Question about Ford Cars & Trucks

2 Answers

My 93 ford f-150 is stuck in high idle!

Ive replaced the iac valve, o2 sensor. it got worse after i cleaned the throttle body. i can slow the idle if i put my hand over the throttle body an block the air going into it. so for some reason its sucking way to much air. i have to use starter fluid to start it now.

Posted by on

  • Jason Murray Oct 31, 2012

    i replaced that last night and it didnt help. thanks for the reply tho.

  • Steve Jensen
    Steve Jensen Oct 31, 2012

    have you tried the TPS (Throttle Position Sensor?



2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 417 Answers

IAC or Idle Air Controller. Thatd be the place to start.

Posted on Oct 31, 2012

  • 6 more comments 
  • Jason Murray Oct 31, 2012

    i put a new one on last night and disconnected the negative battery cable for a couple minutes but nothing changed. guess i will take it off and make sure its a good part. thanks for the reply.

  • Steve Jensen
    Steve Jensen Oct 31, 2012

    Sorry about my first response for some reason I didn't see you said u replaced the iac already.

  • Steve Jensen
    Steve Jensen Oct 31, 2012

    Also check for sticking throttle linkage, vacuum leak at intake manifold or hose connections and if all else fails it could be a malfunction in the fuel injection or engine control systems.

  • Jason Murray Nov 01, 2012

    i did replace the tps an the mechanic said it checked out ok. i will check for vacum leaks tonight by spraying carb cleaner around. i want to check the mass air flow sensor but cant seem to locate it.

  • Steve Jensen
    Steve Jensen Nov 01, 2012

    MAF should be in between filter and throttle body You should see the wires that run to it going into the air tunnel between the 2.

  • Jason Murray Nov 01, 2012

    thanks bud ill look tonight

  • Steve Jensen
    Steve Jensen Nov 04, 2012

    Just curious if you figured your problem out and if you did, what it was?

  • Jason Murray Nov 20, 2012

    no, its cold here so i had to buy another ride to get me thru the winter. im gonna hafta take it back to the shop when i get the money. thanks for your input tho im sur this will help others.


  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 20 answers of more than 400 characters.


    An expert who has answered 20 questions.

  • Expert
  • 88 Answers

It is symptomatic of a throttle position sensor. After removing the throttle body, the two screws that secure the tps can be very tight. Use the correct size driver to get a tight fit when removing the screws. You may need to use a penetrating lubricant if you judge that the screw is frozen and the head may strip. You may be able to apply some heat to the screw also, be careful.

When the throttle body is off, slowly move the accelerator linkage to see that the throttle body plates are; opening and closing without hanging up, are moving freely without feeling sticky and the accelerator linkage shaft that goes through the throttle body and keeps the throttle plate(s) aligned and secure has no free-play and there is nothing else on or around the sensor that could affect its operation.

Clean all associated parts as per manufacturer's recommendations. Remember to mark or record where all parts were removed from for easy reassembly.

Good luck!

Posted on Nov 24, 2014


5 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 314 Answers

SOURCE: Loping and high idle

You are really onto it! Either the TPS or the cable from the peddle. Do check the cable first. Frankster016

Posted on Oct 26, 2008

  • 5 Answers

SOURCE: 2500 to 3000 rpm idle

Change your Thottle positioning Sensor. My 93 lesabre did the same thing and i changed the TPS and it stopped.

Posted on Jun 25, 2009

  • 73 Answers

SOURCE: My Ford Explorer idles too high - I've cleaned the

The throttle linkage may be sticking. May have a vacuum leak at the intake manifold or with the hose connections.

Posted on Mar 28, 2010

  • 3 Answers

SOURCE: I have replaced the throttle position sensor, egr

Check the Idle accelerator valve located on front side of throttle body, it is either stuck or needs cleaning real bad, this is what controls your idle speed, by letting small amount of air in. It has a plunger on it that moves back and forth slowly to adjust amount of air mixture, it is controlled by computer. Unplug it and just turn on key and check for voltage.This valve gets real gummed up, probably need to take apart throttle body and clean. HUNT

Posted on Jun 07, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

02 ford escape very high idle

Try taking pff your throttle body and cleaning it and also check and see if your throttle cable is tight or try loosening it and see if the throttle drops. Could also be a bad o2 sensor staying in open circut

Apr 27, 2016 | Ford Cars & Trucks

1 Answer

Erratic idle occurs on it's own. The vehicle is a 2002 F-150, 4.2 V-6. I have replaced IAC, TPS, PCV, all 4 O2 sensors, Plugs, wires and coil pack.

hey try an clean ur throttle body or plate. open it up and check to see if it is black. if so chances are thats ur idle problem. try an clean with a rag an brake cleaner or carb cleaner. good luck

Nov 16, 2015 | Ford F-150 Cars & Trucks

2 Answers

1997 ford taurus, it had brought up codes for the o2 sensors we replaced them, it keeps saying it is to lean. we went through and thoroughly cleaned everything even the new spark plugs, wires coilpack,...

Check vacuum lines. Replace as needed. Clean the throttle body, inside of it. Use brake clean and a tooth brush. Clean the back side of the throttle plate and where it setts in the throttle. Clean the MAF sensor, just spray this down on both sides. Don't use a brush on this. You could break it. Once done cleaning, leave the MAF off. Start the car, it will take a second or two. Rev the engine up and spray brake clean into the throttle, not so much to kill the engine. Do this two or three times. Then put it back together.

Jan 18, 2015 | 1997 Ford Taurus

1 Answer

Where is the tps on a1989 f-150?

Clean the throttle body both plates. Tp sensor is underneath the throttle body. You will have to remove it to replace it. Check for vacuum leaks.

Feb 22, 2013 | 1989 Ford F 150

2 Answers

Have 03 Chrysler Sebring 2.4 Lx with a very high idle. (Undriveable ) replaced the map and throttle position sensor. That didn't work. Any ideas?

your throttle body door is stuck open check the cable from the gas pedel to the throttle body. if anything just to both cables off the throttle body andrun it. if it is the same with cables off when your idle air control valve is bad

Dec 05, 2012 | Cars & Trucks

1 Answer

I have a 97 chevy malibu which is idling too high, when I switch to drive or reverse in jumps or bangs but drives fine ? what could be the problem ? I replace the pts sensor and it became worse ( the...

the ( iac ) idle air control needs cleaned. it is mounted on throttle body to control idle speed, remove the torx screws holding it on. do not put body of valve in any liquid or it will ruin it. clean valve on end with carb, or throttle body cleaner. use a old tooth brush to clean it, or similar. this should do the trick if it is not bad!! also check wiring to it for broken wires etc. have a good day !! do not push on valve or it will mess up setting. proper setting is 1 and 1/8 from tip of valve to body of iac. hope this helps.

Feb 08, 2011 | 1997 Chevrolet Malibu

2 Answers


The idle is electronically adjusted by the ECM with the IAC (idle air control) valve which is located in the throttle body. Then the IAC get's to dirty from carbon build up, it can cause what your experiencing
Start with cleaning the throttle body, paying attention to the IAC passageway to try to clean the IAC. If this does not fix the issues, you may have to replace the IAC if it is to dirty to clean.
Thank you for using fixya and good luck, do not use carb cleaner, the carburetor cleaner is to corrosive to the gaskets used on the throttle body's. .

May 03, 2010 | 2000 Chevrolet Silverado 1500

3 Answers

1999 Chevy Silverado - revving/lunging issue

The idle ait control valve is at fault. Replace it and it is a self learning sensor that needs no adjustment as the older models had

Mar 26, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

1989 ford f-150 not starting, new plugs wires, turns over, no start, maybe unburned fuel?

If it turns over the problem is either the spark plugs or the fuel filter or fuel pump. Begin by checking the spark plugs and changing the fuel filter.

Feb 25, 2010 | 1989 Ford F 150

1 Answer

How do you lower the idle

The idle speed on this vehicle is controlled by the engine computer. If it seems to be idling high, the idle air control valve (IAC) may be stuck or faulty. This can sometimes be corrected by removing the IAC and cleaning carbon deposits out of it with carburetor cleaner. Some sensors can also cause a high idle, such as air temperature sensors or throttle position sensors. If everything else seems to be OK, however, the IAC is the best bet.

Dec 17, 2009 | 1994 Ford Explorer Limited

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

138 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

76848 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers


Level 3 Expert

5546 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides