Engine misfire how can I fix it?

WHITETAILFREAK · 2009-10-27T10:06:19+00:00

When traveling at hwy speeds and gently pushing further on the accelerator, the vehicle feels like there is a sputter or the trani is engaging and disengaging rapidly. Although, watching the Tach, it doesn't appear the engine is increasing separate of the trani. When pressing faster and further on the accelerator, the problem does not show up. Tried turning off the Overdrive and the problem still occurred. Cannot tell if it is an engine or trani problem. No "check engine" light set.

2004 FORD EXPEDITION

139,600 MILES • V8 • 4WD • AUTOMATIC

SMITTY0338

MEMBER
3 POSTS

Could a dirty throttle body course a miss at low idle

Nov 12, 2020 at 8:32 AM (Merged)

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

not really. i would start with basics and get the compression checked on all cylinders.

Roy

Nov 12, 2020 at 8:32 AM (Merged)

BIEL777

MEMBER
1 POST

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.

Nov 12, 2020 at 8:45 AM (Merged)

BMRFIXIT

✓ASE Certified Mechanic
19,053 POSTS

Next step is to do a compression test and check the injector

Nov 12, 2020 at 8:45 AM (Merged)

RASMATAZ

✓ASE Certified Mechanic
75,992 POSTS

P0307 Check the no.7 compression and injector

Nov 12, 2020 at 8:45 AM (Merged)

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