Engine misfire

2006 KIA OPTIMA
162,245 MILES • 2.4L • 4 CYL • 4WD • AUTOMATIC
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LYNNIEBROWN
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  • 1 POST
In park or at a light the car is vibrating and misfiring. The spark plugs coil packs and fuel injectors has been changed the check engine light came on for forty five minutes giving a p0301 code and then it went off. What would cause my car's engine to misfire?
Oct 10, 2017 at 9:16 AM
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MHPAUTOS
  • CAR REPAIR CONTRIBUTOR
  • 31,937 POSTS
The code is for a cylinder one misfire, so we know whee to start looking, first thing to do is check for a vacuum leak around that cylinder and do a compression test as well. If you spray a little brake clean around the inlet gasket while running if there is a leak the revs will alter, or you can listen for a whistle with a length of small hose. both methods work well, re-post for further assistance if required.
Oct 10, 2017 at 3:07 PM
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RENEE L
  • CAR REPAIR CONTRIBUTOR
  • 1,260 POSTS
Hi LYNNIEBROWN,

If you decide to conduct the compression test yourself here is a link to an article from our site with written step by step instructions, with pictures and video to guide you:

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

If you have any questions or need further advice please reply to your post and one of experts will be happy to help you.

Thank you for visting 2CarPros and have great rest of your day!

Renee
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Oct 11, 2017 at 12:06 PM