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slight high idling

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mercuryman2003
New User

Apr 25, 2009, 12:07 PM

Post #1 of 4 (1272 views)
slight high idling Sign In
I have a 2003 Mercury Grand Marquis with 46k miles. Runs well but it idles noticebly higher after running a few miles. I put my hand on the cover that has the V8 logo and can feel strong engine vibrations. There is no RPM dial in the dashboard inside the car. What should I look at to lower the idling?

Thanks


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 25, 2009, 12:16 PM

Post #2 of 4 (1268 views)
Re: slight high idling Sign In
The idle on your car is completely controlled by the computer and is not adjustable at all.

If it appears to be idling too high you want to look for thinks like vacuum leaks or binding linkage. If you can eliminate those things positively then 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.



(This post was edited by Hammer Time on Apr 25, 2009, 12:16 PM)


mercuryman2003
New User

Apr 25, 2009, 2:01 PM

Post #3 of 4 (1265 views)
Re: slight high idling Sign In
   

Thanks for the info. Is there a link that would shows the throttle and IAC?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 25, 2009, 3:53 PM

Post #4 of 4 (1255 views)
Re: slight high idling Sign In
Here's what the IAC looks like. It's bolted to the side of the intake.






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

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.






 
 
 






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