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Chris Dohner Posted on Oct 10, 2014

WHY do it Idles fast? I changed the IAC!! And checked for vacuum leaks! And when I unplug the IAC it dies!! Plug it back in start it and pinch the vacuum line and it idles normal!!

5 Related Answers

culcat456

  • 36 Answers
  • Posted on Sep 25, 2008

SOURCE: Rough Idle 2000 ford Taurus OHV

This could be a bad a/c compressor or compressor pulley bearing.Try removing the serpentine belt and turning the compressor by itself.The bearing should turn very easily,and the compressor itself should turn.If it is vety hard to turn,it is bad.

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scott

  • 532 Answers
  • Posted on Sep 07, 2009

SOURCE: 91 Taurus idles @ 2000 to 2300 RPM's Have checked

try cleaning the air bypass solenoid at the throttle body,holds on with 2 bolts and is long and round with a wire plugged in at the end.its probably carboned up and sticking open

Testimonial: "Thank you for your responce. The problem was the Idle Air control valve. The diaphragm was torn. "

Anonymous

  • 198 Answers
  • Posted on Nov 23, 2009

SOURCE: 1987 F150 302. No trouble codes but engine idles too fast

The IAC (idle air control) may be stuck from dirt or malfunctioning.It's located in the intake near the throttle body.Remove it clean with carb cleaner and reinstall

Testimonial: "Thank you for response. Actually had IAC off and was clean inside. Resistance within range 9 ohms but voltage signal at 12.5 V rather than 10.5 V"

alicantecoli

Colin Stickland

  • 22516 Answers
  • Posted on Mar 15, 2010

SOURCE: 92 Ford F150 4.9L. starts good, idles rough, dies at slow speeds

4.9 litre ?? you having a laugh its a 10ton truck engine not a pick up -global warming machine,remove the pump/sender unit and check the gauze filter also look inside tank for a something floating around ,i think the idles is not a related problem to the vehicle losing power but their is a possibility you could have a problem with the little vac operated thing on the fuel injector line that allows the fuel through only when the engine is running

Anonymous

  • 50 Answers
  • Posted on Jan 24, 2011

SOURCE: already replaced iac and all vacum lines when i

Need more info - is it just in the morning? Takes long to crank? Idles rough???

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2000 firebird 3.8 series 2. New o2 sensors,egr valve,fuel filter.starts ok cold, 2-3 min.,idles rough and dies.o2, egr,the,Eva codes

Vacuum leak , IAC valve - idle air control , Go to your tube an check out videos on checking for vacuum leaks an how to test IAC valve an cleaning throttle plate an IAC - air passages ! Eva codes ? what code # ?
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My 2000 F250 5.4 idles 2500!! I unplugged the IAC and it dies plug it back in and pinch the vacuum hose off and it idles donw normal! So I changed it and it still does the same thing and I check for...

Fords are bad for Idle. Pinch the hoses of again. One at a time. When it idles normal. follow that line to find the leak. Ford has and still does have bad rubber elbows. They can't take the heat and oil. Most the leaks I find are under the intake plenum.
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1988 Suburban with 5.7 TBI runs fine until warms up. Goes to fast idle and when it comes off fast idles won't start back until cools down.

Lets start at the beginning. Is the check engine light on ?
You have an idle air control valve which could be sticking open or shorted to ground. You should be able to unplug it to test. There also could be a gasket or hose that is opening up and causing a huge vac leak.
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Car Idles up and down when warmed up

Could be your IAC (Idle Air Control), leaking throttle body base gasket, or a throttle position sensor
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1996 lincoln town car 4.6 fast idle in park and in drive idles to 10 mph

Did you check the airflow sensor? Clean it, maybe it will help
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5.4 ford idles to high

I'm kinda guessing the "hose" you are "pinching" off is the air assist to your injectors as most IAC Valves don't have any hoses unless it's this type of system. Are you gettting any codes or is your check engine light on ? I would guess that you have a vacuum leak which would be the most common cause of this kind of thing. You can check for one by spraying some carb/thottle body cleaner on your vacuum lines and aound the intake manifold, if the idle changes as you are spraying, you have located the general area of the vacuum leaks. If you are haveing problems in the IAC valve your check engine light should come on and pulling the code(s) will help you to narrow down the problem. Comment here to let me know if you have the light on and if you are gettting any codes and what they are. This would help me to help you better. Below I gave you a description of how the system works to help you understand the system better. I would check for a vacuum leak first. I know this wasn't a whole lot of help but I hope it helped you a little bit anyhow.


1_27_2012_11_28_38_pm.jpg1_27_2012_11_28_58_pm.jpg
3helpful
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Idle fluctuates

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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Still have some what of idle problem 95 cirrus 2.5

if it won't idle at all or even if it idles too fast sometimes check all the vacuum lines for leaks or one being unplugged
God Bless Greg
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