Random misfire

2005 FORD F-350
160,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC
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POCOLACHRISTIAN
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  • 62 POSTS
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?
Apr 2, 2019 at 6:58 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
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
Apr 2, 2019 at 7:24 AM
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