Rough idle

2001 MITSUBISHI GALANT
189,000 MILES • 2.4L • 4 CYL • FWD • AUTOMATIC
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CANDACE LEWIS BREWER
  • MEMBER
  • 2 POSTS
My car will start, but irregular idle then does. I have had the MAF Sensor, all sensors changed basically. No vacuum leak. Any new ideas?
Sep 1, 2016 at 3:19 PM
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SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
Have you checked for codes in the computer yet?
Sep 1, 2016 at 3:42 PM
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CANDACE LEWIS BREWER
  • MEMBER
  • 2 POSTS
Yes, also used throttle cleaner on it. Im about ready to sell it, this would be a mechanics dream.
Sep 3, 2016 at 8:26 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,583 POSTS
I would start with a compression test to see if you have a low cylinder. You could have a intake valve leaking.

Here is a guide that will show you how to test it.

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

Best, Ken

Sep 5, 2016 at 2:49 AM
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