Still sounds like it has a fouled plug?

Tiny
MIKEDELORENZO83
  • MEMBER
  • 2003 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 129,231 MILES
Had a fouled plug or two on my blazer. 4.3 liter. Changed them. Runs a little better but still sounds like it has a fouled plug. Better then it was but still sounds crappy. What can it be? Injector? I also started running premium gas in it. Can that have anything to do with fouling plugs?
Tuesday, December 28th, 2010 AT 7:44 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Typically when the engine misfires, it will produce fault code and the engine light will be illuminated.
Is the check engine light on?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Keep in mind that a spark plug can misfire due to a faulty coil pack. Sometimes when you have an issue with the coil pack it will produce random misfires.

Here is a helpful guide:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Also using premium gas will not trigger misfire.

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.
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Saturday, September 4th, 2021 AT 12:27 PM

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