underhood

Asked by Feb 07, 2009 at 08:41 PM about the 1991 Pontiac Grand Prix

Question type: Maintenance & Repair

when engine warms up rpm runs hi and low turn lights on car quits

1 Answer

1,475

Check the alternator first. If the car stalls when the lights are turned on with a warm engine, that is likely due to loss of voltage at the computer. Check and see if the alternator stops charging when it gets hot. It is not uncommon for alternators to fail on these cars, and alternator failure can cause numerous driveability issues.

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