Misfires

Tiny
DYLAN99
  • MEMBER
  • 1997 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 200 MILES
Engine come on then starts blinking engine runs rough like misfire. I replaced bot 02 senors plugs and wires plus rotor cap.
Monday, June 24th, 2019 AT 6:41 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
Welcome to 2CarPros.

If the light is flashing, I wouldn't recommend running it until we get it figured out. The flashing indicated a misfire is occurring which can cause raw fuel to make its way to the converter and damage it. Take a look through these links.

https://www.2carpros.com/articles/check-engine-light-top-ten-reasons

https://www.2carpros.com/articles/check-engine-light-is-it-safe-to-drive

Here is a link that helps identify and repair a misfire:

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

What I need you to do first is scan the computer for diagnostic trouble codes. This will point us to which cylinder has the misfire and then we can focus on it.

Here is a quick video showing how to use a scanner:

https://youtu.be/YV3TRZwer8k

I realize most people don't own a scanner, but most parts stores will do it for free or lend / rent a scanner to you. This needs done to identify where we need to focus. Otherwise, it becomes a guessing game. If you already did this, let me know what codes were found.

Do that and let me know the results.

Joe
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Monday, June 24th, 2019 AT 7:14 PM

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