surging idle with a/c on?

91RN81 · 09-14-2005, 11:59 AM

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!

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seaflea · 09-14-2005, 12:30 PM

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.......

91RN81 · 09-14-2005, 08:08 PM

I dont see any information about this on 4crawler.com??

seaflea · 09-15-2005, 03:57 PM

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.

4Crawler · 09-15-2005, 04:07 PM

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.

seaflea · 09-15-2005, 04:22 PM

Thanks Roger

JamesD · 09-29-2005, 05:27 PM

Clean your throttle body. Then try it. Clean the living crap out of it.

James

09-14-2005, 12:30 PM	#2 (permalink)
seaflea Contributing Member Join Date: Nov 2003 Location: wilmington nc Posts: 1,602	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....... __________________ Will WabFab Off-Road, LLC Toyota 4x4 Parts and Custom Fabrication updated website with lots of new products 87 runner with every bolt on available

09-14-2005, 08:08 PM	#3 (permalink)
91RN81 Registered User Join Date: Sep 2005 Location: Upstate S.C. Posts: 108	I dont see any information about this on 4crawler.com?? __________________ 1991 Toyota Pickup 22RE 2wd 1/2 ton 5spd; Genuine Toyota Quality

09-15-2005, 03:57 PM	#4 (permalink)
seaflea Contributing Member Join Date: Nov 2003 Location: wilmington nc Posts: 1,602	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. __________________ Will WabFab Off-Road, LLC Toyota 4x4 Parts and Custom Fabrication updated website with lots of new products 87 runner with every bolt on available

09-15-2005, 04:07 PM	#5 (permalink)
4Crawler Contributing Member Join Date: Jun 2002 Location: SF Bay Area, CA Posts: 8,292	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. __________________ 1985 Toyota 4Runner SR-5, 22REC engine, dual t-cases, 4.88 gears, dual ARBs, 33x10.50 BFGs or 35x12.50 MTRs r.c.brown@ieee.org TruckEditor@tlca.org Project: 4Crawler 4Crawler OffRoad Gettin'Off 4WD Club Last edited by 4Crawler; 09-16-2005 at 08:39 AM.

09-15-2005, 04:22 PM	#6 (permalink)
seaflea Contributing Member Join Date: Nov 2003 Location: wilmington nc Posts: 1,602	Thanks Roger __________________ Will WabFab Off-Road, LLC Toyota 4x4 Parts and Custom Fabrication updated website with lots of new products 87 runner with every bolt on available

09-29-2005, 05:27 PM	#7 (permalink)
JamesD Registered User Join Date: Sep 2005 Location: Binghamton, NY Posts: 1,888	Clean your throttle body. Then try it. Clean the living crap out of it. James __________________ New Tacome V6 transfer case http://www.yotatech.com/f107/sale-br.../#post50755569 Various Toyota truck/4Runner switches for sale http://www.yotatech.com/f109/various...trucks-148139/

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