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1990 Pontiac Grand Am LE 2.5L Misfire, Back fire
Posted to GM Driveability on 2/27/2009 12 Replies

This car only seems to act up when the ambiant temp is close to 80 or higher. Car will backfire on acceleration and seems to misfire on accel sometimes. Customer states problem started after getting fuel but fuel sampple looks and smells good. We decarboned en...

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car Vehicle Data

1990 Pontiac Grand Am LE

VIN 1G2NE14U5L
Engine2.5 L / 4 cyl / GAS
Trans3-speed Automatic
DeliveryFI / TBI
EmissionsOBD1 US Fed emission
SymptomsMisfire, Back Fire
OccursHot, Under Load, on Accel, After a Hot Soak
Message Closed w/FIX

car Vehicle Data

1990 Pontiac Grand Am LE

VIN 1G2NE14U5L
Engine2.5 L / 4 cyl / GAS
Trans3-speed Automatic
DeliveryFI / TBI
EmissionsOBD1 US Fed emission
SymptomsMisfire, Back Fire
OccursHot, Under Load, on Accel, After a Hot Soak