When I go to start my 2002 grand prix 3800 series 2 it doesn't stay running on first start without revving up the RPM's. I hooked up to a code reader, came up with both O2 censors and a MAC

Asked by Jan 04, 2015 at 03:22 AM about the 2002 Pontiac Grand Prix GT

Question type: Maintenance & Repair

MAC= mass air censor
I changed all 3 and still runnin the same.

2 Answers


Try tapping on the EGR valve with the handle end of a screwdriver. It may be stuck open. That'll cause a no idle condition. If that straightens out the problem, replace the EGR valve. I've had issues with the one on my '00 Grand Prix GT Coupe. Also check the IAC (Idle Air Control) valve on the throttle body. It may be stuck closed. While you're there clean the throttle body and throttle plates with a spray can of carb and choke cleaner. All parts in there should be clean and shiny. BTW, MAF is the abbreviation for Mass Air Flow Sensor. HTH. -Jim

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I agree

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