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

1998 TOYOTA SIENNA
109,870 MILES • V6 • FWD • AUTOMATIC
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AMANDADA
  • MEMBER
  • 1 POST
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
Jan 23, 2015 at 7:51 PM
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HMAC300
  • ✓Experienced 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.
Jan 23, 2015 at 10:00 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,224 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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