Question about 1985 Mercury Grand Marquis

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FAST IDLE SPEED ADJUSTMENT ON A 1985 MERCURY GRAND MARQUIS COLD IDLE SPEED IS VERY FAST AND WARM IDLE SPEED IS SLIGHTLY FAST

COLD IDLE SPEED IS VERY FAST

Posted by MIKE LENARTOWICZ on

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calvin strickland

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Idles fast you have a small vacuum leak

Posted on Dec 19, 2017

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Bogdan Odwazny

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Do you have any codes? Did you change an air filter?

Posted on Apr 04, 2017

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1 Answer

Engine idling fast


The most common reasons for a high idle speed is a sticking throttle, vac leak, or a faulty idle air bypass valve. The computer uses the valve to control idle speed.

May 12, 2013 | 1991 Mercury Grand Marquis

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2001 mercury grand marquis sputtering like it doesnt know which gear to be in when maintaining certain speeds, slight odor of gas in oil?


Is the check engine light on ?
Fuel in the oil could be a faulty injector or the fuel pressure regulator.

Feb 26, 2013 | 2001 Mercury Grand Marquis

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Replaced tps and the car will not sped up on fast idle when cold.


have a throttle body service to included the air flow sensor

Nov 23, 2012 | 1997 Mercury Grand Marquis

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I have a 1993 mercury grand marquis and reverse doesn't work after it warms up. It does work when cold.


You can check with a local transmission shop, but usually the problem is a worn band or a weak pump. The reverse band also affects low gear.
There may also be a solenoid involved.

Sep 15, 2012 | 1993 Mercury Grand Marquis

1 Answer

Stalls til warm


You might try an ECT switch which is a switch that works with the water temperature. When cold the switch will adjust the motor to go into a "cold start" mode and enrich the fuel and speed up the idle till warm.
Try Autozone or similar for part and location of the part.

Aug 11, 2009 | 1999 Mercury Grand Marquis

1 Answer

Car won't idle without revving when cold and dies when in drive


This Vehicle needs an Idle air control/Idle speed motor. Good Luck

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1 Answer

92 grand marquie stalls at idle engine light comes on


I would venture to guess that your TPS has malfunctioned. The idle holds when the engine is cold correct?

Nov 12, 2008 | 1992 Mercury Grand Marquis

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