Question about 2004 Ford Expedition

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My '04 ford expedition has been starting rough. Someone suggested we turn the key a few times before starting it and that worked great. This weekend I filled the truck with gas. The next morning the check engine light was on and it started idling very rough, almost reving. I took it to AutoZone and the computer read O2 sensors. What could be the problem?

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  • 45 Answers

If its a lean code p0171 p0174 then i would suggest looking for a vacuum leak or the air filter housing and air inlewt for leaks.
is this a 2v or a 3v engiune?

Posted on Jun 02, 2010

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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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1 Answer

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thank you
good luck

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