I could use some advice.
2001 Pontiac Montana 3.4L van needs diagnostic. High mileage.
Running very badly, any rpm, misfire, weak, maybe worse when warm.
Acts exactly the same when in open loop. (disconnect O2)
P0300 Random Misfire (blinking), no other codes.
Fuel trim is heavily negative
Motor running warm due to lean pcm
Was not burning oil and cooling system is clean and solid. Lower intake gasket project was done last year.
I have replaced front O2 - no result.
I have recently replaced fuel pres reg as it had failed.
I checked IAC for the heck of it.
I think all injectors are operating correctly and fuel delivery seems to be correct but I have not pressure tested fuel line for lack of meter.
Just feels like there is no ignition for half of the motor, so the pcm sees rich.
Could it be ignition module and/or coil pack?
Vehicle is from North East, so corrosion could be an issue.
2001 Pontiac Montana 3.4L van needs diagnostic. High mileage.
Running very badly, any rpm, misfire, weak, maybe worse when warm.
Acts exactly the same when in open loop. (disconnect O2)
P0300 Random Misfire (blinking), no other codes.
Fuel trim is heavily negative
Motor running warm due to lean pcm
Was not burning oil and cooling system is clean and solid. Lower intake gasket project was done last year.
I have replaced front O2 - no result.
I have recently replaced fuel pres reg as it had failed.
I checked IAC for the heck of it.
I think all injectors are operating correctly and fuel delivery seems to be correct but I have not pressure tested fuel line for lack of meter.
Just feels like there is no ignition for half of the motor, so the pcm sees rich.
Could it be ignition module and/or coil pack?
Vehicle is from North East, so corrosion could be an issue.
