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Vaccinated and Boosted
Join Date: Mar 2007
Location: Ohio
Posts: 1,588
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another idle surg problem
Hello All,
I have an 83 SC. When cold start up the car warms up and finds its proper 900 rpm idle. IT runs and drives fine. Then if I stop, and then a few minutes latter, start it back up, it will not idle. It will surge from stall to 1300 rpms and will continue to do this until I run it for awhile apparently until I get it hot again. Then it is OK again. I have searched and found many many threads but I really cant seem to match my problem. Many threads suggest adjusting the mixture screw...but I do not know where it is. Can someone point me in the right direction??? Thanks!!!!!! mg |
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06-30-2008, 08:19 AM
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Registered
Join Date: Oct 1999
Posts: 8,673
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SURGE?
It's not recommended to adjust the mixture without a gas analyzer - should be a pretty minimal charge at you porsche mechanic. Too lean can damage the engine severely. If it runs fine until/unless you stop it and restart, it may not be mixture. |
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06-30-2008, 08:34 AM
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RETIRED
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Well the mixture screw really shouldn't be screwed with.....pardon the pun....without a gas analyzer hooked up. See the thread where the guy tried to richen it up and ended up doing the opposite and cooking the motor.
The adjustment requires a long allen wrench and is accessed under the air box. Your problem sounds like a classic "lean idle hunt".....typical of a CHT problem.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel Last edited by Joe Bob; 06-30-2008 at 08:42 AM.. Reason: EDIT:....tcar beat me to it....went to get a cuppa coffee. |
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06-30-2008, 08:41 AM
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Registered
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Mine is doing the same thing.
It starts great (idle is high) but after I drive for a bit, then re-start it. It hunts and then dies. It will re-start greatbut continue to hunt (I have to keep my foot on the gas and idle high in order to keep it running) I was thinking fuel filter?
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Shawn 77 Targa with 2.7 My never-ending work in progress that has been off the road since Mar 2004 
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07-03-2008, 09:20 PM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Usually a hunting is the result of a mixture that is too rich. Anyone not familiar or comfortable w/ the procedure should get someone w/ a gas analyzer to set the mixture. They should also have control pressures checked to see if it is a WUR problem or simply an incorrect mix setting.
As an alternative you can search Souk and his field test for setting mixture.
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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07-04-2008, 04:19 AM
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Da cab
