1997 Mercury Grand Marquis Logo
Frank Arduengo Posted on Apr 09, 2014
Answered by a Fixya Expert

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Overdrive light flashing

When im driving out of nowhere my o/d light starts blinking on and off and my car starts to act weird like if my transmission is slipping it even looses power and dont want to pass 30 miles

1 Answer

Daryl Gleaton

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  • Master 749 Answers
  • Posted on Apr 09, 2014
Daryl Gleaton
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This could be caused by a multitude of things. The maf sensor, need of tuneup, clogged filter in transmission. Hilly roads will cause the car to shift up and down when in overdrive. What is the history of your maintenance on this vehicle. Was it serviced at regular intervals, by an experienced mechanic? Good luck!!! More info. and I should be able to tell you whats going on.

5 Related Answers

Anonymous

  • 1129 Answers
  • Posted on Jul 14, 2009

SOURCE: transmission slipping and other things all started at once

Check the transmission fluid it may be in need of a quart of transmission fluid

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Arnie Burke

  • 7339 Answers
  • Posted on Sep 10, 2009

SOURCE: 1999 Mercury Sable 55,000 miles ....will not move .

is fluid red,does it smell burnt,hav gritty feel-u may need a flush--the trans is partly electronic so keep computer issues in mind--automatics r really complicated and a moving part could be bad-mite test it at a honest shop

fordexpert

  • 5692 Answers
  • Posted on Mar 19, 2010

SOURCE: I have two problems with my 98 Murcury Grand

Believe it or not I had to replace an alternator in my Lincoln with a digital dash. It had a speedo giving crazy readings too.

You can get a free scan at Autozone or Oreillys to check the Alternator and the rest of your car. It may solve your O/D problems too. There is a speed sensor in some of the rear axles. It could be loose and cause the same problems.

Anonymous

  • 156 Answers
  • Posted on Aug 22, 2010

SOURCE: my 1994 cougar 3.8 overdrive

Well since the car engages the gears are probably good. The first thing i would suggest is to change the transmission filter and oil out and see if that makes it go away. If that doesn't work then there is more than likely a problem with your transmission and would be hard to pinpoint if it were just a sensor or something deeper. Wish i could be of more help!

Stoney Thompson

  • 440 Answers
  • Posted on Nov 30, 2010

SOURCE: Hi there. My '03 AWD

I know is not what you would like to hear around the holidays, but.... a lot of times when the overdrive flashes, there is a mechanical problem, most likely in your case lockup in the torque converter. i would say it would be a good idea to get it to a garage asap, to save yourself from any other damage that will cause you to do a complete rebuild.

Testimonial: "Thanks for the info and the quick response."

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