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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

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Old 04-27-2009, 09:21 AM   #1 (permalink)
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Symptoms of a bad IAC valve?

Hi everyone:

Need the group's collective knowledge here. I have a '98 Tacoma 4x4, V6. I am wondering what the typical symptoms of a bad IAC valve are? Sometimes (more often in the last week or so) the truck will idle around 2,000 rpm on a cold start; after a while it will go back to a normal idle.

Reason I suspect the IAC is, a while back I had a CEL on and the computer was throwing a code for a bad IAC. My mechanic cleaned out the throttle body and the code went away. Now it is not throwing a code but the idle-up is screwy. Want to be sure it is the IAC before spending $$ on the part...

Thanks!
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Old 04-27-2009, 11:07 AM   #2 (permalink)
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I had a bad IAC valve and the only symptom was the high idle, 1700 rpm cold and 1200 rpm hot, no CEL. I replaced the valve and idle has been normal since.
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Old 04-27-2009, 12:00 PM   #3 (permalink)
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I have actually cleaned mine up really good, actually taking it off the throttle body which can prove sometimes difficult. You have to take off the valve anyway to replace it but you can really clean it out where is adjusts in the throttle body with some carb and choke. In my V6 camry, it would start and then quit. Bad IAC. I took the throttle body completely apart, including the IAC valve and found that it wasn't even moving at all. Cleaned everything really, really good, put a little oil around the rubber gaskets to seal them and it works awesome, no more trouble. I probably used about 2 cans of Carb and choke.
BTW, if you just spray carb and choke into the throttle body with it on the car and running, it will not clean the IAC.
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Old 04-27-2009, 01:46 PM   #4 (permalink)
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Alright...I'm reasonably sure that is the issue. I'm going to just replace the IAC since the mechanic already reamed it out once; chances are if I just spray carb cleaner on it I'll be in the same boat in a few months. Thanks!
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Old 09-14-2009, 05:03 PM   #5 (permalink)
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When I had my A/C on, the idle would intermittiently drop down to 300-400 rpm's along with a "click" sound. I cleaned the IAC = smooth idle and no more rpm drop w/ the Air Conditioner on.
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Old 09-14-2009, 05:03 PM
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