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Unread 03-29-2011   #1 (permalink)
vjwoodrepo is offline Rookie


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Default 1991 mustang gt backfiring threw intake

hey guys i have a 1991 mustang gt that has been having issues. when i start it up it doesnt want to stay running. It sounds like there is a major vaccum leak but theres not. and its sucking major air through the maf. when i try to keep it running that is when it pops. i have already replaced the tps and maf. could it be the o2 censors? thanks jake
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Unread 03-29-2011   #2 (permalink)
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Did this just happen as in instantly? If so I would check the timing and see if its still on, the chain could have jumped if the mileage is high. I ow on some carbed engines if the floats went out, they tended to dump too much fuel into the intake causing huge fire balls and popping noises to come out of the carb.
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Unread 03-29-2011   #3 (permalink)
My 5.0 91 LX is offline Made Member

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usually if it backfires through the intake its fuel or air, if its through the exhaust its the timing. check your maf again, is it wet or dirty?do you have cai? and did you just clean and oil the air filter, could of gotten some oil on the wires in the maf
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91 LX 5.0 HO , BBK SSI intake,MSD Pro Billet dist.,BBK adj.fpr, 75mm tb.73mm mas,BBK cai, Trick Flow underdrive pullies, 19lb injectors, 2 1/2" exhaust, BBK headers, x pipe, & converters, magnaflow cat back, Aod with TCI streetfighter valve body
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