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1998 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on
Posted to GM Driveability on 2/18/2006 11 Replies

Engine looses power when supercharger boost comes in. Feels like loss of fuel. Both O2 sensors read the same. No misfire in cyllinders #2 and #6. #4 and #5 miss the worst. Runs perfect unless under load. New spark plugs, fuel filter, air filter. P0300, multipl...

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car Vehicle Data

1998 Pontiac Grand Prix GTP

VIN 1G2WP5216W
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsMisfire, MIL Lamp On
OccursUnder Load, on Accel

Trouble Codes

P0300Multiple Misfire Detected
Message Closed

car Vehicle Data

1998 Pontiac Grand Prix GTP

VIN 1G2WP5216W
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsMisfire, MIL Lamp On
OccursUnder Load, on Accel

Trouble Codes

P0300Multiple Misfire Detected