C.E.L. On dash, koeo pass, koer pass, cmdtc p0171. Removed mass air flow sensor and clean it. Cleared dtc, monitor PIDS- SHORT fuel trim +-3%, long fuel trim goes +25-%, when engine started at idle. Replace heated 02 sensor, rechk fuel trim at idle, long term still at +25, even after dtc is reset( reset with scanner). Short term still normal. Smoke intake and exhaust system, no leaks found. Oh forgot to mention, fuel pump new also. Car has no drive concern, just c.E.L. Comes back on, will not complete all readiness test. Clean throttle body out and flush out injectors( disabled fuel pump and add cleaner to fuel rail line and run car with cleaner). With engine running and monitoring PIDS-02 sensors, short fuel trim and long fuel trim, used brake cleaner and propane trying to find possible small intake leaks, no leaks found. Removed mass air flow sensor, ohm check sensor okay, 2.6 ohm (outside temp about 60 degrees ). Mass air flow sensor pids state getting 2.20 air flow at idle, is that about right? Running out of options on this car.
have the same problem?
Wednesday, January 4th, 2012 AT 5:27 AM