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Gears changes at high rev's

Tiny
MBIR
  • MEMBER
  • 2002 HYUNDAI SANTA FE
  • 2.4L
  • V6
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
The gears changes at high rev that is 4000 from one, two and three then stay there cannot go fourth gear but changes correctly manually.
And during an overtaken it used to pick up top gear for faster acceleration but that too is no more.
Tuesday, December 20th, 2016 AT 10:49 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
Hey MBIR ,

It sounds like you may have a catalytic converter that is starting to plug up. What happens is the vacuum is low in the engine becasue of the plug so the computer thinks you are going up a big hill making the transmission shaft later. Here is a guide to help see if the cat is the problem.

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

Please run this test and get back to us so we can continue helping you.

Best, Ken
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Saturday, December 24th, 2016 AT 1:54 PM
Tiny
MBIR
  • MEMBER
  • 18 POSTS
I changed the convertor but it was a metallic honey comb not breakable type.
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Monday, December 26th, 2016 AT 9:04 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure first yo may have a tcm problem or valve body problem as well as a seal/clutch pak bad or even a roller clutch bad in trans.
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Monday, December 26th, 2016 AT 9:42 AM
Tiny
MBIR
  • MEMBER
  • 18 POSTS
Can you please explain in plain English
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+1
Wednesday, December 28th, 2016 AT 2:07 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Tcm is transmission control module and valve body is inside transmission or internal transmission problems
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Wednesday, December 28th, 2016 AT 3:17 PM

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