Car has poor acceleration/shifts rough

2007 KIA RIO
75,000 MILES • 4 CYL • 2WD • AUTOMATIC
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CHARLIE85
  • MEMBER
  • 1 POST
Coil packs 1,3,4 were changed out, new spark plugs and new MAP sensor and car still has no acceleration. It will start and idle good,rev up good in park and neutral.
Apr 20, 2020 at 5:03 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good afternoon,

I would suspect either a timing issue or a cat converter issue.

https://www.2carpros.com/articles/engine-has-low-power-output

https://www.2carpros.com/articles/symptoms-of-low-engine-power

You should do a compression test. It will tell me if the timing belt is the issue.

https://www.2carpros.com/articles/how-to-test-engine-compression

A back pressure test on the exhaust system will confirm if the catalytic converter is clogged.

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

Roy
Apr 20, 2020 at 7:00 AM
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