New to the group so hope this hasn't been talked to death.
Recently inherited this car and the check engine light is on and has been for several yrs but dad would never have it checked out.
Engine codes say the problem is engine is running lean on both banks. No other codes showing up. Engine seems to run OK except sometimes I notice a slight hesitation when taking off from a stop sign. This is a new engine for me so not too sure where to begin. My thought is with both banks reporting same condition it is unlikely a bad injector. Most likely problem has to do with sensor/component shared by both banks.
My thoughts are:
- Could it be engine is running OK but some subsystem isn't working up to spec?
- O2 sensor working well enough to not be reported as a problem but may be reporting engine is running rich so computer is leaning out.
- Low fuel pressure on the fuel rail. Gage reading is low 30's and I'm thinking it should be closer to 40 PSI. At this point not sure how accurate gage is. Disconnecting the vac hose on the pressure reg does raise the pressure 6-8 PSI.
- Possibly either throttle position sensor or MAP/air flow sensor not working up to spec.
Anyone got a bone to throw me as to possible cause? If I get this resolved, is there an easy way to reset the computer other than disconnect the battery?
TIA
Mickey