Guys,

Just got the car back together and running. The last time I drove it, it would go very rich (peg the wideband at 10.0), and spit/sputter/stall, eventually clear up, and randomly repeat.

Boost leak check was fine, no problems with the IAC, wiring looks good, etc. I was able to reproduce the problem by disconnecting one of the connectors to the COP (thus killing 2 coils).

I also put my friends stock igniton on the car, and it did not show any symptoms of the problem.

I ordered new coils for the COP, will replace the plugs and do a thourgh wiring harness inspection. Just curious if anyone could think of anything else to check? I logged it while it was doing it, and everything looked 'fine' on the log (meaning the TPS/timing/etc was not going haywire during the rich parts).

Thanks
Travis

 

Sounds like the short term fuel trim is resetting. This happens when it maxes out. Log it. If it goes to -20 or more then you have an issue or need a tune.