Engine misfire how can I fix it?

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.

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.

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

I had to replace the #3 fuel injector fix it, I uses an OEM part fyi.

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

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

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

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

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.

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.

catylitic converter is what smells!

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....

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

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

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.

My expedition is misfireing but i cant figure out why. i tried changing spark plugs, fuel filter, air filter, what else could i try?

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

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.

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.

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

I am giving you a walk through diagnostic regarding your situation. Just follow the link below;

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

Engine Mechanical problem
2001 Ford Expedition V8 Two Wheel Drive Automatic

I have a 2001 ford expedition eddie bauer and it has a really really bad miss when I give it gas it acts like it dont wanna go but if I push on the gas it will pick up and the check engine light is on can u help me plz

If it is a 5.4 L engine it may be a spark plug coil. Each spark plug has a coil to fire the plug. I have replaced two on my Expedition in the past three years

Engine Performance problem
2001 Ford Expedition V8 Four Wheel Drive Automatic

Code for # 3 cylinder miss fire installed new plugs and boot for # 3 coil , ohmed coil in a static state got .55 on primary and 5.4 k on secondary me next step is coil replacement if there is a dynamic issue , input please . jeff

Have you actually checked to see if there is spark to the plug? If there isn't or it is weak, I would replace the coil.

Let me know.

Engine Performance problem
2001 Ford Expedition V8 Four Wheel Drive Automatic

code PO354 replace coils and then get this PO354 original code was for coil

updated 8-3-09
Hi, have 5.4 2001 expedition got code to replace P303coil rplace coil and spark then get 304 replaced that coil and spark now runs just as bad got PO354 primary circut fault
and later 141 along with 354.?

Yes that has been replaced also, only one that has not been replaced is the very 1st one one the right.

That code identifies cylendr 4 missfire. If you are standing in front of the vehicle looking on the left side cyl #4 is the second one back. Is that the coil pack that you replaced? Also, did you replace the rubber boot that goes over the spark plug and the spark plug?

I don't have a problem with coils anymore ,the code I get is P0354 It mean primary circut failure! what is this!

This still deals with a coil pack. One could still be bad or the power to the coil could be too low. I believe you shoud have 10+ volts to the coil pack. Have you checked for that?

As far as a primary circuit, it is one of a collection of coupled coils or circuits that receives electric power from a source and transfers it to the secondary circuit by electromagnetic induction. That is why I am questioning the power to the coil packs.

yes I have and they 6.7 so what do I change to fix this. thanks

I am not sure what is causing it we know its not the motor mounts. It seems as though its a mis fire or bad cylinder but not sure. It was in the shop and had tps repair but no change. nothing registered on diagnostic that would pinpoint problem. please help

A dealership may be the only place that can perform the test I'll tell you about. The concern with your vehicle is most likely an ignition coil. Your vehicle has one coil for every cylinder. They mount on top of the spark plugs. They are notorious for going bad. The dealership has a computer that monitors individual cylinder contribution while the engine is running. They can identify the cylinder using this power balance test. After they identify the cylinder, they can do a stress test on the coil itself.

My 2000 Ford Expedition check engine light is on. I hooked up tp a diagnostic machine at Autozone with the codes telling me that that #2 cylindar wasn't firing and that both sides weren't getting enough fuel.

What is happening is when I go up hills I lose power. When I try to accelerate once I hit 3000 RPM's it drastically loses power while jumping to 400+ RPM's.

Am I looking at a tune up or am I also looking at transmission problems?

BTW, by the time I got home I couldn't get to 70mph when it would happen on flat ground.

do you have to pay to get an answer or is payment an appreciated donation?

The payment is not required, but a donation is appreciated since the answers mostly come from people who give up their time to do this. I am assuming that by mentioning that both sides weren't getting enough fuel, were there two other codes as well? Possibly P0171, P0174? Most of the time these codes appear it is due to an intake leak. The engine sucks in unmetered air and the ratio of air and fuel is compensated. The computer registers that there is not enough fuel being burned and dials up the fuel injector pulse. But if the intake leak is severe enough, the computer cannot safely compensate enough and kicks out those two codes. Since you have a misfire code as well it is possible that the intake leaks are gasket failures where the plastic intake meets the aluminum heads. It is not uncommon for these to go bad since the heat and expansion of the aluminum differs from the plastic. I would start looking for vaccum leaks first before anything else. If you have any questions you can PM me.

hi i have a 2000 e-350 5.4 with a miss on number 4 cylnder. i have changed the coil pack and plugs and ingectors still misses i have spark on the coil pack

could be a failed injector. could also be a comporession issue. you need to get it checked to confirm.

Roy

how do i fix a comporession issue

the cylinder head would have to be removed to determine the failure. it is a very big job that is best left to a shop.
before jumping to conclusions, get it verified first.

Roy