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RobMc
Mentor
Joined: 23 Nov 2006
Posts: 4639
Location: Yonkers - New York |
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 Why does my 1971 Porsche 911 backfire on deceleration? What |
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Why does my 1971 Porsche 911 backfire on deceleration? What could help ?
Would it help to run it with an 87 octane gas ? now I run it with premium 93 .
The air cooled engine has its original Webber carb's.
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| Wed Oct 03, 2007 7:41 pm |
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IlloderEr
Mentor
Joined: 24 Nov 2006
Posts: 4568
Location: Rochester, New York, usa |
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| Why does my 1971 Porsche 911 backfire on deceleration? What |
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Pretty much all older 911s do this. hell, they are famous for it. My 930 belches like mad when I let off the gas, and I have a friend with one that shoots 18+" flames out of his when on the track.
the crunching and popping is just classic porsche. And don't run it on 87.
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| Wed Oct 03, 2007 7:41 pm |
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RobMc
Mentor
Joined: 23 Nov 2006
Posts: 4639
Location: Yonkers - New York |
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| Why does my 1971 Porsche 911 backfire on deceleration? What |
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996 GT2 and 930 turbo owner, PCA member and racer.
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| Wed Oct 03, 2007 7:41 pm |
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Fastride
Mentor
Joined: 20 Sep 2006
Posts: 4684
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| Why does my 1971 Porsche 911 backfire on deceleration? What |
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its common on old porsches to do that, but if you wanted to fix that you could most likely want a different exhuast system.
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| Wed Oct 03, 2007 7:41 pm |
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