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Why does my 1971 Porsche 911 backfire on deceleration? What would help ??
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birth     Reply with quote
Would it help to run it with an 87 octane gas ? (currently l run it with premium 93).
The air-cooled engine has its original Webber carb's.
Underground     Reply with quote
Pretty much all older 911s do this. hell, theyre famous for it. My 930 belches like mad when l let off the gas, and l have a friend with one that shoots 18+'' flames out of his when on the track.

the crackling and popping is just classic porsche. And dont run it on 87.
Gerardo     Reply with quote
its very common on old porsches to do that, but if you wanted to fix that you would probably want a different exhuast system.
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