Question about 2003 Ford Expedition

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2003 Ford Expedition 5.4

The truck has 127,000 miles. I have gone through several instances of 'Check Engine Lights'. I have replaced two COPs (Coil on Plug) and all of the Boots between the COPs and plugs.
My current problem is a missing or stumbling in the engine. It happens from 1,500 - 2,000 RPM. It is very consistant and occurs every time it is driven. It has even quit on me twice but cranked right back up. When I floor it it runs fine. I have replaced the fuel filter. There are no codes on the computer.

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  • charlene146 May 20, 2009

    I have been having this same issue and had to replace 2 cadelidic converts costing well over $3,000 now 6 months later having the same issue and now it has died and over drive light is flashing. If any one know what to do please HELP!

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This sounds like a performance problem with components that are not bad, this truck needs to be hooked up to a Tech II machine, however due to the cost of this machine usually the dealer is the only guy in town with one, you may be running into a program problem, the only way to see that is with a Tech II tester, be sure to tell the shop everything you have done and make sure they understand your complaint before hooking up.

Posted on May 20, 2009

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2 Answers

2000 Expedition is idling badly and stalling.


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.

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I am repairing a blown head gasket on a 2003 Ford Taurus w/ a duratec V6 3.0L 24V engine w/ 127,000 miles. This involves removing (& I am replacing) the timing chains. Should I replace the oil pump?...


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1 Answer

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1 Answer

Fule pump and filter have been changed teres are good and spark plugs are good to why does it buck and sometimes shut off


I had the same issue on my 03 Expedition. Jerks randomly but gets worst and extreme misfires/stalls/shuts down. Then restart and its fine. These bucks more likely are random misfires (Chk engine light may/not come on) associated with the ignition coil/s failing. These coils have a average life expectancy of 79,000 miles or 5yrs. I replaced all 8 COPs (coil over plug) @ 48,000 miles just to be safe with new accel coils. The coil models for engines 4.6/5.4 V8s are DG508. Hopefully this helps!

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1 Answer

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5.4L or 4.6L engine?? Check your coils. Go to autozone or advance auto parts and have them scan the ECU for the check engine light!! Its recommended to replace all 8 COPs(ignition coil over plugs) upon replacing the sparkplugs. These typically go out, especially if the coil boots are cracked. Hopefully this helps

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