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Registered
Join Date: Apr 2004
Posts: 688
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Valve issue or carb related?
A couple months ago I purchased a '75 911 targa. It has had the CIS removed and a set of weber 40's installed somewhere in its life time. I have put about 1,000 miles on it- and recently it has started backfiring or "popping" out of the carbs at low rpms like when taking off from a start. Could this be clogged jet?
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04-05-2015, 07:16 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Most likely a clogged idle jet. If the car hasn't been driven much lately, there could be debris or gas residue in the system causing the clogging.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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04-05-2015, 07:56 PM
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Registered User
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Quote:
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1976 911S MidYear Fever is alive and well. |
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04-05-2015, 08:04 PM
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Registered
Join Date: Feb 2008
Posts: 1,438
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Clogged idle jet most likely as per above. See "Sources of Debris in Float Wells" on my web page:
Performance Oriented
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Paul Abbott Weber service specialist www.PerformanceOriented.com |
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04-05-2015, 10:06 PM
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My Garage
1971 Porsche 911
Baja Bug
1976 Porsche 911S
