'01 Idle speed issue...
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Mountain Pass
Joined: May 2014
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'01 Idle speed issue...
I have a 2001 Ford Escape. When started cold, it revs up to abt 3000 rpm. Slowly drops back to about 1000 in abt 10 secs. When the engine is hot, it often wants to idle 2500+ rpms and I have to really step on the brakes to slow the vehicle. When I disconnect the IAC the engine dies. When it is rev'ing high, I can disconnect and reconnect the IAC quickly, and the idle will drop back down for a few minutes, until I step on the accelerator, then start climbing again. It seems to be a lot worse when hot.
I replaced the IAC and TPS about 20k miles ago and thought it was fixed, but the problem has returned. At that time, I could tap on the IAC and it would "get well" for a while. Tapping on this one doesn't seem to change anything.
No CEL, engine runs smooth, and I don't notice any air leaks (none that I've found, at least).
Any ideas?
Dave
I replaced the IAC and TPS about 20k miles ago and thought it was fixed, but the problem has returned. At that time, I could tap on the IAC and it would "get well" for a while. Tapping on this one doesn't seem to change anything.
No CEL, engine runs smooth, and I don't notice any air leaks (none that I've found, at least).
Any ideas?
Dave
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Mountain Pass
Joined: May 2014
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Hi, I used a IAC from NAPA. I had read everything I could find on this site, and noticed that others had probs with aftermarket IACs as well. Wondering if I should pick up a Ford replacement and give it a try. If I unplug the IAC, the engine stalls, but the odd thing is where I can unplug and reconnect it quickly (before the engine stalls), things seem to return to normal until I rev the engine again.
Logistics Pro
Joined: Jan 2002
Posts: 4,907
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From: suburban atlanta
You can try cleaning the IAC you have. From the description, it is being commanded to lower the idle, but is hanging until all power is removed, then when power is applied, it moves. I would remove it and try some cleaner. Don't spray cleaner into the intake unless it labeled is 'safe for converters'.
tom
tom
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Mountain Pass
Joined: May 2014
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You can try cleaning the IAC you have. From the description, it is being commanded to lower the idle, but is hanging until all power is removed, then when power is applied, it moves. I would remove it and try some cleaner. Don't spray cleaner into the intake unless it labeled is 'safe for converters'.
tom
tom
Dave
Posting Guru
Joined: Feb 2002
Posts: 1,534
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From: Warren, MI
Probably since it's PWM(pulsed 12V) for accurate control so it's on/off/on/off, etc. many times per second.
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Mountain Pass
Joined: May 2014
Posts: 101
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Thanks Bill, makes sense. I'm gonna pick up a Ford part tomorrow. There's a NAPA unit on it now. Seemed to be OK for about 20k miles, and now it's misbehaving.
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