High Idle on a 1985 Grand Marquis
50

Asked by Crestline_782 Jan 15, 2017 at 08:48 PM about the 1985 Mercury Grand Marquis

Question type: Maintenance & Repair

So , I just bought a 1985 Grand Marquis from someone and it won't idle down.
I was wondering does anyone happen to know why or has had that problem
before?

1 Answer
104,115

KenF answered 8 years ago

Most common cause is vacuum leak, I believe you also have a vacuum advance on the distributor, that can also cause an idle to remain high.

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