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Will not accelerate

Tiny
LEVISMOM19
  • MEMBER
  • 2008 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 149,000 MILES
Drove my car to my parents an hour away I was going eighty speed limit was seventy. When I got almost there my car would not accelerate it kept steady at seventy five. I checked my car it was completely out of coolant so I filled it and it had no leaks or no codes, then it drove home fine. Next day it drove it but then it would not accelerate again, but this time it was at sixty mph. It drives fine on regular forty mph roads. I am not sure what the issue is.
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Monday, September 4th, 2017 AT 2:33 PM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,692 POSTS
It sounds like your catalytic converters are getting plugged up which causes low power at higher speeds.

Here is a guide to help us confirm the failure so we can get it fixed:

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

and if bad here is a guide to give you an idea on how to replace it:

https://www.2carpros.com/articles/catalytic-converter-replacement

Please let us know what happens and upload pictures of the problem.

Cheers, Ken

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Tuesday, September 5th, 2017 AT 3:52 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,480 POSTS
I would bet it has a bad head gasket as well. That is why your coolant is going away, the engine is burning it and causing the converter to become plugged with the additives in the coolant. I would get it to a shop and have them run some tests to find the problems before the engine is so bad it needs to be replaced.
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Wednesday, September 6th, 2017 AT 2:33 AM

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