1991 pontain grand am se 2.3l quad four
#1
07-25-08, 03:18 PM
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.
back firing, replaced crank postion sensor, 02 sensor, coil pack, and spark plugs. still backfires seems to be getting to much fuel.
#2
07-25-08, 05:38 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.
Restricted Exhaust, particularly a Catalyst that is clogged, will reduce the amount of vacuum available to the sensor, and hence , Disrupt the fuel curve.
#3
07-26-08, 03:26 AM
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.
#4
07-26-08, 08:15 AM
Originally Posted by bonjim
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.
back firing, replaced crank postion sensor, 02 sensor, coil pack, and spark plugs. still backfires seems to be getting to much fuel.
