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Check engine light on

Tiny
JRPMX33333
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 3.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 214,500 MILES
While on my mail route I hit some little bumps on a dirt road. Going about twenty mph. Got past the bumps check engine came on and motor sounded rough and lost power (lost lots speed going up hills). Got checked at O'Reilly's three misfires in cylinder one, two o2 sensor codes. Got o2 sensor fixed and changed the plugs and wires still have the check engine light on (light flashes when driving), and still seems to be the same condition as before. I do not know what else to do.
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Sunday, September 24th, 2017 AT 2:58 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It sounds like you may have had a timing chain jump in the engine. We can confirm by doing a compression test on two cylinders.

Here is a guide to help you get the job done:

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

Please let us know what you find.

Cheers, Ken
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Tuesday, September 26th, 2017 AT 12:56 PM

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