in is smooth. the noise was in the fuel rails. havent got it back up and running yet as its late and ill do it in the morning, but im betting thats my problem. and yes rp is all over the place, never even gets to 24 drops to 18-19 then 20-21 then back to 19. hopefully this will fix it and i can better my track times.
Well good to hear you found the issue. I can see why pin pointing it would be tough just by listening to it.
That rear cover contains the little gear lift pump IIRC. Maybe the shaft or gears are damaged. Would be interesting to know what failed to make such a racket!
That rear cover contains the little gear lift pump IIRC. Maybe the shaft or gears are damaged. Would be interesting to know what failed to make such a racket!
That pump ran flawlessly in my truck all last year, it was brand new when i bought it, and got pulled out in october when i pulled the motor and has set on the shelf every since. The only reason i sold it cause i had thought about getting out of things and i had my whole kit for sale, let me know when you pull the back cover off the pump as ive never heard of a cp3 just going bad like that. I will get timthecarman2004 from st joe diesel to chime in too, i never ran the pump on my truck by it self, but it was the one if the valley, with twins the truck held 28k psi with no problem at all.
Changed pumps and the noise is still there. The truck is back to completely stock with the twins. Bone stock tune and its still there. I am at a loss. I have no more ideas other than its internal. Motor has 390 PSI compression all the way around. Truck wont make full rail pressure. Hits 24k and falls off to 18k. The noise is very eratic and has no steady rythm. You can barely here it outside but you can hear plain as day when in the cab.
Any ideas as Josh and I are out of them.
FICM??? Call Johnboy, he has some good experience diagnosing fuel related issues. You probably remember his debackle back when he first put his truck back together.
C-ya
C-ya
Tensioner pulley arm? When they start to go they make a racket that can be hard to locate. It's a grasp but you're asking for ideas.
that was one of the first things I checked.
another things, all the balance rates are perfect.
I did find this old TSB in my searching though
Service Bulletin
Bulletin No.: 02-06-01-022A
Date: November 2002
Chevrolet/GMC
Information
Subject: Information on Engine Ticking
Models: 2001-2003 Chevrolet Silverado
2003 Chevrolet Kodiak C4500/C5500 Series
2001-2003 GMC Sierra
2003 GMC Topkick C4500/C5500 Series
with 6.6L Duramax™ Diesel Engine (VIN 1 – RPO LB7)
Some of the above vehicles may exhibit a random ticking noise that is most audible on an engine with a coolant temperature of 70°C (158°F) or higher and from idle to approximately 1500 RPM. The noise usually is most noticeable at the rear of the drivers’ side front wheel well. Customers may also comment about hearing a tick noise inside the vehicle at idle such as when sitting at a drive through window. All 6600 Duramax™ diesel engines have this condition; however, some are more audible than others. Engine build variation from engine to engine contributes to differences in perceived volume. All Duramax™ engines are manufactured to very close tolerances to meet the durability and reliability standards.
This noise is caused by the relationship of the engine cylinder block, crankshaft journals, bearing inserts and the oil film. This relationship may allow a vibration that resonates through the cylinder block and is heard as a metallic ticking noise. The noise could be described as an irregular ticking or clacking sound, like random typing on a mechanical typewriter.
This condition has been present in diesel engines produced for the last 20 or more years. The overall noise reduction in engines produced today makes this noise seem new when, in fact, it was masked by other noises in the past.
Many manufacturers such as Isuzu, Hino, Mitsubishi, and Nissan report a similar condition in their diesel engines. Testing and engine teardowns with this condition reveal no condition that would affect reliability or durability of this engine.
Dealers should not attempt to compare any customer vehicles exhibiting this noise with other similar vehicle as the noise is different from vehicle to vehicle and this may lead to the incorrect conclusion that the vehicle has a condition. Thisnoise is a normaloperating characteristic of the engine. This noise has no short or long term effects on the engine. Do not attempt repairs for this noise.
Important: Replacing the engine or internal components for this noise will not reduce or eliminate the noise.
Please share the information found in this bulletin with customers who inquire about this condition. In they event they have additional questions or concerns, please contact Customer Assistance at the numbers listed below for further information.