My 1987 Pontiac Grand Am with the 2.5 liter four cylinder engine tends to back fire into the throttle body. It only happens every once in awhile when you put a load on the engine. What could be wrong?
by 
Tommy6
ANSWERS: 2
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Could be a dirty fuel injector. when is the last time you bought a bottle of fuel injector cleaner? fuel injectors become clogged, just like everything else in an automobile. under a heavy load, one injector is not perfoming normally. then, all of a sudden, its unclogged and a build-up gasoline causes what sounds like a backfire. autozone has fuel injector cleaner, at a reasonable price. hope this works for you.
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i just solved the same problem on my 1988 pont grand am 2.5 the 2.5 has a control modual under the coil packs in the back of the engine .take out the 3 bolth halding it and the modual, coil packs and crank sensor all come out togather. have then tested at your parts store one or more of the three is breaking down.aprox cost of mod. about 90.00 coil packs about 25.00 ea i replaced all 3 problem solved
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