Revving and acceleration problem

Tiny
MSIUTA84
  • MEMBER
  • 2002 HYUNDAI ELANTRA
  • AUTOMATIC
  • 142,000 MILES
Hi, I am having trouble with my car. I cannot seem to accelerate past ten mph and the rpm's will not go past 2. Can anyone help me with this? I took the car to a mechanic shop and they advised me to change the speed sensor but still having the same issue.
Wednesday, December 13th, 2017 AT 6:19 AM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Is the Check Engine Light on and have you checked for trouble codes?
If you don't have any problem with above, I would suggest checking for a plugged exhaust system.
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Friday, December 15th, 2017 AT 6:43 AM
Tiny
MSIUTA84
  • MEMBER
  • 4 POSTS
The check engine light is off. According to mechanic there was no check codes.
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Friday, December 15th, 2017 AT 6:45 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Then you should check for a plugged exhaust system. If the exhaust system is clogged, exhaust gases are not able to escape and that would restrict engine speed.

Are the gears able to up or down shift?
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Friday, December 15th, 2017 AT 7:07 AM
Tiny
MSIUTA84
  • MEMBER
  • 4 POSTS
Yes the gears are able to shift up and down. But the car only goes about 10 mph
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Friday, December 15th, 2017 AT 7:28 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
While stopped and transmission in P or N, are you able to rev up the engine and at what rpm does it maxed out?
Is the throttle opening fully? Did you check the throttle cable adjustment?
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Friday, December 15th, 2017 AT 7:42 AM
Tiny
MSIUTA84
  • MEMBER
  • 4 POSTS
The rpm maxed out at 2 while in park. I haven't checked the throttle cable adjustment. Not really sure where to look for that as I know nothing about cars.
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Friday, December 15th, 2017 AT 7:45 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
https://www.2carpros.com/articles/throttle-actuator-service

Go to above link for an idea what to look for
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Friday, December 15th, 2017 AT 7:49 AM

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