I have a 1979 F150 4x4 351m 2 barrel carb, the question i have is: what would cause my truck to backfire thru the exhaust when i let off the gas, it was great when im doin 65-70 mph as i let off the gas it backfires, i see flame coming out, any ideas ?

Asked by Keith Aug 29, 2017 at 08:18 PM about the 1979 Ford F-150

Question type: Car Customization

2 Answers

10

Just the opposite described not too rice, It is too lean ! Use gumout carburator cleaner with red tube nozzle , fill the bowl by shooting spay in through the vent. several attempts may loosen low speed jet clogged particulate as well as main jet particulate I have found this too rectify back firering when decelerating or downshift/deceleration

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An exhaust leak can cause backfires. Air sucked into the exhaust can burn excess gasoline.

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