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Mercury
Marquis
Engine
Symptoms
Idle High
Idles high when put in park only
1992 MERCURY MARQUIS
95,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
TRACEY MCMORRAN
MEMBER
4 POSTS
Idle okay in gear. What is causing this?
Jan 3, 2019 at 3:27 AM
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DANNY L
✓
Experienced 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-
Jan 3, 2019 at 10:51 AM
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