 912e mild backfire on deceleration |
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| rosenfe |
 Dec 7 2014, 06:19 PM
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#1
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Senior Member  Group: Members Posts: 564 Joined: 14-October 13 From: northern california Member No.: 16,512 Region Association: None  |
when i accelerate and take foot off gas ,i get backfire sound -or similar to that.its not loud,but noticeable.any ideas of what to check.these cars have backfire valve,but im not sure how that works.car runs strong,just adjusted valves.someone on 912e forum suggested exhaust system gaskets,but im not sure if they were referring to gasket at headers or muffler.any ideas?
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| dknechtly |
Dec 8 2014, 09:29 AM
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Yellow 914 Group: Members Posts: 68 Joined: 11-April 03 From: Wylie, TX Member No.: 560 Region Association: None |
If you have a two nipple vacuum advance, check that it is good. One of them helps pull back on deceleration.
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| stownsen914 |
Dec 8 2014, 10:45 AM
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#3
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Senior Member Group: Members Posts: 957 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
Or you already have a burned valve (or not seating properly). The exact symptom I had years ago on my 914 2.0. When I pulled it apart there was a burned valve ...
Check the exhaust leaks first obviously since that's external. You'll hear different methods for doing this, but my favorite is probing around with a length of fuel hose (or other similar sized hose), one end near (but not too near!) your ear, and the other probing around where you think there may be leaks. You'll hear a very audible poofing sound through the hose when you get near a leak. Scott |
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Posts in this topic
rosenfe 912e mild backfire on deceleration Dec 7 2014, 06:19 PM
rick 918-S Is it back firing or popping from an exhaust leak? Dec 7 2014, 06:29 PM Mikey914 Exhaust leak Dec 7 2014, 06:30 PM rosenfe well the responses suggest exhaust leak.any sugges... Dec 7 2014, 06:41 PM
pisces914
well the responses suggest exhaust leak.any sugge... Dec 7 2014, 07:01 PM rosenfe more of a popping sound,can i continue to drive it... Dec 7 2014, 06:44 PM patssle Look for carbon blowout - any darkened areas aroun... Dec 7 2014, 07:19 PM roblav1 Yup... exhaust leak. Dec 7 2014, 07:49 PM rosenfe noise had gotten louder after adjusting valves.the... Dec 8 2014, 11:53 AM rosenfe would a bad deceleration valve cause this problem? Dec 8 2014, 12:43 PM |
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