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why is my 1986 ford f150 backfiring?

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Old 06-18-2010, 05:00 AM
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why is my 1986 ford f150 backfiring?

My 1986 ford with 5.8 v8 windsor makes a backfiring noise when i rev up the engine and let off the gas. also when i drive down the road and accelerate fast and let of the gas sometimes it shoots like a gun. what can i check out that might be replace or adjusted. carb or some damn vaccum?
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Old 06-18-2010, 07:12 AM
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Carb or EFI?
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Old 06-18-2010, 10:39 AM
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It's running rich. Too much fuel is entering the exhaust system and is lighting off in the system causing the noise.
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Old 06-18-2010, 02:06 PM
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Check for exhaust leaks, any air entering the exhaust will help ignite any extra fuel. Check float level, power valve, idle mixture, etc. Check timing.
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