Alright, this one is starting to get the best of me. 2016 LML, 160k. Cracked a piston at 145k, put in fresh rebuild (Callies crank, mahle pistons, studs, cp3 swap). Everything was great for 6 months or so, then my head of construction who drives it came to me and said he thought the transmission was doing something weird. I didnt even bother to take it for a spin at the time, because it had a p0700 and I know the TCM's can be prone to fail around that mileage- so I just replaced the TCM with a new one.
That got me nowhere, so I drove it for a day and pretty quickly figured out its some kind of misfire that occurs only at 1100-1200 rpms. Does it in park, neutral, drive whatever... I checked all of the grounds on the truck seeing as the engine was swapped, found one loose one we forgot to tighten up on the drivers side of the engine block.. Fixed that, got no results. Have been told to search for harness rub through, so far I have not found anything at all. So I got pissed off and just wound up buying another truck for the company to keep us on the road.
The truck has sat for a month and a half or so, but we are getting busy and I need to get it back on the road now. Have had the following trouble codes pop up the last few times I have fired it up (p0673, p0675, p057c, p262b), then (p0673, p0675, p2771). These are all new to the truck.. The p262b is the one I am particularly concerned about. I have tried hooking up the V2 and shutting down each injector one at a time also- which didnt change anything at all.
It is getting to be where I am at a complete loss at this point. It surely seems electrical to me- but what do i know.. The injector balance rates go nuts when I sit and hold the truck at 1200 while it misfires (tried to attach video but couldnt, so there are screen shots of idle balance rates, then holding at 1200). So I figured I would post in here and see what yall think before I just completely say screw it and take it to a shop. Basically the only two thoughts I have left are to completely rip the wiring harness's off the engine to get a thorough inspection of them.. Or try a new ECM. I am open to trying anything, I just dont want to piss money away on things that wont help at all.
That got me nowhere, so I drove it for a day and pretty quickly figured out its some kind of misfire that occurs only at 1100-1200 rpms. Does it in park, neutral, drive whatever... I checked all of the grounds on the truck seeing as the engine was swapped, found one loose one we forgot to tighten up on the drivers side of the engine block.. Fixed that, got no results. Have been told to search for harness rub through, so far I have not found anything at all. So I got pissed off and just wound up buying another truck for the company to keep us on the road.
The truck has sat for a month and a half or so, but we are getting busy and I need to get it back on the road now. Have had the following trouble codes pop up the last few times I have fired it up (p0673, p0675, p057c, p262b), then (p0673, p0675, p2771). These are all new to the truck.. The p262b is the one I am particularly concerned about. I have tried hooking up the V2 and shutting down each injector one at a time also- which didnt change anything at all.
It is getting to be where I am at a complete loss at this point. It surely seems electrical to me- but what do i know.. The injector balance rates go nuts when I sit and hold the truck at 1200 while it misfires (tried to attach video but couldnt, so there are screen shots of idle balance rates, then holding at 1200). So I figured I would post in here and see what yall think before I just completely say screw it and take it to a shop. Basically the only two thoughts I have left are to completely rip the wiring harness's off the engine to get a thorough inspection of them.. Or try a new ECM. I am open to trying anything, I just dont want to piss money away on things that wont help at all.
