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Is there a way to adjust idle, idles high?

Tiny
CLC
  • MEMBER
  • 2000 TOYOTA 4RUNNER
  • 115 MILES
High idle of about 1000 rpms with a.C. On stopped at red light in gear, About 1500 rpms when you place in park. No check engine, no stored codes. I have ask before thought it was the iac but it starts up cold just fine. Happens it seems after it is warm. Could not find any vacum leaks?
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Monday, April 2nd, 2012 AT 2:35 PM

17 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Idle is computer controlled and cannot be adjusted. It sounds like the IAC valve is not working right or needs to be cleaned here is a guide to help you get the problem fixed.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

and

https://www.2carpros.com/articles/engine-idles-too-high

Please let us know what you find. We are interested to see what it is.

Cheers
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Monday, April 2nd, 2012 AT 2:44 PM
Tiny
CLC
  • MEMBER
  • 14 POSTS
Even if this is a cable controlled throttle?
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Monday, April 2nd, 2012 AT 2:49 PM
Tiny
CLC
  • MEMBER
  • 14 POSTS
Not sure what "u" iac in your answer means, I assume its the hoses going to the iac? Right? Is it okay to cut a gasket for the IAC after I clean it and the throttle body?
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Monday, April 2nd, 2012 AT 2:56 PM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
A vacuum leak will not do this with a mas air flow sensor. Sticking IAC or check coolant temp sensor.
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Monday, April 2nd, 2012 AT 3:01 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Sorry for the typo, it should read IAC only. A vacuum leak before the throttle plate would not but a vacuum leak after it would increase the idling speed.
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Monday, April 2nd, 2012 AT 3:05 PM
Tiny
CLC
  • MEMBER
  • 14 POSTS
Thanks guys for your help, I really appreciate it.
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+1
Monday, April 2nd, 2012 AT 3:26 PM
Tiny
CLC
  • MEMBER
  • 14 POSTS
Its me again with the 2000 4runner hign idle issue. No vacum leaks found. I noticed when I start the vehicle cold, the fan cluch comes on for a few seconds, then shuts off when the engine is cold. May be the coolant temp sensor. Does anyone know or have a pic of this sensor or know know where it is located? Need your opinion on what you think. What about vacum diagrams for this vehicle?
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Tuesday, April 3rd, 2012 AT 5:08 PM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
I WILL ATTACH A CHART AND LOCATION
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Tuesday, April 3rd, 2012 AT 10:55 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The clutch fan is operating normally.
Is the MIL indicating and have you tried to check for trouble codes?
I would still say the IAC is stuck in the open position.
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Wednesday, April 4th, 2012 AT 12:48 PM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
Try taping on it
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Wednesday, April 4th, 2012 AT 12:52 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Either of the temp sensors could be inaccurate but that should be check with a scan tool to compare temps between the CTS and IAT before the truck is started after sitting to full cool.
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-1
Wednesday, April 4th, 2012 AT 1:08 PM
Tiny
CLC
  • MEMBER
  • 14 POSTS
Its different than the Fords. I am really not sure which one to tap on? I see the butterfly where the throttlw cable is attached, but the iac? Has to be on the blind(firewall side)side. You know you may be right. Makes sense that its stuck open. If someone has a pic would be good, or I guess if its stuck open, the butterfly will be open if I take off the air tube on the throttle body and look. What does it look like? Guess I will have to remove tube and see. Thanks guys. Appreciate it!
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Wednesday, April 4th, 2012 AT 1:52 PM
Tiny
CLC
  • MEMBER
  • 14 POSTS
This is a california emission vehicle, and understand there are different iac's.
Thanks
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Wednesday, April 4th, 2012 AT 1:55 PM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
S listed as top center of engine
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Wednesday, April 4th, 2012 AT 2:03 PM
Tiny
KHLOW2008
  • MECHANIC
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It is attached to throttle body, under it with 2 coolanr hoses.

If vehicle is equipped with throttle opener, ensure it is not leaking and throttle opener vacuum is working to re;lease the throttle.
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Wednesday, April 4th, 2012 AT 2:21 PM
Tiny
CLC
  • MEMBER
  • 14 POSTS
Thanks guys, appreciate it
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Wednesday, April 4th, 2012 AT 4:14 PM
Tiny
CLC
  • MEMBER
  • 14 POSTS
Good morning guys. Well on my 2000 4Runner we have been talking about; it was the IAC. Replaced it, after 200.00+ it seems to fine. Thanks. I love this site all for free great job guys
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Saturday, April 7th, 2012 AT 2:08 PM

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