the PCM is the one that came with the motor/trans., from an 02 camaro. it has a Nelson tune. funny thing is the check engine light, LED on the Nelson harness, doesn't come on either. i unplug the MAF to see if it would throw a code & no light, but when we plugged in the code reader there was a code for the MAF. not sure if that would be in the harness or ECU/PCM.
driver side plugs are completely covered in a dry black carbon. cleaned them up, put them back in & drove around the block. still running bad & in the short drive the plugs are covered again. like the driver side coils aren't getting the right signal or something. i'm going to switch the coils from the driver side to pass. side & see what happens. i don't think it will change but i don't know what else to do until i find a scan tool. someone also told me the Nelson harness won't communicate with Snap-On or Mac scanners. anyone else heard of this?
is there any exhaust leak prior to the o2 sensor? that would cause it to run pig rich on that bank...also how does it run with at WOT?
2008 GMC Sierra SLE....370ci LY6 with some goodiesSOLD
1995 C2500- LS1 swap with a mp112
build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html
i think it does have a small leak where the header meets the head. the allen head bolts that came with the headers aren't worth a crap.
in park WOT she runs fine. once i put it in gear & drive down the block it starts to run rough, sputtering & missing.
the exhaust leak will cause it to run rich becuase the o2 sensor reads it as being lean when its really not and dumps the fuel to it...At WOT it will run fine becuase the pcm doesnt use the o2 sensors for fueling at WOT. Unplug both o2 sensors and see how it runs then....it should stay in open loop and run fine if im guessing correctly
2008 GMC Sierra SLE....370ci LY6 with some goodies
1995 C2500- LS1 swap with a mp112
build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html
found the problem. 2 of the wires on the harness going to the drivers side O2 sensor were crossed. swapped them around & everything looks good on the scan tool. hopefully i'll have some time this evening to go test drive it.
Awesome! Congrats bro hope it screams! How do I go about ordering one if your bad ass hats?
ahh i knew it was something to do with the o2 sensor
2008 GMC Sierra SLE....370ci LY6 with some goodies
1995 C2500- LS1 swap with a mp112
build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html
yea, my friend came over with his mac daddy scan tool. we could see the driver side was acting crazy. swapped the O2's around & it was doing the same thing. he was checking the O2 plugs & we noticed the wires were in different locations. swapped the driver side to match the passenger side & everything looked great on the scan tool. i'm off to a field trip with my daughter right now but hopefully i'll be roasting some tires this evening!!!!
LMK what you want & we can go from there.Originally Posted by jansen
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