Engine misfire how can I fix it?

Tiny
WHITETAILFREAK
  • MEMBER
  • 2004 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 139,600 MILES
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.
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Tuesday, October 27th, 2009 AT 10:06 AM

45 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
It sounds like an engine miss. If you only allow it to happen for a short period of time, the computer will not set a code. It sounds like tis time for a tune up these guides can help us fix the problem

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

and

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

Please run down these guides and report back.
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Wednesday, October 28th, 2009 AT 11:29 AM
Tiny
WHITETAILFREAK
  • MEMBER
Complete tune up was done about a month ago and problem still is there and yes this is a 5.4 l with the high thread plugs.
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Friday, October 30th, 2009 AT 10:59 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If I had to guess, I would think you have a weak coil. The transmissions in these vehicles are great and have very little trouble.

That bad part here is the fact that the check engine light hasn't come on. The most common problem with the 5.4L is the coil. The fuel injectors, trans, engine. Are bullet proof. You would be surprised how many coils I've replaced. The only thing is, without a code, I have no way to be sure which one is the problem or if a coil is causing it. You may have to wait until it gets worse and sets the light.

Plus, the fact that it does it in both OD and with the OD off tells me it isn't the trans.

So, based on your user name, I take it you like to hunt. Have you gotten anything this archery season?

Joe
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Friday, October 30th, 2009 AT 11:09 AM
Tiny
NUCAMAN
  • MEMBER
I had to replace the #3 fuel injector fix it, I uses an OEM part fyi.
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Thursday, November 12th, 2020 AT 8:28 AM
Tiny
HUTCH3902
  • MEMBER
  • 2004 FORD EXPEDITION
  • 140,000 MILES
Engine light came on checked codes found cylinder 6 missfire changed coil and plug run great then light back on cylinder 2 missfire changed coil there still cylinder 2 miss either got a short or im on the wrong coil any help what is the firing order on 2004 ford expedition 5.4l v8 triton
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Thursday, November 12th, 2020 AT 8:29 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Change all plugs and the other coils. Look for coolant in the wells for the plugs, if there is, you will need to replace the intake

Roy
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Thursday, November 12th, 2020 AT 8:29 AM (Merged)
Tiny
HUTCH3902
  • MEMBER
Ok ill do that see what that does what is the firing order on this truck 2004 ford expedition 5.4L v8 triton driver side 1234 passenger 5678 or no
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Thursday, November 12th, 2020 AT 8:29 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Drivers side is 5 6 7 8 passenger side is 1 2 3 4

this is the cylinder location, the firing order is controlled by the pcm

Roy
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Thursday, November 12th, 2020 AT 8:29 AM (Merged)
Tiny
JMINIUTTI
  • MEMBER
  • 2003 FORD EXPEDITION
  • 93,000 MILES
My 2003 Ford Expedition is shaking and feels like the engine is skipping when I accelerate. When I stop there is a very strong sulfur smell.
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Thursday, November 12th, 2020 AT 8:29 AM (Merged)
Tiny
WRENCHTECH
  • EXPERT
I assume the check engine light must be on. Have the codes read and post them here. Be sure to post the engine size and mileage when you come back.
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Thursday, November 12th, 2020 AT 8:29 AM (Merged)
Tiny
FIXITMR
  • EXPERT
Catylitic converter is what smells!
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Thursday, November 12th, 2020 AT 8:29 AM (Merged)
Tiny
WES032
  • MEMBER
  • 2003 FORD EXPEDITION
  • V8
  • 2WD
  • AUTOMATIC
  • 153,000 MILES
When it rains, or I wash off the engine the truck runs ROUGH! Last time it did this I had washed off the engline and it ran rougher than ever. It would actually die for a split second and then restart, the lights would dim coming up to a idle, the security light on the dash would keep coming on even with engine running, check engine light was on. I brought it to Auto Zone hoping I could get a clue as to whats shorting out, but when they connected the scanner, the port was dead.
After a night of sitting it started driving right again.
Well now, the weather has been dry, I have not washed the engine off since, but its all of a sudden running rough, missing like crazy during any acceleration. I thought maybe it was bad gas. I put some octane boost, and fuel system cleaner, but to no avail. I bought a fuel filter, but cannot find where it goes. I checked along the whole under side along the frame, see nothing. I JUST replace plugs and boots about 18,000 miles ago. Was running GREAT after that. Dont know if these two issues are the same, or if I have two different issues causing the missing.
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Thursday, November 12th, 2020 AT 8:30 AM (Merged)
Tiny
RASMATAZ
  • EXPERT
Clean the idle air control valve and also the MAF sensor with an electronic cleaner CRC and see what happens-18K's mile on them plugs, I suggest you check it and also check the EGR valve
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Thursday, November 12th, 2020 AT 8:30 AM (Merged)
Tiny
KYLE MARCINKIEWICZ
  • MEMBER
  • 2003 FORD EXPEDITION
Shakes or Wobbles problem
2003 Ford Expedition V8 Automatic 110100 miles

Whenever I hit the gas I feel a slip or skip. I first thought I was the tranny but then I realized it could be the rear diff. Any ideas on what to do
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Thursday, November 12th, 2020 AT 8:30 AM (Merged)
Tiny
WRENCHTECH
  • EXPERT
It's far more likely to be an engine misfire although I am not there to hear and feel it. These engines have a lot of problems with the coils causing misfires but it usually sets a code to identify the cylinder.
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Thursday, November 12th, 2020 AT 8:30 AM (Merged)
Tiny
HECTORAPARICIO
  • MEMBER
  • 2003 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 103,000 MILES
My expedition is misfireing but I cant figure out why. I tried changing spark plugs, fuel filter, air filter, what else could I try?
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Thursday, November 12th, 2020 AT 8:30 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
If you replaced the plugs and it still does it, chances are you have a bad coil pack. Also, the check engine light should be on if there is a misfire. Have the computer scanned to determine which cylender is missing. Then I would check that coil pack.

Let me know what you find.
Joe
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-1
Thursday, November 12th, 2020 AT 8:30 AM (Merged)
Tiny
SEVENSTARS
  • MEMBER
  • 2001 FORD EXPEDITION
  • 0.5L
  • 4WD
  • AUTOMATIC
One sign of trouble ahead was it would have a bad cold start missing and puttin, then once it warmed up it was fine. Now it has a good cold start and when it warms up it starts missing, like that of a vehicle running out of gas. So far two mechanics have not figured out what is wrong with my ford expedition. Had a new manifold put in, because of losing antifreeze and yes it got in the oil, new brain and it still misses while driving. Also had spark plugs replaced and gas filter changed. Both mechanics were highly recommended, so this is going to be a challenge, its been in the second mechanics garage now for going on four months.
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Thursday, November 12th, 2020 AT 8:31 AM (Merged)
Tiny
HMAC300
  • EXPERT
What manifold was replaced? If intake were new isolator bolts replaced? They should have been that may be the cause. What is vacuum reading at idle? Wha tis fuel pressure should be 30-45 psi.
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Thursday, November 12th, 2020 AT 8:31 AM (Merged)
Tiny
LITTLE TIME
  • MEMBER
  • 2001 FORD EXPEDITION
  • 145,000 MILES
Cyl 1 misfire, random misfire, left bank lean. Runs rough through out a trip anywhere. I have changed all the plugs with motorcraft plugs fighting problem for 2 month since plugs were changed
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Thursday, November 12th, 2020 AT 8:31 AM (Merged)

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