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Rough idle and misfire

Tiny
JASON POND
  • MEMBER
  • 2004 MITSUBISHI ENDEAVOR
  • 3.8L
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 175,000 MILES
When my car warms up it has a rough idle and misfire. Check engine light does not come on. The misfire is worse when A/C is on. I can drive to work witch is about four miles car runs fine by the time I pull in the parking lot it has a rough idle and misfires. I have changed the plugs and check for vacuum leaks. Please help, thanks.
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Thursday, August 24th, 2017 AT 9:10 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,258 POSTS
It sounds like you have low compression in one or more cylinders. Lets start with a compression test.

Here is a guide that will help you get the job done:

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

If you do not have a gauge you can rent one for free from the local auto parts store.

Please let us know what you find.

Cheers, Ken
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Friday, August 25th, 2017 AT 1:14 PM

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