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When I tried to speed it up the gear goes up and down?

Tiny
AMANDADA
  • MEMBER
  • 1998 TOYOTA SIENNA
  • V6
  • FWD
  • AUTOMATIC
  • 109,870 MILES
When ascending hill it slows down and when I tried to speed it up the gear goes up and down again and again. As if the gear wants to engage a higher gear it drops back to the lower gear and it repeats cycle. Please I need your help. Thanks
Saturday, January 24th, 2015 AT 3:51 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes but I don't think much is wrong with it. Hills will do that. It may also be age of car.
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Saturday, January 24th, 2015 AT 6:00 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hmm, I have seen the input shaft speed sensor get weak and cause this issue or the catalytic converter is partially clogged up, this guide can help with testing the cat and I have included the input shaft speed sensor location in case you want to swap it out.

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

They call it a #2 shaft speed sensor. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.

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Thursday, September 19th, 2024 AT 3:36 PM

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