Question about 1999 Oldsmobile Alero
Going into weeks now on this problem car. 1999 alero 2.4 with surging after engine warms up. Idle drops down, engine starts surging. Have changed [partial list] fuel pump, fuel filter, pressure regulator, fuel injectors, fuel pressure test shows 48 bls key on engine off, 48 lbs running. pinch off return line pressure goes to 85 engine idle smoothes out for approximately 1 seconds. appears to be lean condition have checked for vacuum leaks extensivly. any ideas at all, appreciated.
Most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.
Posted on Feb 26, 2009
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Posted on Jan 02, 2017
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