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Please Help me with Surging Problem
I have a 89 911 3.2.
500 miles ago had valves adjusted , new plugs and air filter changed . Car starts up cold or warm everytime . However In the last month after driving around 20 - 30 miles then stopping for about a half hour , the car surges at idle only . This lasts for about 30 seconds and then back to normal. If I race the engine it goes back to normal instantly . It does not surge all the time . If not for this the car runs strong . Help Please What are your thoughts Thanks , Vinnie from ventura 89 Silver Anniversary 911 Last edited by vincenza; 07-06-2005 at 09:10 AM.. |
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07-06-2005, 08:18 AM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Too rich or base idle set too high will make my 86 3.2 surge.
Joe |
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07-06-2005, 11:11 AM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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Yep, you can back out the bypass screw on the airflow meter to lean out the idle if that's the problem.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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07-06-2005, 11:13 AM
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Join Date: Jul 2002
Location: Southern California
Posts: 5,067
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Common problem. When I had it, Tyson and the guys at TRE dialed-in the mixture. It's been rock-solid ever since.
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1984 Targa |
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07-06-2005, 11:27 AM
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My Wrench is telling me that it might be my O2 sensor .
Any Thoughts on this one Thanks , Vinnie in Ventura |
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07-06-2005, 11:55 AM
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Location: Southern California
Posts: 5,067
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Before I had the mixture adjusted, I replaced the O2 sensor, the head temp sensor, and the idle control valve. Nothing helped until the mixture was adjusted. Sometimes the simplest solutions are the best.
But, if your car has more than 60k (?) on it, and the O2 sensor has not been replaced, it's not a bad idea to replace it anyway. It's a do-able DIY job. Our host sells the OEM sensor, and you can also buy a generic Bosch sensor and splice your old wiring harness on to it. I did the latter, and saved about $75 or $100.
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1984 Targa Last edited by scottb; 07-06-2005 at 12:04 PM.. |
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07-06-2005, 12:01 PM
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Join Date: Mar 2004
Location: S.E. Pennsylvania
Posts: 1,967
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Quote:
Could also be the ICV sticking a bit. I'd clean it out with some carb cleaner...Probably take you 10 minutes.
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The Fox Carrera |
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07-06-2005, 12:02 PM
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Thanks ,
love a ride in the Bell . My Partner in Business flies a 410 Cessna,( Real Sweet ) |
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07-06-2005, 12:03 PM
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Surging problem fixed .
Wrench told me to put in Redline gas treatment and drive . He was right, injector was dirty , cleaned out , runs great !! Vinnie in Ventura 89 Silver Anniversary 3.2 L |
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07-29-2005, 12:55 PM
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Join Date: Jan 2005
Location: Raleigh, NC
Posts: 49
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My 86 was having trouble at idle. I had a local wrench set the mixture. It didn't fix it.
I found (when I pulled the engine)that the #5 intake was loose enough that I could remove the bolts by hand. After I tightened those I have never had an idle problem again. The local wrench told me he checked that intake and it was tight. Thats why I will never trust this mechanic.
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86 911 coupe 2001 VW TDI |
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07-29-2005, 04:22 PM
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