Question about 1994 Nissan Quest

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What is the IAC valve?

My van dies when cold. After it warms up it run ok. I want to know the meaning of the IAC

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Idle Air Control valve -used to control engines idle

Posted on Jan 09, 2013

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SOURCE: Car runs rough at idle.

check egr valve may be blocked

Posted on Mar 13, 2011

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84 mustang 5.0 auto-Idle problems. runs Ok when cold , runs rough and stalls when warm. 1st year throttle body injection. was told the IAC valve needs cleaned. can`t find on car


the iac sensor is along the side of throttle body , did you give the throttle plate area a good cleaning out this is where the air path is for the IAC sensor , a lot of idle problems have been fixed with a can of throttle body cleaner and few good squirts of the stuff down the hole

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I have a 1990 chevy conversion van,350 tbi,no problem in 5 yrs I've had it . got off hwy few eeks ago engine bogged down,kept stalling,I got stuck and was able to get it moving,running very rough 11


When cold start is on will make more fuel to the engine for warm up. Only makes sense that even after warm up it's still putting the extra fuel into the engine that a heat sensor is bad. Namely the one connected to the MAP. Use your head, not the mechanics with all they're test equipment that are checking the wrong thing. You've put out a lot of cash because they don't know what to check for and are putting YOU through this. They're in it for the money pal. Not to help fix your problem.

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I have a 1991 pontiac trans sport with a cold start engine surge. At cold start up the engine will increase and decrease in the rpm and sometime die but ofter the van worms up it seems to run ok.


remove and clean IAC ( idle air control ), this is what controls idling on to days cars. if this does not help a lot, check or replace coolant tempurature sensor. it may be bad, if it is, it will think the engine is always warm and send wrong info to pcm. good-day ! and may god bless. you can also have a vaccumn leak ! if check engine light is on, get it scanned to know what area is causing the problem.

Oct 16, 2011 | 1991 Pontiac Trans Sport

1 Answer

Truck starts ok idles and accelerate good when it is in parkand netral but when i put it in drive it wants to die and there is no acceleration.


sounds like you have a fouled idle air control valve . I know on the d 150 vans it is located on top at the rear of the engine . Un-plug the wire connector on the iac valve and spray the control valve with brake kleen till it is clean , shake the excess brake kleen out and re-install....it should run like new .

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