Rpm's don't come down, cold start. - Mustang Evolution

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Old 11-14-2014, 12:42 PM   #1
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Rpm's don't come down, cold start.

Ever since it got cold (~20 degrees F) my car idles at 1500 for a long time.

I understand that the car idles high for a short amount of time, but I waited 10 minutes before I was like "f**k this" and just put it in gear.

Here is where things get interesting, as soon as I throw it and gear and let out the clutch the car idles down to 800 where it should be. It is mocking me..

Do I have to pull the battery and re-learn the idle? If I have to set my 16 band EQ on my stereo again I won't be a happy camper.


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Old 11-14-2014, 12:51 PM   #2
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It's either that or skip right to replacing the IAC with a new Motorcraft part. You're going to have to disconnect the battery either way so you may as well try the idle relearn procedure first.
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Old 11-14-2014, 01:20 PM   #3
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Where is the IAC valve on the 3v? I thought since the throttle was electronic it would just flip it open a bit, eliminating the need for a iac valve.

I notice with the car set to on (not running) I get this really sickly sounding "hum" coming from the throttle body when I push the gas pedal down. Something probably is going out there.

Guess I'll be disconnecting the battery, re-running auto EQ, and then tweaking it again. Bummer.


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Old 11-14-2014, 01:33 PM   #4
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Lol.
Sorry about that!
You are correct. The whole throttle body needs to be replaced if there is a problem.
I'd definitely try the idle relearn!
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Old 11-14-2014, 02:03 PM   #5
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Will do! I'll report back after try the relearning process.

Does your tb a pretty nasty sounding hum when you push the pedal down with the key in it?

If my tb is bad it gives me an excuse to go aftermarket, right? :p


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Old 11-14-2014, 02:21 PM   #6
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I have an 01 so it has a throttle cable.
If it's making a nasty noise that it wasn't making previously, chances are that it is malfunctioning. If so, yes, this will be a perfect time to upgrade!
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Old 11-14-2014, 04:00 PM   #7
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I can't remember if it was or not. The only reason I ever pushed the pedal down with the car set to on was to clean the throttle body. I couldn't manually move the plates.

Hmmm, after I cleaned the throttle body it started to idle high. I cleaned out a ton of crud. Maybe I do need to relearn.

I have a second. I'm gonna go drive the car to get it up to temp and then do the idle relearn


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Old 11-14-2014, 10:54 PM   #8
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Yup it worked. Relearned the idle and wouldn't you know it. The rpms drop down with in a minute now.

Throttle body still makes a funky mechanical noise. I expect that to go out on me fairly quickly. No doubt at the worst possible time leaving me stranded somewhere, so I'll be ordering a replacement asap


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Old 11-14-2014, 11:02 PM   #9
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I know that some people do it a couple of times a year, when the seasons change.

Glad you got it fixed!
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