Question about 2001 Mercury Grand Marquis
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
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:
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
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
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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