okay, this is what has been done so far in an attempt to resolve the DTC Error Code P0171:
replaced the MAF(Air Mass Meter)
ran a fuel pressure test inline and got these readings:
36psi with ignition on but not started
38-39psi with engine running
- plugged the fuel return line and the pressure jumped up past 60psi
which the book recommends replacing the fuel regulator but i already did with a used one unless the second one is also bad.
- noticed when relieving the fuel pressure by removing the gas cap, no pressure release sound was heard like all the other vehicles ive ever removed the gas cap from. does that indicate a faulty fuel system?
- don't know if this problem is related, but when turning the ignition switch on there is a high-pitched wheezing noise coming from the Throttle Control Module located on the side of the throttle body.
already disconnected the battery to reset the ECU, but after the car warmed up the error came back again. any suggestions in getting rid of the DTC P0171 error code?
other than the error code, the car runs great!
Modified by icekooled at 8:35 PM 11-30-2007