Question about 2001 Mercury Grand Marquis

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I just bought this 2001 grand marquis, the problem im having started as a small vibration when the transmission was shifting between 3-4th gear in overdrive up hill well now a few weeks later my car is shaking between any gear and at highways speeds it started shaking severly so bad im afraid to drive it tomorrow as I don't want to make the problem any worse or get stranded, also one side not the shaking will go away briefly if I accelerate or decelerate but only breifly (I belive its between gears but not sure as do not have a tachiometer)

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  • Joe Russell
    Joe Russell Oct 17, 2013

    Sorry for the spelling mistakes. *on a side note

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  • Mercury Master
  • 5,470 Answers

As a test, you can switch the overdrive OFF with a push of a button. The engine will run at higher RPM so test it under 55MPH.

I am thinking about your comment of "One side shaking". This sounds more like a loose wheel or dragging out of round front rotor. Then when you comment about the vibration stopping briefly when accelerating or decelerating, that's a lot like U-joint play. The U-joint has play and tightens at the extreme edge of its mount as it rocks from Torque direction changes.

I would say to have an Alignment shop check the front suspension and driveshaft. These inspections are not something a beginner should do.

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

greg_margo
  • 1959 Answers

SOURCE: Transmission hesitates shifting into second and perhaps third gear when driving slow. When acceleration is positive transmission shifts smoothly. Reference "99 Mercury Transmission" as Subject when

Several things could be causing your problem:

  1. Auto transmission fluid is low
  2. Auto transmission fluid needs changing; this is an area that gets neglected by a lot of people;check the fluid and if its brown or gives off a burning smell, it needs changing. Very old transmission fluid will cause slipping in the transmission; if this is the case, it should be changed along with the filter
Hope you find that this answers your question. Best of luck.
Greg

p.s. If you have the fluid changed, make sure it's done from the tranmission pan, not through the filler tube; siphoning through the filler tube can be hazardous to the transmission, especially cars with a lot of miles

Posted on May 30, 2009

  • 176 Answers

SOURCE: My 1990 Mercury Grand Marquis won't shift into

The first thing you need to check is the Throttle Valve Cable. This cable runs from the throttle body to the transmission and controls gear changes according to throttle position. It may have come disconnected from the throttle lever, or could even be stuck in a "wide-open" position. If this cable is okay then there is a real good chance that the direct clutches have failed. This clutch pack is used in 3rd and 4th gears.

Posted on Jan 22, 2011

emissionwiz
  • 75051 Answers

SOURCE: my 2001 grand marquis hestitates and shutters slighty when downshifting from 4th to 3rd gear, shutting off overdrive eliminates problem

The first thing to do here is to have the transmission fluid changed, the shudder is torque converter clutch chatter, just like a burned clutch in a manual transmission car. The new fluid renews the anti friction additives and in most cases eleiminates the problem, have the transmission flushed so all fluid is replaced.

Posted on Jun 06, 2012

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