Question about 2002 Pontiac Grand Prix

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2002 Pontiag Grand Prix GT 3.8 Runing rough and stalling at stops

2002 Pontiag Grand Prix GT 3.8 Runs rough with service engine light flashing at highway speeds, when you stop it stalls out and wont stay running unless you feather the throttle. Also the fuel gauge drops to empty and the low fuel light comes on even though it is not empty. The other day while driving the horn suddenly beeped once, and my hands were nowhere near the horn.

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  • David Gibbons
    David Gibbons May 14, 2009

    Put it on computer and got codes PO137, PO131, and PO300. EGR is brand new. 131, and 137 are low voltage on O2 sensors, and 300 is random misfire??

  • David Gibbons
    David Gibbons May 15, 2009

    Okay now I changed both O2 sensors, and then suddenly up comes a code for mass air flow sensor, I remove and clean and now there are no codes, and it wont stay running. I pulled the egr and it is wet inside, I had just put it on a couple of moths ago, when the cat went bad, and there was nothing wrong with the old one so I put that one on and it didn't change anything. Now it has no codes and wont stay running long enough to get any codes????????

  • David Gibbons
    David Gibbons Jul 04, 2009

    both O2 sensors and mass air flow sensor were the culprits.

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  • Pontiac Master
  • 14,036 Answers

Sound like vacuum leak or fuel pump problems.scan it to see if egr valve sticking open.

Posted on May 14, 2009

  • Jonah Oneal May 14, 2009

    code 137-circuit low input conditions .code 131-circuit low input conditions.code 300 is multiple engine misfire detected conditions.check all plugs and wires.and coils .what code 137 and 131 is telling you that you got a intake leak .do a cylinder leak down test that will tell you if intake leaking.

  • Jonah Oneal May 15, 2009

    remove egr valve clean carbon out the intake port where egr valve goes.use a piece of clothes rack wire.use chop vac to clean up pieces of carbon. besure to check pvc make sure its not stuck open.j

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