I wouldn't replace any of the spark plugs just the #6 coil, useless you have more than 100,000 miles. If you have to replace the spark plugs use BOSH double plautim or better. The cylinderplacing is ( as your are looking at the front of the truck) passenger side front to back 1-2-3-4 driving side front to back 5-6-7-8. To replace the #6 you are going to have to take the air intake system off. The coil will be located under the fuel rail (if you never seen a coil buy one so you know what you are looking for). The coil is held in by a 7mm bolt. Take the bolt out and replace the coil. Problem Solved. Estimated time 20 mins with 60 dollars.
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Have you changed your fuel filter? When is the last time you changed your sparkplugs? Have you had any codes on the computer? Heres what I would do. First change your sparkplugs. This is a 4-6 hour job. You have to unbolt the cop(coil on plug assembly). After you change the plugs your truck will run rough. Drive it around the block then back to your house. It will take 3-5 restarts before your truck quits running rough. Reason for this is because your computer is trying to "relearn" the firing order. I have done this several times so i know what i am talking about. You can even look it up. Your 2000 expedition is a dang good truck with a great engine. After your computer relearns the firing order then the rough idle will be gone. Then I would take it out on the freeway and run it hard for 5-10 miles. If you experience a miss or two then that means you need a new cop(s). Get a code reader and it will tell you which cop is bad. Cops are expensive. I bought 6 new ones on ebay for $40. If you buy from autozone or ford dealer then you are looking at about 80-100 bucks a piece. Tell me if this helps. Ford makes a good truck and the expedition is a great truck. Mine is a 2000 expedition also. I have 248,000 miles on it and running strong with no burning oil. Good luck.
romove poping plug start engine if thier is major air pressure coming outyou have ahole in your piston replace piston overhaule kitand new piston possible thred damage on head,replace cat,and get a dog:) good luck.
I'd check #1 spark plug.
Usually a misfire code "fix" is a spark plug, spark plug wire, or a coil pack / distributor.
Keeping it simple...I'd go with the spark plug first and then look at the condition of the wires.
why would someone even start with changing the coils...usually a misfire is due to bad spark plugs..replace spark plugs, then go from there...just for a personal reference, the next time you want to see if your coils are bad, simply change out your bad two coils with two coils on the other side of the engine that are good...if they misfire code changes, then you know its a coil...if not, plugs...
Go get the codes ran at auto zone or advance auto parts they will do it for free. If the codes come up as a cylinder miss-fire then it is most likely a coil (being a ford). Write down which cylinder it is. I wouldn't replace any of the spark plugs , useless you have more than 100,000 miles. If you have to replace the spark plugs use BOSH double plautim or better. The cylinderplacing is ( as your are looking at the front of the truck) passenger side front to back 1-2-3-4 driving side front to back 5-6-7-8. If you never seen a coil buy one so you know what you are looking for. The coil is held in by a 7mm bolt. Take the bolt out and replace the coil. Problem Solved. Estimated time 20 Mins with 60 dollars per coil.
I've got a 2002 Expedition that experienced the same kind of problem. Turned out that the individual load coils on the spark plugs tend to act up when they get wet (either from rain, or possibly from fluid puddling on top of the plugs). Anyways, the fix for me was to replace the load coil. The #4 and #7 plug coils seemed to cause me the most grief (seperately on two different occasions). The wierd thing is unless it gets real bad, no computer code is generated. I took it to the dealer, thinking they had some sure fire way to find the problem. After my third trip back, they were able to figure it out through elimination. The next time it happened, I just did it myself.