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J
2009 LMM won't rev over 2k rpms.
Well, we got it :woott: Combination of 3 slightly bent teeth on the crank reluctor and a warped CKP housing causing a phantom sync gap to appear at high rpms, thus causing the injector to attempt to fire twice on the same stroke. Once the computer would see the injector grounding out... -
J
2009 LMM won't rev over 2k rpms.
Hey guys. Checking in with an update. Finished the pump last week and no bueno, same shit. "Rev limiter" still kicking in, Primer still stays soft which i find odd. The only check valve labelled in that return line is the one built into the pump. Unless here's a check valve in the junction... -
J
2009 LMM won't rev over 2k rpms.
For sure, definitely going to give that a shot before diving into the upper pan. Still waiting on the pump. Boss has me workin on other trucks in the meantime. Will be keeping everyone updated as I make more progress -
J
2009 LMM won't rev over 2k rpms.
Oh sure. I've done my share of upper pans and rear covers in this place. Stupid design -
J
2009 LMM won't rev over 2k rpms.
Insane. We were entertaining the idea of the crank being twisted since it ran and idled fine. Forget curveballs, you just threw a knuckleball out there for us to think about. Still waiting for the pump, suppose to get it tomorrow. If the pump doesnt do it, oil pans are comig down -
J
2009 LMM won't rev over 2k rpms.
Oh wow. Whenever we have snapped cranks, theyre no starts. The one you had wss idling and revving to the "limiter" no problem though? That's crazy, amd absolutley worth thinking about :thumb: -
J
2009 LMM won't rev over 2k rpms.
Of course boss wanted to see under the front cover. I felt it was a waste of time considering what the scope showed us, but whatever, I get paid by the hour. Bosses orders. Surprise, nothing bad under there. Timing on point, crank pins have no damage.......siggghhhhh.....this is very... -
J
2009 LMM won't rev over 2k rpms.
I haven't tried to burn it, but I doubt it would be different. This ****er does it even in park and neutral. Plus it's very "frowned upon" doing standing regens on 2009's in my shop, after 2 of them went up in flames in previous years lol And yes, I can command fuel pressure well above the... -
J
2009 LMM won't rev over 2k rpms.
Thanks, I plan on it. I'll be working on these things for at least another 10 years, and aside from the debacle this truck turned into, I actually have some decent knowledge and experience I can share myself lol -
J
2009 LMM won't rev over 2k rpms.
Exactly. I started tear down for the pump today. I'm going with my gut instincts and "back to basics" mentality and focusing on that fuel primer. I had the return from the pump clamped off at the pump the entire teardown until I got to fuel lines, and that plunger stayed rock solid the entire... -
J
2009 LMM won't rev over 2k rpms.
Haven't scoped any of them because I really haven't felt the need to. Everything looks kosher on Tech2 until it starts bouncing, then the maf and map start fluctiating but I chalk that up to the bucking, they read and behave normal until the limiter kicks in. Can't say I checked the LAN comms... -
J
Broken Crank?
What about the inspection plate under the trans? Pop that off then have someone crank it, and see if the torque co verter is spinning accordingly to the front half of the crank. If you see a difference, then you got a broken crank. -
J
2009 LMM won't rev over 2k rpms.
This is something I have not measured. I have the egr out but I don't think that should prevent me from being able to idle and measure that. I'll check it out, let you know -
J
2009 LMM won't rev over 2k rpms.
That's what my gut is telling me. I feel like a relief valve is fluttering under load. I pinched off the tank return line and I can still get the primer to harden that way, so I don't suspect a crack in a hardline on the engine side. It's really my only variable I can find in 2 weeks without... -
J
2009 LMM won't rev over 2k rpms.
No, it's a fleet vehicle, got a reman motor about 2yrs/20k ago. Looks like things like Turbo, Pump, Injectors, etc., were all swapped from old engine. Vehicle had no problems til about 2 months ago, then it started doing this "rev limiter" thing only durig a regen. Fast forward a month and... -
J
2009 LMM won't rev over 2k rpms.
The only code this lil bitch will give me is a CKP code SOMETIMES when I slam it into the limiter for a minute straight :mad: -
J
2009 LMM won't rev over 2k rpms.
I thought this too, and found trans fluid coming from the rear plug. The main harness has been replaced and I swapped in a good TCM, same thing. I thought possibly the internal harness had shorted and is maybe sending a signal to the ECM that a PTO is engaged, but nothing in the Tech2 would... -
J
2009 LMM won't rev over 2k rpms.
I agree with you, my gut says fuel pressure, but then the fact of it happening at 2000rpm on the button throws me off. Partial throttle, WOT, no indication of fueling issues, then 2k on the money bam, limiter. The desired hits 13k psi, then drops 1k-2k and comes back, lather rinse repeat, with... -
J
2009 LMM won't rev over 2k rpms.
This is my main concern personally also, and it is also the only anomaly outside of balance rates I have found on this truck wheb compared to another. AC Delco filter, brand new. I've also isolated the filter head by pinching off the return and output. Builds prime, hardens up and retains... -
J
2009 LMM won't rev over 2k rpms.
Hey guys, brand new here but not to forums. Searched high and low, all I find in relation to this is clear fuel pressure issues with codes to match. I don't have those problems, and I'm at my wits end, spinning in circles for 2 weeks now. I'll try to keep it as short as possible, any details you...