Transmission

168,000 MILES • 6 CYL • 2WD • AUTOMATIC
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WILLIAM WHITNEY
  • MEMBER
  • 3 POSTS
Transmission slams in first few gears then will not go in overdrive. No check engine light but transmission light flashes.
Aug 10, 2017 at 6:39 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,553 POSTS
Hello,

It sounds like you have a one of two problems, the first will be a plugged catalytic converter which will cause the vacuum of the engine to be low and make the transmission shift late and not go into overdrive.

Here is a test that will confirm the problem,

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

The other would be a MAF sensor that is off. I would try cleaning the sensor first. Here is a guide for that as well.

https://www.2carpros.com/articles/mass-air-flow-service

This will cause the readings to the computer to be off and cause the same problem.

Please let us know what happens.

Cheers, Ken



Aug 14, 2017 at 2:13 AM
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WILLIAM WHITNEY
  • MEMBER
  • 3 POSTS
Thanks, I will give both of them a try!!
Aug 14, 2017 at 9:02 AM
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WILLIAM WHITNEY
  • MEMBER
  • 3 POSTS
Cleaning the MAF didn't work will try the cat next .
Aug 15, 2017 at 6:32 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,553 POSTS
Okay, that will cause the problem. Let me know

Aug 16, 2017 at 3:28 AM
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