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surging idle with a/c on?

Old 09-14-2005, 10:59 AM
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surging idle with a/c on?

Hey guys got a issue with my 91 toyota truck 22re. When i turn on the a/c it will occasionally at a stoplight start surging idle wise. It seems to surge at least 300-400 rpm and then stop after about 20-30 seconds. Only happens when the a/c is on. You can definetly feel it inside the cab but not too bad. A/C blows ice cold though. What could be the problem and how can i fix it? thanks!

Last edited by 91RN81; 09-14-2005 at 11:00 AM.
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Old 09-14-2005, 11:30 AM
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the AC idle up valve needs to be adjusted. check out
www.4crawler.com for the causes and corrections. or you can PM him.I woulld try yo explain right not now but I'm not sre how long I will have power.......
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Old 09-14-2005, 07:08 PM
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I dont see any information about this on 4crawler.com??
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Old 09-15-2005, 02:57 PM
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Sorry about that. I had sporatic power yesterday.
The AC idle up valve is located on the intake plenum (around the middle)
and can be adjusted.
The problem, it seems is that youre idle with the ac on is at or around 1200 rpm. That is the magic # to turn the AC compressor on. if it falls below that it will kick off. And the reverse will turn it on, causing it to surge. The answer to this is to turn the Idle valve up some and keep it from going below 1200 RPM.

PS I'm not sure which way to turn it to make it change.

Good luck and let me know how it turns out.Feel free to PM me if needed.
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Old 09-15-2005, 03:07 PM
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You have the A/C fast idle set too high and this is causing you to hit the ECU's fuel cut RPM when you apply the brakes, see this recent Toyota Trails Truck Tech column Q&A:

http://www.4crawler.com/4x4/TLCA_Tru...ech.04.09.html

Note: I can exactly duplicate this on my '85 if I crank up the A/C fast idle setting too high. If I turn the fast idle down the problem goes away.

Last edited by 4Crawler; 09-16-2005 at 07:39 AM.
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Old 09-15-2005, 03:22 PM
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Thanks Roger
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Old 09-29-2005, 04:27 PM
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Clean your throttle body. Then try it. Clean the living crap out of it.

James
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