Misfire

Tiny
LORENZOMCG 57
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 4.3L
  • 6 CYL
  • 250,000 MILES
Bad misfire and check engine light will flash when the speed is above 50 MPH.
Thursday, January 28th, 2021 AT 12:40 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

How old are the ignition parts such as plugs, wires, cap, and rotor? That would be a good place to start.

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

I would check the compression to be sure there is no internal engine damage.

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

I would also check the fuel pressure to be sure there is sufficient fuel being delivered to the rail.

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

Roy
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Wednesday, May 5th, 2021 AT 1:43 PM

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