Still having high idle while coasting...
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Joined: Dec 2001
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From: Syracuse NY
Still having high idle while coasting...
I have seen others post about this problem a number of times, but I have never seen a solution that works. I have posted before and still no solution.
What happens is that as I approach a stop and put the clutch in and the RPMs stay up near 1400 until the car comes to a complete stop, then the RPMs come down to a normal idle. Lately, it has gotten worse and the RPMs are closer to 2000.
I have cleaned out the throttle-body thoroughly and everything else seems to run perfectly. Also, the butterfly valve is not loose in the throttle body.
Does anyone know what to do to fix it? I just can't seem to figure it out and I have looked at a lot of the archives on this site and no one seems to have a solution.
PLEASE HELP!!!
:smash:
[Modified by jshope, 12:22 PM 10/4/2002]
What happens is that as I approach a stop and put the clutch in and the RPMs stay up near 1400 until the car comes to a complete stop, then the RPMs come down to a normal idle. Lately, it has gotten worse and the RPMs are closer to 2000.
I have cleaned out the throttle-body thoroughly and everything else seems to run perfectly. Also, the butterfly valve is not loose in the throttle body.
Does anyone know what to do to fix it? I just can't seem to figure it out and I have looked at a lot of the archives on this site and no one seems to have a solution.
PLEASE HELP!!!
:smash:
[Modified by jshope, 12:22 PM 10/4/2002]
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Joined: Dec 2001
Posts: 83
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From: Syracuse NY
Re: Still having high idle while coasting...
Ok, to determine whether the car was sensing motion through the ABS system or not, I removed the ABS (brake) fuse and it still did the same thing. The ECM must sense vehicle movement through one of the sensors in the transmission.
Could I have a bad sensor down there?
How about the computer code used to program the ECM? Is that something that I could get my hands on? Then I could figure out why it may be linked to vehicle movement?
Could I have a bad sensor down there?
How about the computer code used to program the ECM? Is that something that I could get my hands on? Then I could figure out why it may be linked to vehicle movement?
Burning Brakes
Joined: Sep 2000
Posts: 1,199
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From: NewCastle IN. USA
Re: Still having high idle while coasting... (jshope)
well I think its kinda normal.
the IAC control's idle, but when you step on the gas the IAC tends to open up more.
once you let off the gas it goes back to normal but a little slowly sometimes.
you may have a IAC going out (getting lazy).
also, the A/C plays a part in this too (higher idle when the pump is on) you probably knew that, what you may not know is, when the defrost is selected the A/C pump cycles on and off (this is to keep the A/C system lubed in the winter time). so if you've got it on defrost that will effect the idle too.
the IAC control's idle, but when you step on the gas the IAC tends to open up more.
once you let off the gas it goes back to normal but a little slowly sometimes.
you may have a IAC going out (getting lazy).
also, the A/C plays a part in this too (higher idle when the pump is on) you probably knew that, what you may not know is, when the defrost is selected the A/C pump cycles on and off (this is to keep the A/C system lubed in the winter time). so if you've got it on defrost that will effect the idle too.
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Joined: Dec 2001
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From: Syracuse NY
Re: Still having high idle while coasting... (ol,RJ)
ol,RJ,
Thanks for the reply. Kinda normal - probably. What I recall it that when I used to put the clutch in, the rpms would drift back to idle, but currently they stay at 1400 (or 2000, depending on the day) for as long as it takes for the car to come to a complete stop) could be 30 seconds sometimes!
Certainly could be a "lazy" IAC. Maybe I'll pop a new one in. It looks like a simple part so it may not be too costly. Thanks.
Thanks for the reply. Kinda normal - probably. What I recall it that when I used to put the clutch in, the rpms would drift back to idle, but currently they stay at 1400 (or 2000, depending on the day) for as long as it takes for the car to come to a complete stop) could be 30 seconds sometimes!
Certainly could be a "lazy" IAC. Maybe I'll pop a new one in. It looks like a simple part so it may not be too costly. Thanks.
Drifting
Joined: Mar 2001
Posts: 1,351
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From: Kingwood TX
Re: Still having high idle while coasting... (jshope)
Is the IAC a common cause for very slight lurching during cruise (foot totally off the accelerator)? In my car it is barely noticeable and I know its nothing big but it would be nice to get rid of it!
