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81SC Fast idle when cold - normal??
Sorry guys for dregging up an old topic but I need a sanity check. My '81SC starts, runs, and idles great but... On cold start is zips up to 2000 RPM and stays there for at least 5 minutes as the car warms up. Is this normal? Once warm, it idles smooth at about 1000 RPM. It did this during the warm months as well as cooler so it's not ambiant temperature related.
I've only had the car about 4 months and just assumed it was part of the warm up system with the CIS but I'm beginning to wonder if somethings not right. The warm up regulator was replaced by the previous owner. If this is not normal I'll probably start troubleshooting the CIS system. Based on some searches I'll probably take a look at the AAR first. mike |
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11-09-2007, 09:38 AM
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1800 ~ 2000 is good. You have the signs of a healthy CIS system.
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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11-09-2007, 09:50 AM
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Sleep Deprived and Grumpy
Join Date: Jun 2003
Location: Lake Geneva
Posts: 1,575
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I would agree that is normal. Same thing on my 82SC.
JW |
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11-09-2007, 10:02 AM
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Join Date: Feb 2002
Location: Maple Ridge, BC, Canada
Posts: 984
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If you want to bring the cold idle down a bit, do a search on how to tweak the AAR (aux air reg). It's an easy job.
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Al Shkuratoff 86 Carrera, SW chip, Fabspeed, M&K 83SC Platinum - Sold 83SC Slate Grey - Sold |
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11-09-2007, 11:58 AM
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1985.5 Porsche 944 2.5L Supercharged 
911 SC
Panamera
