Code PO300

Tiny
GLENN VAN SCYOC
  • MEMBER
  • 2003 GMC SIERRA
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 119,000 MILES
Misfire, check engine light.
Monday, March 25th, 2019 AT 1:19 PM

2 Replies

Tiny
SEVAG P
  • MECHANIC
  • 405 POSTS
Hello thanks for using 2CarPros.

For the fault code p0300 misfire run our guide.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Let us know what happens.
thank you.
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Monday, March 25th, 2019 AT 1:49 PM
Tiny
SEVAG P
  • MECHANIC
  • 405 POSTS
Misfire is a result of no proper combustion inside a cylinder that causes absence of spark, fuel or low engine compression.

Check for spark run our guide:
https://www.2carpros.com/articles/how-to-test-an-ignition-system

Check injector pulse run our guide:
https://www.2carpros.com/articles/how-to-test-a-fuel-injector

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

Feed back the result we are interested to know the problem.
Thank you

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Tuesday, March 26th, 2019 AT 1:31 PM

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