Backfire on Deceleration

My truck runs good until i take my foot off the accelerator which provokes many popps or backfire. Am i running lean, rich, or is it because of something else?



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See if your exhaust is sucking in cold air in the manifold.



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it usually means your running lean vaccuum leak i used to remove the vacuum line from the distributor on my chevy to make it do that



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Hey, it worked on the Fords too. It sure would make them glasspacks "crack"!.



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you have a vaccum leak in either the intake or exaust manifold



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thats right...we spent serious money (mostly fines) in order to get that sound..



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all this about vacume leaks is very unlikely. it is usaly the deverter valve. block off the hse going to the exhaust and if it stops back firing then replace that deverter valve. some trucks have one for each side of the exhaust( v8's)



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