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Registered
Join Date: Sep 2004
Location: Merced ca.
Posts: 143
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hot restart idle problem
its 110* deg today. After a short visit at work i restarted my 82 sc 3.0 an the idle would go from 100 rpm's to 1,200 rpm's! this lasted for about two minutes then it was back to normal stop idle speeds (850rpm).
cold starts are perfect, but once it gets some heat i have a problem. reminds me of vapor lock in some ways.???? |
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06-25-2006, 02:36 PM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Did this happen just this one time?
Have you checked your control pressures?
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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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06-26-2006, 07:04 AM
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I have the same problem, I don't have a solution but I can tell that on mine when this is happening the mnixture is down in the negative numbers, like -0.4 on my gas tester. If you rich it up to say .8 .9 it's fine again, however the base mixture is now messed up.
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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06-26-2006, 07:31 AM
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Join Date: Sep 2004
Location: Merced ca.
Posts: 143
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Scott, thats what i have done also. i know that theres a problem somewhere and i hate bandaids.
Paul, this has happend several times before, but only when its quite hot out. once past the two minute or so the car runs great! i had my cis checked by a very well know p-car shop. they reported no problem with the settings or pressures. |
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06-26-2006, 08:13 AM
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Quote:
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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06-26-2006, 08:19 AM
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rich mixture will cause a hunting idle. on a 110 degree day, the air is particularly 'thin' and artificially cause a rich mixture. bet it doesn't do this on a cool day. how old is your o2 sensor?
ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008 www.friendsofwarren.com 1990 964 C4 Cabriolet (current) 1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold) |
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06-26-2006, 09:36 AM
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Registered
Join Date: Sep 2004
Location: Merced ca.
Posts: 143
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Ryan, your right about the cool/cold daze. its just the VERY hot days that give me this problem. seems to me that if everything was working properly, the car would adjust for warm and cold conditions and this problem would not happen. the o2 sensor is 2 years old and it was (oem bosch) not a cheep one.
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06-26-2006, 09:44 AM
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I'll also add that I just replaced my fuel pump and acumulator per my mechanics suggestion to try and resolve this, however the problem persists. My p-car wrench tried to adjust things up to correct this, but no luck.
I have a goofy theory that my CIS-K computer gets hot and some of the solder traces work loose and start cause issues. However with no diag port I can't find a way to diagnose it.
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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06-26-2006, 09:47 AM
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yeah, you shouldn't have to 'manually' adjust your mixture on hot hot days..it does sound mixture-related for sure, with some component of your fuel injection system not compensating properly.
ryan
__________________
To the memory of Warren Hall (Early S Man), 1950 - 2008 www.friendsofwarren.com 1990 964 C4 Cabriolet (current) 1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold) |
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06-26-2006, 09:48 AM
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1985.5 Porsche 944 2.5L Supercharged 
911 SC
Panamera
1974 Porsche 911 2.7
