22RE Idle Speed Control Valve Test?

pcmentor · 11-19-2006, 07:12 PM

Can anyone tell me how the ISC works and how to test it. The ohm reading checks out. I am troubleshooting a low idle problem when hot and in gear. have checked the TPS and EGR. What other things can make the idle low?

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NCSU-4runner · 11-19-2006, 09:08 PM

dunno if its anthing like a supra ISC but this is how you do it for a 7M

when i checked mine the movement is VERY subtle, you almost have to have someone else ground the points while you stare at the part that moves

http://www.cygnusx1.net/Supra/Librar...on=FI&Page=107

frty6&2 · 11-21-2006, 01:43 PM

Your MAF sensor could be off, dirty, or broken or you could have a vacum leak, or your timing chain could have jumped a tooth if the chain guide is broken, which they usually are. And I have no idea how the ISC valve works, I just turn the screw till the idle is around 800-900 and roll. Good luck,

Mike

pcmentor · 11-26-2006, 04:49 AM

The idle somehow is now at a good level. I fixed it some how. Thanks for your input. Pete

pcmentor · 05-28-2008, 04:25 AM

I'm not having idle speed problems now but I get a miss at 2500rpm. Replaced all tuneup stuff. The O2 sensor voltage is around .19vdc at idle and goes up to .45 at 2500. The O2 also throws a code if left at 2500 rpm for two minutes. Must be lean for some reason. Fixed major vacuum leaks but still low voltage. Any help will be appreciated. Thanks

11-19-2006, 09:08 PM	#2 (permalink)
NCSU-4runner Contributing Member Join Date: Apr 2003 Location: Raleigh NC Posts: 1,597	dunno if its anthing like a supra ISC but this is how you do it for a 7M when i checked mine the movement is VERY subtle, you almost have to have someone else ground the points while you stare at the part that moves http://www.cygnusx1.net/Supra/Librar...on=FI&Page=107 __________________ Jeremy, 94 4Runner Turbo Leaf Spring SAS front - Coilover 4link rear (starts December) / Supra Swap My Truck is featured on Supracharged.com - Home of the original Supra swap and Forum One of two things will happen, I will die, or the truck will be finished. I'm not sure which will be first.

11-21-2006, 01:43 PM	#3 (permalink)
frty6&2 Registered User Join Date: Jan 2005 Location: Home of Pure American Metal Posts: 57	Your MAF sensor could be off, dirty, or broken or you could have a vacum leak, or your timing chain could have jumped a tooth if the chain guide is broken, which they usually are. And I have no idea how the ISC valve works, I just turn the screw till the idle is around 800-900 and roll. Good luck, Mike __________________ -85 4runner w/ mods.

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11-26-2006, 04:49 AM	#4 (permalink)
pcmentor Registered User Join Date: Jul 2006 Posts: 177	The idle somehow is now at a good level. I fixed it some how. Thanks for your input. Pete

05-28-2008, 04:25 AM	#5 (permalink)
pcmentor Registered User Join Date: Jul 2006 Posts: 177	I'm not having idle speed problems now but I get a miss at 2500rpm. Replaced all tuneup stuff. The O2 sensor voltage is around .19vdc at idle and goes up to .45 at 2500. The O2 also throws a code if left at 2500 rpm for two minutes. Must be lean for some reason. Fixed major vacuum leaks but still low voltage. Any help will be appreciated. Thanks