Grand Marquis Shuttering

mercury
#1

Hey there.



I own a 1991 Mercury Grand Marquis. 71k original miles. Runs and rides great, but it has developed a shutter. Heres when it happens. I slow down to take a turn or something and as I re-apply the gas after the turn, the car shutters rather violently. The car then upshifts and the shutter is gone. Seems to me like the transmission is getting stuck in a high gear and lugs the engine when I re-apply the gas. The take good care of the car. The transmission fluid is not low at all and has a good pink/red color. Any idea what it could be and if its worth fixing?



On a related question, lets say the repair costs more than 500 to fix, more than the value of the car. Do you think it is worth keeping a 1991 grand marquis with low miles that can arguably run for 50k more miles with general maintenance or should I just sell it and get a newer car with more miles?



Thanks for the help, folks. I appreciate it.



-Mike

#2

From what you describe, it sounds like the torque converter clutch is failing to disengage. This could because of a sticking torque converter clutch solenoid. It sounds like you don’t want to put too much money into this car. So, you might try adding a half a can of SeaFoam Trans-Tune to the transmission fluid. The stoddard solvent in the SeaFoam might be enough to desolve the gum and varnish that may be causing the solenoid to stick.

Tester

#3

Ah, alright, the torque converter clutch. I’ll give the additive a try and see what happens. I can’t really go wrong. It may be a cheap temporary fix. Thanks for the reply.