Question about 1997 Ford Thunderbird LX

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I am having a problem with the Transmission shifting. The transmission is not at fault. The Mechanic seems to think the problem is electrical originating from the PCM module. Any answers?

The Transmission switch was cleaned and even replaced. The first shift is very hard, but afterwards it is very smooth. The green overdrive light on the dashboard goes off and on while the car is being driven. The check engine program shows a speed sensor problem.

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  • Contributor
  • 9 Answers

I would think that the speed sensor is the problem from past exp

Posted on Nov 21, 2014

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Posted on Jan 02, 2017

dddsouve
  • 64 Answers

SOURCE: 1996 TBird 4.6 auto/overdrive trans problem

Your transmission fluid contain water,thats why the colour of the fluid changed to pink.And of such the clutch is slipping causing the engine to reve up before shifting - Check transmission cooler.

Posted on Aug 21, 2008

michigan man
  • 3533 Answers

SOURCE: '89 f150 4x4 AOD doesn't like overdrive

get the truck where you can service it and have a transmission service done this will include: new fluid and transmission filter
because it sounds as if it has not been changed in awhile open the hood and if the transmission fluid smells cooked change it right away

Posted on Jan 06, 2009

  • 1114 Answers

SOURCE: 2002 Ford F150 5.4L hard shifting

Have you ever changed the transmission fluid flush and replaced the transmission filter?

Posted on Jan 11, 2009

emissionwiz
  • 75822 Answers

SOURCE: transmission slipping

do u have any transmission trouble codes? u should if the OD light is flashing, the light flashes to alert u that a electronic malfunction is occurring in the trans controls, u may just have a bad trans connector or a shift solenoid starting fail due to a shorted field closing coil.

Posted on Feb 02, 2009

  • 1 Answer

SOURCE: transmission shifts hard ,overdrive light flashes

I had a similar problem which turned out to be caused by a leaking vacuum line.

Good luck!
Brent

Posted on Apr 11, 2009

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Hello
1st let me explain how the transmission in this car is shifted, there is a computer control module, it is called the "Powertrain Control Module" or PCM, some cars have a separate computer that is just for the transmission, this is a TCM, your cars PCM does both jobs of running the engine and shifting the transmission. The actual shifting is done by electric solenoids inside the transmission which the PCM controls by grounding them, when the computer determines it is time to shift based on vehicle speed and transmission fluid temperature and other inputs from the engine sensors it grounds the proper solenoid that shifts the transmission up or down to the appropriate gear, it monitores the shift electronically and if it doesn't see that the transmission has done what it was commanded to do it sets a fault code in its memory. I have read your problem and no mention is made that "Your Mechanic" scanned the system for fault codes, if he did and nothing shows up then you have a mechanical fault in the transmission and it will need to be torn down and rebuilt to correct this shift problem.
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