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Pulsating Engine Idle???
My 79 911 SC has a certain pulsating (Slight rise and fall in RPM) at idle. Seems to run fine once at operating tempature.. It has a 3.0 with modifided cams, pistons, exhaust, etc., etc.
Any thoughts? Thanks, Alex in NJ |
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09-09-2003, 05:26 PM
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Crotchety Old Bastard
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Was the CIS retained after all the mods? If so how old is the system?
The issue is most likely fuel metering. CIS is not compatable with most cam or piston upgrades. Old or worn metering plates may be out of tolerance for adjustment as well. Carbs also have issues when cold due to a temporary lean condition.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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09-09-2003, 06:28 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Gout is what people get on a rich diet. A fluctuating idle is what engines get on the same diet.
Joe |
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09-10-2003, 01:17 PM
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Registered
Join Date: May 2002
Location: Portland, OR
Posts: 363
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Get the mixture adjusted and go from there. Chances are there's nothing wrong.
Doug 75 911S |
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09-10-2003, 02:03 PM
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1979 Porsche 911 SC 3.0 
78 Porsche 911SC 3.0L, 3.3Turbo soon. 
