# Grand Marquis Shuttering

**URL:** <https://community.cartalk.com/t/grand-marquis-shuttering/23414>\
**Category:** Maintenance/Repairs\
**Tags:** mercury\
**Created:** [December 14, 2008, 11:17pm UTC](https://community.cartalk.com/t/grand-marquis-shuttering/23414 "2008-12-14T23:17:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![MykeyInChains](https://avatars.discourse-cdn.com/v4/letter/m/977dab/32.png) [@MykeyInChains](https://community.cartalk.com/u/MykeyInChains)\
**Post date:** [December 14, 2008, 11:17pm UTC](https://community.cartalk.com/t/grand-marquis-shuttering/23414/1 "2008-12-14T23:17:45Z")

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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

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [December 14, 2008, 11:31pm UTC](https://community.cartalk.com/t/grand-marquis-shuttering/23414/2 "2008-12-14T23:31:34Z")

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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

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**Author:** ![MykeyInChains](https://avatars.discourse-cdn.com/v4/letter/m/977dab/32.png) [@MykeyInChains](https://community.cartalk.com/u/MykeyInChains)\
**Post date:** [December 14, 2008, 11:38pm UTC](https://community.cartalk.com/t/grand-marquis-shuttering/23414/3 "2008-12-14T23:38:45Z")

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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.