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o2 sensor
Posted by 85turbosled [Email] (more from 85turbosled) on Thu, 15 Dec 2011 22:37:14
In Reply to: Re: Only one car has a dashpot, and this happens even, Saabnutt, Thu, 15 Dec 2011 19:43:52
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the OP stated that it stars fine then after about two minutes the hunting starts.
I have a digital wideband hooked to my car, and after about three minutes the factory o2 sensor starts to affect mixture. During this time the sensor is still heating up, and I find that it reads slowly, and affects the idle mixture quite a lot more than it should causing some mixture 'overshooting'. This extreme leaning, then richening of the fuel mixture then makes the AIC valve overshoot to correct the idle speed, and hence the hunting.
replace o2 sensor, THEN using the aforementioned procedure adjust the AMM CO screw to achieve proper mixture. This should correct the problem. IF it does not, I would bet the AIC valve has a bad commutator, or is sticky in a certain spot
My 85' originally did this as well, and frankly a basic tune up corrected the problem easily. plugs, cap, rotor,o2 sensor, air filter and fuel filter are all important. once these items are known good, you can start to fiddle with the basic idle speed and AMM adjustments.
posted by 50.92.108...
Posts in this Thread:
- Cold idle hunting. '88t, is this really the AMM? I have, nicknick , Thu, 15 Dec 2011 18:11:26
- Re: Cold idle hunting. '88t, is this really the AMM? I have, CBS , Fri, 16 Dec 2011 13:52:17
- nicknick , it doesn't seem like you read my long ......, johnd, Fri, 16 Dec 2011 12:39:44
- to me it's more question about tools and knowledge, Siegfried, Sat, 17 Dec 2011 08:17:22
- Calibration test connector color code., Cmyles , Fri, 16 Dec 2011 14:05:23
- I'm sorry, i actually meant to have someone else, nicknick , Fri, 16 Dec 2011 13:14:29
- Thanks all. Obviously, i don't have access to a known, nicknick , Fri, 16 Dec 2011 09:01:06
- Hey Nick, been thru similar issues recently, nateh89spg , Fri, 16 Dec 2011 05:54:10
- How about, vvack0matic , Fri, 16 Dec 2011 03:19:18
- Re: Cold idle hunting. '88t, is this really the AMM? I have, JET AIR 900, Thu, 15 Dec 2011 23:12:37
- OK, that was confusing! It always starts fine. Only, nicknick , Thu, 15 Dec 2011 18:12:47
- Re: OK, that was confusing! It always starts fine. Only, vvack0matic , Thu, 15 Dec 2011 18:24:42
- Only one car has a dashpot, and this happens even, nicknick , Thu, 15 Dec 2011 18:49:59
- Re: Only one car has a dashpot, and this happens even, Saabnutt, Thu, 15 Dec 2011 19:43:52
- o2 sensor, 85turbosled, Thu, 15 Dec 2011 22:37:14 <-- Viewing This Message
- Re: Only one car has a dashpot, and this happens even, Hans, Thu, 15 Dec 2011 21:32:17
- What about the NTC sensor?, whitesaab, Thu, 15 Dec 2011 21:00:07
- Re: Only one car has a dashpot, and this happens even, Cmyles , Thu, 15 Dec 2011 20:57:08
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