P0300 trouble code

2002 BUICK LESABRE
200,000 MILES • 3.8L • 6 CYL • 2WD • AUTOMATIC
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FARMERJACK
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  • 1 POST
I have a p0300 trouble code with flashing check engine light and engine misfiring badly.
Oct 24, 2019 at 8:34 AM
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ASEMASTER6371
  • CAR REPAIR CONTRIBUTOR
  • 52,796 POSTS
Good morning,

I would start by performing a compression test to make sure there is no internal damage to the motor.

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

How old are the tune-up parts?

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

I would also check the fuel pressure as well to be sure the proper amount of fuel is being sent to the engine.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Oct 24, 2019 at 8:54 AM
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FARMERJACK
  • MEMBER
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I replaced the ignition control module and that fixed the P0300 trouble code and misfire. thank you.
Oct 28, 2019 at 12:11 PM
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STRAILER
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ASEMASTER6371 is one of our best! Use 2CarPros anytime, we are here to help. Please tell a friend.
Oct 28, 2019 at 12:11 PM
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