Not shifting when I take off from a stop

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

6 Replies

ASEMASTER6371

MECHANIC
52,797 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

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

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

ASEMASTER6371

MECHANIC
52,797 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

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.

Not shifting when I take off from a stop

6 Replies

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