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Ford mustang idles high.

Its not the idle air control valve or the mass air flow sensor. What else could it be? my mechanic doesn't know

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  • 6 Answers

Sticking throttle body butterfly

Posted on Jul 24, 2013


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Posted on Jan 02, 2017

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SOURCE: transmission won't shift

Throttle position sensor

Posted on Jan 07, 2009

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SOURCE: 1997 buick lasabre custom high idle, transmission, stalling

had same problem i would check the Idel Air Valve and also check all of your vaccum hose lines makeing sure there are no cracks or splits in rubber connectors if there is repair immediatelt because over time they start to dammage the internal parts fo the engine and if youve replace tps mass air etc. sounds like a vaccum hose problem

Posted on Feb 10, 2009

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SOURCE: Idles bad

Sounds like you may have an upper intake manifold leak. Typically the gasket between the Plenum and the lower intake dries up and gets sucked into the intake a little causing a leak and a high idle issue. The repair requires the removal of the plenum and replacement of the gasket. NOTE: there is a torx bolt hidden between the center plenum runners and can only be seen by looking straight down at the top of the plenum and it may be covered in dirt. If you have to use a bar to pry off the plenum you probably have missed a bolt. Typically it is the one noted above. Best of luck.

Posted on Mar 22, 2009

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SOURCE: 97 nissan pathfiner 3.3l idles too high

It has been my experience that this problem is usually caused by a dirty or bad Idle Air Control Valve (IACV). I would try removing the IACV and cleaning it thoroughly, as well as the air passages in the intake manifold.
You can check the valve itself. Check the resistance between the two terminals with an ohmmeter. The resistance should be approximately 10 ohms at 77°F. Also make sure the plunger moves in and out without sticking or binding and the spring is not broken.

OK now the bad news, the (IACV) is at the back of the engine and up against the fire wall. Lots of bad words will be used to replacing this and i think the dealer charges $550.00 in labour alone.
You can try running Sea Foam through the manifold, just follow the instructions and there will be lots of smoke, Do a search on You Tube for Sea Foam. You can try blasting it with throttle body cleaner though a vacuum tube and down the throttle body, may have to use three cans, just follow the instruction again.
Good luck and keep me posted.

Posted on May 27, 2009

  • 120 Answers

SOURCE: 93 Buick Skylark is idling really high. New

there is an automatic choke i think this is sticking dissconect this and check car idle then.

Posted on Aug 28, 2009

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Idle too high

Hi and welcome to FixYa!

Two things which can cause this issue. A faulty MAF (mass air flow) sensor or IACV (idle air control valve). If one of these sensor is faulty an erratic idle, too high or too low may occur. Have the engine scanned to know which of these sensor is faulty.

Hope this helps and thank you for using FixYa! Have a good one!

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93 Buick Skylark is idling really high. New computer was installed, new throttle control sensor, and idle air sensor. It is still idling too high. Throttle control was cleaned and it is still idling high....

Idling high in the skylark could be something to do with throttle control, or idle air control valve, other possibilities could be a vacuum leak or mass air flow sensor, it could also be a faulty system recently replaced. When you vehicle idles high it means it is getting more fuel than its suppose to in the fuel/air mixture, most times to much fuel in the mixture is caused by a leak or malfunction in the air delivery not allowing the appropriate amount of air in.

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check you throttle positioning sensor, also check your mass air flow sensor, by unplugging while your motor is running if idle returns to normal that may be the prob. hope i could help

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