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Engine misfire

Tiny
NORRDOGG
  • MEMBER
  • 2000 FORD F-250
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 164,000 MILES
Developed a severe misfire while on a trip. Checked COP and injectors with multi-meter. All within spec. Found bad front coolant crossover and replaced intake manifold and thermostat. All spark plug bores in head are clean. Still have misfire. Compression test shows 150 - 160 psi. OBD11 scanner shows P0308 cylinder eight misfire. Can find nothing in particular wrong with cylinder eight.
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Thursday, December 27th, 2018 AT 7:38 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi and thanks for using 2CarPros.

Try this. Switch the coil from cylinder eight with one from a different cylinder and see if the misfire changes cylinders.

Let me know what you find.

Joe
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Thursday, December 27th, 2018 AT 9:30 PM

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