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Why does my car idle up and down - Explorer Ford Cars & Trucks

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  • john doe Jun 27, 2013

    I'm having Idle surges while in neutral on my 2005 Acura RSX type-s 68,000 miles on her. Here is a video, thanks.http://www.youtube.com/watch?v=9vKFQn_wC...

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This is called idle surge, do the following to correct it 90% of the time. Read the many symptoms and then do the procedure exactly as outlined by nme in the article I wrote about this.

Here are the common cause of idle surge, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won

Posted on Dec 29, 2010

  • 13 more comments 
  • yadayada
    yadayada Jan 04, 2011

    I have been a Ford dealer tech for 30 years, this is a correct solution. Please try it before you bo-who it.

  • Han Jan 08, 2011

    it appears the end to what your saying was cut-off could you continue it in comments?

  • yadayada
    yadayada Jan 08, 2011

    Sorry bout that.
    To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

  • Han Jan 08, 2011

    awesome, will update for certain once completed.

  • mountainlogw Jan 08, 2011

    Did this work on your car? I have a 1989 ford festiva that idles really fast until warmed up and then idle is very erratic high and low.

  • yadayada
    yadayada Jan 08, 2011

    It works on any fuel injected car including this one. I am a retired Ford dealer tech so did many of these. Have you done the fix yet??

  • mountainlogw Jan 08, 2011

    nope i live in a small town and parts store is closed today. I'll have to try it on monday. Thanks for the input though, hopefully it will work. The car sat since 2001 so im sure it needs some cleaning.

  • yadayada
    yadayada Jan 09, 2011

    Sure hope you had fuel stabilizer in this, if not you may have big problems like clogged injectors

  • mountainlogw Jan 10, 2011

    the car has been running and i have been driving it but it just has the idle problem. It won't run with the hose off so I did what the cleaner said and sprayed without it running. It started back up but when I shifted into drive it stalled and wouldn't start again. Any suggestions?

  • mountainlogw Jan 10, 2011

    the car has been running and i have been driving it but it just has the idle problem. It won't run with the hose off so I did what the cleaner said and sprayed without it running. It started back up but when I shifted into drive it stalled and wouldn't start again. Any suggestions?

  • yadayada
    yadayada Jan 10, 2011

    Time to scan the electronic engine control system and check the fuel pressure..

  • mountainlogw Jan 10, 2011

    Is it possible I sprayed to much cleaner and if so what should I do?

  • yadayada
    yadayada Jan 10, 2011

    No it would start after just a few seconds of cranking, you have some other problem, have done 100's of these cleanings whiole working for Ford dealers. Do the system tests for codes.

  • mountainlogw Jan 11, 2011

    Thanks, we checked and there is no spark so we are working on that now. I'll let you know how the cleaner worked when I get it running again

  • Han Jan 11, 2011

    no it didn't work, my MAF is likely the culprit, this is for a 2000 Cadillac Catera, the MAF is such a problem Consumer Reports had some unpleasant remarks about it. So I must fall in the 10% fail rate.

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Irregular idling generally happens on cold starts, cold weather and improper air/fuel ratio setting. If you car has an ECU and mpfi system, expect irregular idling on the start. This is because of the auto choke function enabling a warm engine. If the problem is constant throughout the day, you can refer this Rectify & Repair which will enable you to troubleshoot and rectify the error.

Posted on May 20, 2013

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I have a 1990 S-15 with 4.3 motor idles high when you start, idles down , set and idle for a while it starts idling up and down.any idea's?


Could be a faulty idle air control valve.
The computer controls idle speed by regulating how much air enters the throttle body thru the valve.
You could unplug the valve when the idle speed is close to normal, then shut the engine off and restart to see if the idle speed is still in the same place. Unplugging the valve will also set a trouble code and turn the warning light on.

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My car is idling up and down


Engine stall or RPM fluctuates at idle.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

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I have 1999Chevy suburban with 6.5 turbo diesel motor.it idles up and down and when driving the gas pedal is real touchy Wat is the problem and were do i locate the problem


Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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For rough idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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This will help.

Thanks.

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Idles up and down after warm up


THE COOLANT LEVEL IS LOW

on the older hondas even the newer ones idle speed is coolant temp controlled.

when the engine idles up the electronic coolant temp sensor is submerged in coolant and reads warm, so the engine computer idles the car down. the coolant level if low than drops from around the coolant temp sensor and it says the engine is cold, so the engine computer idles the car up.

which results in the constant rise and fall in engine rpm.

ADD COOLANT TO THE RADIATOR AND WATCH THE CAR MAGICALLY FIX ITSELF.

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1 Answer

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Its could be a few things. Most likely cause is you IAC (Idle air control valve) If this valve gets clogged up with carbon it will cause a idle surge on cold starts like you are describing.

Next your FITV (fast idle thermal valve). When the hot wax inside of this valve starts to wear it will cause a idle surge on cold starts.

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