Not shifting when I take off from a stop

Tiny
JASONPYZO
  • MEMBER
  • 1993 CHEVROLET 1500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 170,554 MILES
Hey, how are you guy's? I have a question about my truck. When I take off from a stop or as I merge onto an interstate if I push the accelerator mild to firmly the transmission shifts gears quickly, to the point of where it kind of bogs down the engine. So I was wondering if it is something that requires like a transmission overhaul given the miles on it or maybe something dealing with the valve body or something. I would appreciate any advice you would have on this matter. Thanks, Jason
Thursday, March 29th, 2018 AT 12:18 PM

6 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good morning.

Have your throttle position sensor checked. That is the sensor that controls shift points. It should have a smooth sweep from zero to five volts.

Beyond that, it could be valve body. Before assuming it may need an overhaul I would change the transmission oil and filter first.

Roy
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Friday, May 14th, 2021 AT 11:23 AM
Tiny
JASONPYZO
  • MEMBER
  • 87 POSTS
Alright, the TPS was replaced last year for low reading, but I will check it again. I replace transmission fluid around every 30,000 miles and it has been 8,000 since last change, so that being said, do you think I should get a diagnostic on transmission if TPI is fine?
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Friday, May 14th, 2021 AT 11:23 AM
Tiny
JASONPYZO
  • MEMBER
  • 87 POSTS
I replace transmission fluid and filter, forgot to mention the filter.
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Friday, May 14th, 2021 AT 11:23 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Check the TPS voltage. Even though it is a year old, it can still be bad.

Roy
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Friday, May 14th, 2021 AT 11:23 AM
Tiny
JASONPYZO
  • MEMBER
  • 87 POSTS
Alright I appreciate that, out of town right now so I will check when I get back around the way and get back with you. Thanks again.
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Friday, May 14th, 2021 AT 11:23 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
You are welcome. Keep me updated.

Roy
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Friday, May 14th, 2021 AT 11:23 AM

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