1991 pontain grand am se 2.3l quad four

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Old 07-25-08, 04:18 PM
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1991 pontain grand am se 2.3l quad four

1991 pontiac grand am se 2.3l quad four
back firing, replaced crank postion sensor, 02 sensor, coil pack, and spark plugs. still backfires seems to be getting to much fuel.
 
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Old 07-25-08, 06:38 PM
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Backfire is usually a result of LEAN FUEL. Look at the front top of the engine and make sure the MAP sensor hose is in place.

Restricted Exhaust, particularly a Catalyst that is clogged, will reduce the amount of vacuum available to the sensor, and hence , Disrupt the fuel curve.
 
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Old 07-26-08, 04:26 AM
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Not sure but I seem to remember something about timing/camshaft belts on these engines being a common problem in the past. Perhaps a check in that area will hopefully eliminate that as a possibility. Just a thought.
 
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Old 07-26-08, 09:15 AM
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Originally Posted by bonjim View Post
1991 pontiac grand am se 2.3l quad four
back firing, replaced crank postion sensor, 02 sensor, coil pack, and spark plugs. still backfires seems to be getting to much fuel.
But did you check/replace the coil TOWER?????..........The big plastic piece the coils sit in?????............Carbon tracking/cracks can cause the engine to run like a car with a cracked distributer cap...........
 
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