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Idle speed is really high when started or too low

Im not sure whats going on with my truck when its first started it usually idles extremely high and loud then sometimes when i start it up its really low idle. im not sure if this is a efi problem or what. if anyone has a suggestion that would be helpful.

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  • Cars & Trucks Master
  • 21,873 Answers

If this is for your Mighty Max truck, the problem could be the idle air control valve. The computer controls the idle speed by regulating how much air enters the throttle body thru the valve.

Posted on Jan 11, 2013

  • Keegan Perea
    Keegan Perea Jan 11, 2013

    where is this idle air control valve located? and do i just clean it or replace this part?

  •  Stephen
    Stephen Jan 11, 2013

    If you have fuel injection, it should be in the side of the throttle body. You may need to clean it or replace it depending on if it is sticking or just not working. It is a small electric motor that opens and closes a valve.

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Posted on Jan 02, 2017

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SOURCE: 1989 honda prelude enigne idles high then low irratic

I had the same problem on a Rover. There was a leak in inlet manifold that was caussing the problem.
To verify, spray some sealant to temporarily seal the inlet manifold .and the eratic idling should disappear for some time.
If it does, you know there is leak in inlet manifold which you can take of and refit with a new gasket.

Posted on Oct 27, 2008

  • 1 Answer

SOURCE: high idle/low idle pattern

This issue is caused by the egr valve being stuck open, more than likely. Just remove it and clean the plunger on it. Also clean out the two ports that are in the intake. Check out saturnfans.com for more information. I hope this helps.

Posted on Dec 09, 2008

  • 2 Answers

SOURCE: engine stalls after cold start-up & release from high speed idle

I had a similar problem.  I found the filter cartridge below the pcv valve had carboned up, and after the crank case pressurized, oil was forced out the pcv supply line to the throttle body.  The idle air control valve solenoid got oil in it and caused my problem, but only when it was cold.  The pcv cartridge is accessed by removing the pcv valve and the rubber fitting that the pcv valve mounts in.  It can then be fished out with a pick set, and it is a pain because you can't see it, but you can get you hand back there.  I hope this helps you.

Posted on Feb 28, 2009

  • 1 Answer

SOURCE: mitsubishi idling problem!!??

Am not shure the kind of engin you really have but see if your stepping mottor is damage or need relpacing. that problem can happen if you have a faulty unit . it also called the step up unit or sensor, if your car have air condition is turned on and the rpm goes up and down that can be the problem , the unit can be found attached to the throttle body. just below.

Posted on Mar 20, 2009

  • 53 Answers

SOURCE: 2003 toyota sienna idle problem

After about 100K + miles the idle air control valve (IAC) begins to collect carbon deposits that interfere with the movement of the spring-loaded valve. You will not be able to clean this without removal and dissembly of the IAC body. Use an emory cloth or fine sandpaper to remove the build up around the valve. This should free it up to rotate without binding. This is a temporary fix, of course, and will either require cleaning again or replacement of the valve. Getting to the IAC requires removal of most of the intake upto, but not including, the intake manifold. Total time is approximately 3-4 hours, but worth it. Good luck, and I hope this helps.

Posted on Feb 21, 2010

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