fast idle engine won't slow down - Engine Troubleshooting


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fast idle engine won't slow down

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Les
New User

Jul 2, 2012, 2:03 PM

Post #1 of 3 (2490 views)

fast idle engine won't slow down	Sign In

We have a 2001 Ford Mustang 6 cyl convertible. When you start this motor the tach is at 1500 RPM. This motor will not idle down. It goes down the road at 30 MPH without touching the accelerator. Does anyone have any idea how this can be fixed? We have taken it to 3 different garages including Ford. They tell us this is normal.It eventually slows down , but when you stert it again, it is the same way. Can somebody help?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 2, 2012, 2:05 PM

Post #2 of 3 (2485 views)

Re: fast idle engine won't slow down	Sign In

First eliminate all vacuum or air leaks in the system and make sure the throttle plate isn't sticking. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Discretesignals
Ultimate Carjunky / Moderator
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Jul 2, 2012, 3:46 PM

Post #3 of 3 (2428 views)

Re: fast idle engine won't slow down	Sign In

Check engine light on?

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