Question about 1997 Pontiac Grand Prix

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Stalls 2 different mechanics have tried to fix this problem. The car will shut down at various times - any speed from idling at stoplight to driving 60 MPH. It will restart every time, usually on first time. If not right away, then after a minute or 2 it will restart. The EGR and mass airflow sensors have been replaced and a short circuit repaired. The check engine light had been on until the short was repaired. The light is out, but the car still stalls intermittently. Thanks

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The problem might be b'cos of wiring.wiring issues may be intermittent, though. Clean the connectors at the AMM (3-2-2) or the Cold Start Injector (3-2-1), slather them up with dielectric grease (easily available at auto parts stores, excludes water and grunge, resists corrosion) and reassemble. Inspect insulations as well as possible. Clear the codes and try again.

Posted on Sep 09, 2008

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Hi,

I am assuming the problem is electrical in nature. Fuel, absence or starvation, would be gradual and would not be a sudden shutdown. Having said that (electrical), then it could be:

  • sudden cutoff of the IGN B+12 to the ignition module, the ECM/ECU;
  • sudden cutoff of sensors/triggers feeding the ECU/ECM.
The common denominator for all of the above would be the connectors. Pls check/clean the connectors leading to or from the above mentioned components.

In some instances, it could be the alarm/security or immobilizer of the vehicle acting up, that is of course if the car has one.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 09, 2008

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Get the fuel pump and the fuel injector checked.

Posted on Sep 09, 2008

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