Misfire

250,000 MILES • 4.3L • 6 CYL
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LORENZOMCG 57
  • MEMBER
  • 1 POST
Bad misfire and check engine light will flash when the speed is above 50 MPH.
Jan 28, 2021 at 4:40 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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
May 5, 2021 at 6:43 AM
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