Main IndexAuto Repair Home Search Posts SEARCH
POSTS 		Who's Online WHO'S
ONLINE 		Log in 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
with_replies.gif image   1989 toyota pickup 3.0 crank no start
I have a 1989 toyota pickup 3.0 crank no...

with_replies.gif image   Strut spring orientation and strut mount tension nut
2017 Nissan rogue awd 2.5 L Put in Monro...

with_replies.gif image   Transmission stuck in part, I have tried everything
So I'm working on my elderly fathers 201...

with_replies.gif image   2017 dodge journey LED headlights on/off randomly
Year of vehicle 2017 Make of vehicle dod...

with_replies.gif image   Kia Soul starter replacement issues!
Okay so my car is a 2010 Kia soul 2.0 en...

hot_with_replies.gif image   Please Help - Knock sound & engine fail
Hi all, Hoping to get some insight and ...

with_replies.gif image   multiple warning lights
2013 GMC Terrain 130,000 miles 4 cylinde...

with_replies.gif image   03 alero no low speed blower
Good day everyone, I have a 2003 Olds a...

with_replies.gif image   04 Chevy 2500hd tail light issues
Help!!! I have changed my combo switch...

with_replies.gif image   1999 Grand Caravan Sport not starting.
Hi. I'm new here. I hope someone can hel...




slight high idling

Search for (search options)
 



mercuryman2003
New User

Apr 25, 2009, 12:07 PM

Post #1 of 4 (1271 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 (1267 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 (1264 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 (1254 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.






 
 
 






Search for (options) Privacy Sitemap