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Idle control valve is not cutting down revs - Exige Lotus Cars & Trucks

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Possible vacuum leak into the manifold (inlet) or dirty iac causing it to stick remove and clean if this improves it renew the iac as cleaning never works for very long. if a K&N air filter is used remove it is bad for oxygen sensor, catalyst and iac as oil residue from filter can build up in iac causing it to stick. If none of these help check voltage to iac and feel for clicking when ignition is turned on and off .

Posted on Oct 05, 2008

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Posted on Jan 02, 2017

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How do I fix a problem of engine cutting out when I have air conditioning on and I slow down ?


idle air control valve problem , maybe ! Clogged passage . When you put extra load on the engine , such as turning on the A/C the PCM is suppose to raise the idle RPM . With a up scale scan tool you can see if the PCM is controlling the IAC valve . There are videos on you tube on cleaning The IAC , plus testing !
PCM is the engine computer ,just in case your not familiar with that .

Jul 20, 2016 | 2001 Ford Focus

1 Answer

When I start the car it stays at 2000rpm for a few moments then drops down. I'll drive for a few minutes then put it in park and it revs up and down.


idle air control valve is bad replace it. at start up choke control runs till warm up while driving throttle opening controls engine at idle ,the idle air control valve.

Aug 01, 2012 | 2005 Chevrolet Aveo

1 Answer

My car sometimes revs up and down a little bit when parked after long drives and now when i drive it feels like it cuts out and loss of power. Its been getting worse every drive.


If the idle seemed to go out of control further then the issue may be with the idle air control valve, it may be dirty or may have gone bad. Check also the fuel filter and loose wires and vacuum hoses.

Aug 02, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

My 1992 ford exploer will not hold a steady idle. I replaced the throutle positioning sensor.when i start it, it revs to 2 rpms then cuts of and sometimes it runs but the rpms go up and down for about 1 to...


  1. baring a major vaccumm leak
  2. idle speed control motor is probably sticking
  3. it is a 2 wire soleniod with an air shuttle which allows air to bypass the throttle plate.
  4. when acting up at idle tap the idle valve repeatedly with a small hammer.
  5. does idle change?
  6. if so replace valve

Aug 19, 2010 | 1992 Ford Explorer

2 Answers

When in park honda odyssey revs up and down between 1000 and 2000 RPMs


is the check engine light on also? it sounds like the idle air control valve is bad. this controls the idle of the vehicle. when it is stuck open it causes too much air into the engine and causes it to rev. when it gets to a set rpm, the pcm cuts fuel. then it turns the fuel back on, then the engine revs, then it cuts fuel........code p0505 will prob be set

Nov 26, 2009 | 2000 Honda Odyssey

1 Answer

Revs up and down at low revs


you need to clean or replace your idle air control valve(IAC). The IAC allows your engine to idle smoothly by opening and closing a valve that allows air flow to the engine that is monitored by the computer. The IAC get dirty causing it to stick and move slower than it should which causes the up and down idle

Oct 29, 2009 | 1998 Ford Escort

1 Answer

Car cutting out from cold start


You need a 10 mil and 8 mil spanner, carb cleaner and mabie some wd40.
Remove the big hose which goes from the throttle body to the air filter housing. Under the throttle body there is a idle control valve, unplug it, spray some wd40 on the 8mil bolts and take them off. Clean the idle control valve and housing and anywhere else which looks dirty, dry it with a lint free cloth and then put everything back on.
remove the battery negative terminal and leave it off for 30 minutes, this will reset the ecu to factory settings.

On the top of the throttle body there is a black circular rubber screw cover, take that off and there should be a plastic screw.

Connect your battery and start your engine, unscrew the idle speed control (plastic screw) so it revs at 2000rpm cold. When the temp needle reached the middle so it revs at 1000rpm hot.

This should solve the problem, if you drive around and find that you in 4th gear, with your foot off the accelerator and the idle is going up and down madly then the idle control valve is worn out and it needs replacing. Cost around £125 on ebay.

Oct 17, 2009 | 2002 Mitsubishi Lancer

1 Answer

Idle problem: motor revs up and down at idle


it sounds like your idle control valve needs cleaning or replacing

Oct 08, 2009 | Honda CRX Cars & Trucks

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