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hipdoc's Avatar
 
Join Date: Sep 2007
Location: Fresno, CA
Posts: 156
930 idle flucuate

help, my 1979 930 will start fine when cold, idle high initially but then when the idle comes down it will flucuate (oscillate) up and down 500-2000 rpm for 4-5 times before idling steady around 900 rpm. It has an MSD ignition, K2700 turbo, and GHL muffler. What could cause it to do this? Auxcillary valve? hipdoc
Old 02-29-2008, 06:50 PM
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Acceleration Junkie
 
Join Date: Aug 2007
Location: Laguna Beach, CA
Posts: 263
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It's either too lean or too rich. Idle fuel mixture screw is a 5mm hex under a 5mm hex cap plug just to the right of the fuel plate, left of the fuel distributor.
A 1/4 turn one way or the other will likely resolve your issue. Engine won't run well with hex cap off. Plug the hole with your finger to verify idle. Rev it a bit, see if it settles properly.
This said, if the condition only exists upon cold start then idle settles in and behaves after the engine is somewhat warm, probably a WUR issue.
Old 02-29-2008, 07:23 PM
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Join Date: Jan 2007
Location: Inland Empire of the left coast
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Hip Doc, Welcome!

Drive the car to a smog station and tell the folks you want to adjust your fuel mixture (AFR) using there CO sniffer. Take a 3 MM allen wrench with you. Next Unplug your O2 sensor (this is a must) if you have one. I'm not sure if 1979 had the Lamda system??? Either way adjust you mixture to about 2-3 on the CO meter. Your car should run fine. If not you need to have your fuel pressure checked.

My 2 cents

Bob
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Old 03-01-2008, 01:45 PM
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It's running a little rich.
Turn the 3mm allen head CO adjustment screw counter clockwise or to the left about a quarter turn then turn it back clockwise till it idles smooth and stable.
Takes some practice but you'll be closer than now.

The final turn should be to the right to keep that setting.

Turn left for lean, right for rich on the CO adjustment.
Old 03-02-2008, 10:37 AM
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No lambda on 79's..Open system
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Old 03-04-2008, 05:14 PM
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