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Idles very high


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Grandpacisco
New User

Jun 24, 2010, 7:56 AM

Post #1 of 5 (1652 views)
Idles very high Sign In

My 1997 Mercury Cougar, XR7, 4.6 LT, V-8, 148000 MI, Idles at 2000 RPM, and when engaged in Drive it runs up to 40 MPH without accelerating. Please advise. Thank you, Grandpacisco.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 24, 2010, 8:54 AM

Post #2 of 5 (1644 views)
Re: Idles very high Sign In

Is the check engine light coming on at all?



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Grandpacisco
New User

Jun 25, 2010, 11:54 AM

Post #3 of 5 (1636 views)
Re: Idles very high Sign In

I have been driving the cougar with the engine light on, for about thre years. I spent near $ 3000 dollars between dealers an small shop mechanics, and the engine light is still coming on


Sidom
Veteran / Moderator
Sidom profile image

Jun 25, 2010, 8:02 PM

Post #4 of 5 (1634 views)
Re: Idles very high Sign In

Wow.....I really don't have a good answer for that....

As far as you high idle, those had a problem with the IAC motors, the diaphram would split causing a high idle...

As quick check, take the iac off ( 2 bolts), block off both ports with cardboard & put the iac back on, if it now idles too low & almost dies, the problem is in the circuit or bad motor.............


Grandpacisco
New User

Jul 2, 2010, 1:48 PM

Post #5 of 5 (1615 views)
Re: Idles very high Sign In

I replaced the IAC, now it idles about 1500 RPM. I have put in a full tank of gas a fuel system cleaner. Please would somebody advice what else to do. Thank you


(This post was edited by Grandpacisco on Jul 7, 2010, 6:42 PM)






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