Question about 2001 Mercury Grand Marquis

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My 2001 mercury grand marquis with 89k, revs hi and low when the ac or the defrost is on, when they are off the car runs real smooth

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  • Mercury Master
  • 14,585 Answers

This is normal. The PCM kicks up the RPM's when the A/c compressor is on. If the compressor is constantly on and off with the A/C on, check for low freon.

Posted on Apr 18, 2015

  • byrnez75 Apr 19, 2015

    Thanks for the tip I will check the freon level

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Posted on Jan 02, 2017

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justuscc
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SOURCE: 1996 mercury grand marquis gs dash blower switch

heres the electrical diag.....58909880

Posted on Oct 09, 2008

  • 232 Answers

SOURCE: 2001 Mercury Grand Marquis hesitation and jolting from 35-45 mph

Sure, the more the throttle and the longer its open the more gas is being injected so if the spark is not there it will spotter. I think you have nothing to loose with an ignition tune-up. It'll be more economical than taking it to a mechanic and still ending up with the same problem. You should change the fuel filter also it could be clogged and there is'nt enough fuel delivered at these speeds. You can also try a fuel injector cleaning solution the kind you pour in the gas tank. This might work for you.

Posted on May 19, 2009

  • 5 Answers

SOURCE: 1994 Mercury Grand Marquis Check Engine Light Code 332

its the tube going from the egr valve to your exhaust it have carbon build up and you either have to replace it or get a metal coat hanger and clean it out.

Posted on Sep 26, 2009

  • 564 Answers

SOURCE: how to replace starter +1993 Mercury Grand Marquis

disconnect battery,,jack car up,,put jack stand on frame,,take starter bolts out,(may not be easy),,take wires off starter,,hoped it helped,,

Posted on May 08, 2010

  • 1 Answer

SOURCE: 2001 mercury Grand Marquis won't start engine

my mercury grand marquise turns over but wont start what could it be. would a fuse keep it from starting?

Posted on Jul 28, 2012

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2 Answers

I have a 2001 mercury grand marquis ls. it overheats when im driving it but don't shows it on the temperature hand ..what is the problem ??


The temperature switch on the side of the upper radiator hose is not working. That is, if the engine is hot. Boiling over - need to check thermostat. Grab on to upper hose (should be hot) than with engine off, grab bottom radiator hose. It also should be same temperature as top. If so, thermostat ok. Electric radiator fan - turn Ac on. Fans should run. No, check fuses & relay. Mechanical fan - with engine off, the blade should be stiff to turn. Easy, replace fan clutch. Usually, low level of water is most common. Wish you well.

Apr 18, 2017 | 2001 Mercury Grand Marquis

1 Answer

2001 mercury grand marquis idle is low after a dead battery


use a code reader to reset the CPU as battery changes sometimes corrupt the program

Dec 04, 2013 | 2001 Mercury Grand Marquis

2 Answers

Im trying to replace an ac compressor cluth with a bypass but cant find anything that tells me how


The major autoparts stores sell a bracket which uses the same boltholes as the old A/C compressor. It has a free-wheeling pulley and should use the same belt.
There are a few potential problems, I see, which may be noticeable in engine idle speed. When A/C worked, or Defroster, the drag of the compressor running was to be offset by a bump in the RPM to offset drag. You will need to tidy up the loose hoses to keep them from dangling in the engine compartment.

Jun 30, 2013 | 2001 Mercury Grand Marquis

1 Answer

Engine missing are low revs some times


could be a number of things start off cheap spark plugs, wires if you have any next not so cheap coil packs connect directly to spark plug with little boot vacuum leaks hoses that are rotted or loose etcc. good luck

Feb 07, 2010 | 2001 Mercury Grand Marquis

1 Answer

2006 Merc GM, air flow out the defrost only problem.


sounds like a vacuum problem. Check vacuum lines. Maybe hooked up wrong.

Oct 04, 2009 | 2006 Mercury Grand Marquis

1 Answer

Car cant rev up,til it's warm


Clean the MAF sensor with electrical cleaner then blow dry with light shop air or just let air dry.then disconnect battery for about 30 minutes to reset keep alive memory.Should take care of your problem.

Feb 09, 2009 | 1995 Mercury Grand Marquis

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