Question about 1995 Buick LeSabre

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Transmission won't shift into 4th

Engine has 113,000 and runs fine through 3rd but won't shift into 4th.

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  • Buick Master
  • 987 Answers

Check fluid condition first if good check for linkage and selector switch positions, also possible shift soloniod problem, if fluid is burned or smells burned you will need to remove trans for repair

Posted on Apr 13, 2014

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Posted on Jan 02, 2017

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SOURCE: I have a 1992 Buick Reviera that won't shift into

you will need to replace the 3-4 shift solenoid inside the tranny - either it works or doesn't - alternatively it could be the wire... not a big deal, but the shops charge for that..

Posted on Mar 06, 2011

  • 192 Answers

SOURCE: I have a 1995 Buick

Fourth gear in your vehicle doesn't exist. What feels like a fourth gear is the torque converter locking up. The lockup lockup is controlled by a solenoid in the side pan of the transmission, and the solenoid is controlled by the ECM (electronic control module) in response to several pressure, temperature and speed sensors etc. To determine which component is the problem you'll need a professional transmission mechanic with the proper diagnostic equipment.

Posted on Jun 28, 2011

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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.
My experience is 25 years as a Ford factory trained repair and diagnosis technican.

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