Question about 2004 Ford Taurus

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04 taurus rough idle while using AC.

Engine has a very rough idle when AC is being used.

Posted by Anonymous on

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  • 315 Answers

It sounds like the idle up switch is faulty, find it and replace it.

Posted on Sep 09, 2014

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Posted on Jan 02, 2017

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Jeremy Reddick

  • 1902 Answers

SOURCE: rough idle and check engine light concord

Check your EGR valve and your IAC Idle Air Control valve make sure both are functioning correctly

Posted on Feb 15, 2009

Anonymous

  • 3 Answers

SOURCE: discovery 04 idles rough after 10mins

could be faulty plugs, wire, idle sensor or fuel filter. on board diagnostics may give you a code. haynes manuels can give you instructions on OBD.

Posted on Apr 11, 2009

Anonymous

  • 3 Answers

SOURCE: FORD WINDSTAR 3.8 V6 ENGINE IDLE ROUGH UP AND DOWN WHEN STANDING

Idle air control valve is the problem. "idle motor" tap it with a hammer it should temporarily solve your problem. it is right on top by the throttle body.

Posted on Dec 19, 2009

david riddell

  • 2 Answers

SOURCE: rough idle and stalling 2003 ford taurus ses

mine did the same it was the map censor had new one installed about 125$

Posted on Dec 07, 2011

raj somaiya

  • 5370 Answers

SOURCE: Ford Taurus idle missing

It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues.Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----
Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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1999 Ford F-150 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

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Engine stumbles coming off idle when warm?

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

------------------
Erratic idle on car?

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

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Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

----------
Low idle when cold out side?

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

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GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

--------


GMC Idle Air Control (IAC) Valve Replacing?

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

-------------
1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

------------
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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High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.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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Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

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High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-------
Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

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Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

-----------
While stop engine idles like cylinder missing?

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

---------

These details will help.

Thanks.

Posted on Nov 24, 2012

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1 Answer

I have an Elantra 1.6 gls rough idling when switching on ac 1.6gls 2003


First try cleaning the engine throttle body and the idle speed control valve, it may have a slow idle due to these parts being full of sludge. Use a can of spray throttle valve cleaner. After cleaning disconnect the battery negative post for 5 minutes and then drive it about 5 miles, if the idle shake continues the next step is to install new engine and transmission mounts,.

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Putting on the AC causes power to be taken from the engine, and that is quite usual (unless it's taking excessive power but if there are no noises and it's working ok that's unlikely).
That will slow down the engine (similar to switching on your heated rear window whilst idling)
What you are seeing is the idle is probably a bit slow, and it's too slow with AC on. Have a diagnostic run to check idle speed and mixture at low revs.

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Car runs rough when ac is cut on. seem like it puts a load on engine.


I believe your A/C idle up valve may have failed. They do this when hot, but test OK when cold. See here p228

http://www.turboninjas.com/camry/eg1.pdf

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The ac compressor pulls a good number of horses from a 4 cyl engine.
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If you have a misfire you will have a blinking check engine light in the dash, if not you just have a possible engine mount problem which causes the engine to feel rough at idle due to the load of the AC being on. let me know.

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1997 escort idles rough, the first thing is to make sure the throtlebody plate is clean. This sounds like the idle may be staying to low at times if it smooths out with ac on, when the ac is turnned on the computer raises the idle a touch to make up for the strain on the engine from the ac compressor, clean throtlebody and look at and clean idle air control valve, if this valve is not controlling the idle when needed the engine will idle lower than normal and cause a rough idle.
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I have a 4 liter V6 2003 Ford Explorer ( 2 door). The check engine came on and then it started idling rough. When it idles rough the AC blows hot. Recently it has started stalling when idling at a...


Hello! Most probable cause is a leak in the vacuum line or broken elbow connection to the Positive Crankcase Ventilation (PCV) valve...Check PCV and its vacuum line...Send results...

Guru..............saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

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