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What would make a 1991 Pontiac Grand Am cough and sputter backfire up the carbarator?
Wiki User
∙ 17y ago
There could be many causes, but the first that comes to mind is that the timing [between the pistons/valves and distributor] has "jumped or slipped," causing the the fuel mixture to be ignited by the sparkplugs, WHILE the intake valves are still open.j3h.
Wiki User
∙ 17y ago
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Why is your 2001 Pontiac grand am se backfiring could it be something with the coil pack?
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