Gears changes at high rev's

2002 HYUNDAI SANTA FE
200,000 MILES • 2.4L • V6 • 4WD • AUTOMATIC
Avatar
MBIR
  • MEMBER
  • 18 POSTS
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.
Dec 20, 2016 at 10:49 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,872 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
Dec 24, 2016 at 1:54 PM
Avatar
MBIR
  • MEMBER
  • 18 POSTS
I changed the convertor but it was a metallic honey comb not breakable type.
Dec 26, 2016 at 9:04 AM
Advertisement
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 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.
Dec 26, 2016 at 9:42 AM
Avatar
MBIR
  • MEMBER
  • 18 POSTS
Can you please explain in plain English
Dec 28, 2016 at 2:07 PM
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
tcm is transmission control module and valve body is inside transmission or internal transmission problems
Dec 28, 2016 at 3:17 PM