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Mercury
Marquis
Engine
Symptoms
Idle High
Idles high when put in park only
TRACEY MCMORRAN
MEMBER
1992 MERCURY MARQUIS
4.6L
V8
2WD
AUTOMATIC
95,000 MILES
Idle okay in gear. What is causing this?
Thursday, January 3rd, 2019 AT 11:27 AM
1 Reply
DANNY L
MECHANIC
5,648 POSTS
Hello, I'm Danny.
It sounds like you might be having an issue with the idle air control valve.Here is a tutorial showing what is involved:
https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac
Hope this helps and thanks for using 2CarPros.
Danny-
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Thursday, January 3rd, 2019 AT 6:51 PM
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