Question about 1996 Pontiac Grand Am

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1996 grand am 3.1 auto. start the engine and the motor pulses usually to the point that it stalls. put the car in gear, D or R and the car stays running. runs rich but stays running. can see black from tail pipe. have checked wiring and vacuum lines. has new plugs. still dont know how to fix the problem

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  • smngspxl Sep 11, 2010

    i replaced the egr valve, mass air flow, throttle position, and another sesor on the throttle body. even disconnected the temperature sending unit.car runs great cold. as soon as it reaches proper temp, it starts reving up and down until it will eventually stall. place car in geer and it will smooth out and stay running. runs really rich. if you disconnect either the mass air flow or one of the two sensors on the throttle bady it smooths out and will idle. but really rich. burning $20 in fuel in 40 km.

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Egr valve is bad and its not cheap about 200$

Posted on Sep 05, 2010

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