Hello there I just picked up a 2002 Grand AM SE 2.2 Ltr Engine, the check engine light has come on several times and I have sttempted to fix the problems. the codes that cam up were P0300 (Random/Multiple Cylinder Misfire), P0507 (Idle Control System RPM High), with these 2 issues I changed the spark plugs and replaced the Idle Air Control Sensor/motor) Then the second time the check engine light came on it showed a code of P0171 (System to lean (Bank 1)) with this issue I replacd the Oxygen Sensor, before the Cat. I have not gotten the check engine light yet but the car is still acting like the is ideling higher then normal, and the car motor surges at times. does anyone have any recommendations. Thanks Kris
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when you see a code it does not identify parts failure only the system with an issue. you need to look at freeze frmae date to see the readings at the time of the failure and then look for the issue. your varying idle does not mean your iac was bad. the motor was trying to adjut the idle and was unable to do so. the 171 is a lean code, not an o2 code.I think you need some advice from a shop tech who can diag your car and give you the answers your looking for.
Roy
