fast idle engine won't slow down - Engine Troubleshooting


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

Strut spring orientation and strut mount tension nut

2017 Nissan rogue awd 2.5 L Put in Monro...

Transmission stuck in part, I have tried everything

So I'm working on my elderly fathers 201...

2017 dodge journey LED headlights on/off randomly

Year of vehicle 2017 Make of vehicle dod...

Kia Soul starter replacement issues!

Okay so my car is a 2010 Kia soul 2.0 en...

Please Help - Knock sound & engine fail

Hi all, Hoping to get some insight and ...

multiple warning lights

2013 GMC Terrain 130,000 miles 4 cylinde...

03 alero no low speed blower

Good day everyone, I have a 2003 Olds a...

04 Chevy 2500hd tail light issues

Help!!! I have changed my combo switch...

1999 Grand Caravan Sport not starting.

Hi. I'm new here. I hope someone can hel...

Brake Seals Bulging

2021 Toyota Corolla LE 1.8l 65,000 mile...

fast idle engine won't slow down

Sign up here!

Search for (search options)

Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

Les
New User

Jul 2, 2012, 2:03 PM

Post #1 of 3 (2485 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 (2480 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.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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
Discretesignals profile image

Jul 2, 2012, 3:46 PM

Post #3 of 3 (2423 views)

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

Check engine light on?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

Search for (options) Privacy Sitemap