crazy high idle issue
06-12-2009, 04:49 PM
#1
3rd Gear Member
Thread Starter
Join Date: Apr 2007
Location: Georgia
Posts: 931
crazy high idle issue
Hey guys, I've replaced the tps and the iac. with the idle screw in the factory location the car wants to idle around 3k. Unplugging the iac or tps does nothing and I'm not getting any codes. If I back the screw out till the blade is closed all the way idle is still around 1900. Idle speed is set to 800 in the tune. This all happened out of the blue with no warning signs just went crazy as I was leaving out for the track one day. Anyone hear of such a problem, or know what a fix may be?
06-13-2009, 10:51 AM
#3
3rd Gear Member
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Join Date: Apr 2007
Location: Georgia
Posts: 931
Sure haven't, I don't know what that would be, I did try swapping o2 sensors to no avail though.
Edit- Just looked that up are you talking about the keep alive memory? and removeing the battery cable for a period of time? If so, no I've not done that.
Edit- Just looked that up are you talking about the keep alive memory? and removeing the battery cable for a period of time? If so, no I've not done that.
Last edited by Chris98Gt; 06-13-2009 at 10:55 AM.
06-13-2009, 01:41 PM
#5
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Join Date: Apr 2007
Location: Georgia
Posts: 931
Yea, I figured thats what he was talking about after I thought about it. I did that with no results in the good. sprayed starting fluid all over the intake track upper plenum gaskets egr gaskets and head to intake surface with no rev up, doesnt seem like a vacume leak if I cant get it rev like that.. unplugging the iac should drop idle, but doesnt do anything. Will it throw a code when the iac or tps goes out? Cause I'm not gettin any codes.
06-13-2009, 02:32 PM
#6
4th Gear Member
Join Date: Jun 2007
Location: Ohio
Posts: 1,996
Try unplugging the MAF while the car is running and see if it makes a difference. If it does then I would take apart the MAF and clean it with some MAF cleaner. I've heard of bad MAF sensors creating a high idle or a low idle when they go bad.
06-13-2009, 04:18 PM
#8
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Join Date: Jun 2007
Location: Ohio
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Well if I was you, I would go get some MAF sensor cleaner. I picked mine up from the local Auto Zone for like $4.99. You will also need a T-20 security Torx bit to pull the actual sensor out of the housing, and then spray it down real good.
Another thing you can try, is to take the IAC off the plenum and leave it plugged in. Have someone turn your key to the on position, but don't start it. Stand there and watch that plunger, it should move in or out I forget which one, but if it doesn't then I would start checking voltage at the connector that plugs into the IAC.
Has the car been running hot at all?
Another thing you can try, is to take the IAC off the plenum and leave it plugged in. Have someone turn your key to the on position, but don't start it. Stand there and watch that plunger, it should move in or out I forget which one, but if it doesn't then I would start checking voltage at the connector that plugs into the IAC.
Has the car been running hot at all?
06-14-2009, 08:06 AM
#10
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Here's the procedure for properly setting the throttle valve stop screw, if the idle is still uncontrolled after adusting the throttle sop screw then the IAC is bad, you have a vacuum leak drawing in unmetered air, or the control circuits for the IAC are bad...