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Engine misfire how can I fix it?

Tiny
SMITTY0338
  • MEMBER
  • 3 POSTS
Could a dirty throttle body course a miss at low idle
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Thursday, November 12th, 2020 AT 8:32 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Not really. I would start with basics and get the compression checked on all cylinders.

Roy
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Thursday, November 12th, 2020 AT 8:32 AM (Merged)
Tiny
BIEL777
  • MEMBER
  • 1 POST
  • 2002 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
I have a 2002 ford expedition 5.4L V8. It started to run really rough. Code reader said #7 cylinder misfire. I replaced all plugs and coil pack on #7 cylinder. It runs better but It still lags. Code still pops up as #7 cylinder misfire. Also, I have white smoke(which stinks) coming out occasionally. Any help would be appreciated. Thank you.
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Thursday, November 12th, 2020 AT 8:45 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Next step is to do a compression test and check the injector
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Thursday, November 12th, 2020 AT 8:45 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0307 Check the no.7 compression and injector
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Thursday, November 12th, 2020 AT 8:45 AM (Merged)

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