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Random misfire

Tiny
POCOLACHRISTIAN
  • MEMBER
  • 2005 FORD F-350
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Had a misfire code on cylinder eight. Changed the coil pack. When I drove it again it didn’t have much power and another code for misfire on cylinders two and three. Should I just change all the coil packs or is there something bigger causing the loss of power issue?
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Tuesday, April 2nd, 2019 AT 6:58 AM

1 Reply

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

What about the plugs? They are just as important as the coils.

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

Did you do a compression test?

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

Random misfire is usually caused by low fuel pressure. Have you tested the fuel pressure?

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

Roy
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Tuesday, April 2nd, 2019 AT 7:24 AM

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