I have an 97 ford expedition. i have it for 6 years now and it runs great. but the other day i was driving i heard this pop sounf as if something blew off from being underpressure. i didnt see no visable signs of damage and the truck run normal as usual up until a drive and a hour later. i started hearing this flaping sound like the tuck was rolling on a flat tire or a flag whipping in the wind. once again i pulled over and checked every where trying to see whats wrong. it only made that sound when i was driving which made me believe it was something with the tires didnt see a thing. the truck still ran fine and that sound went away shortly. now this pop and flap sound happened once before about a year after i bought it, only that time it pop and flap flap all at once. so obviously what ever it is cant be critical cause 5 years later it still running strong. i just wonder what is that
I had the same sound that you mentioned. I found it to be the roof rack sliding backwards. Tightened it and the noise went away. Occasionally, it will make the same noise, depending on the wind, but I have always found it to be stopped by tightening the roof rack. Hope this helps.
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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.
never heard of a 4.7 are sure its not a 4.6 anyway if check engine light is on it knows what your problem is just drive it over to a auto zone or advance auto parts and they will pull the codes for you for free. that is the best place to start chances are one or more of your plugs or coils are acting up.
Possible solution..Expedition uses a vacuum solenoid on the firewall that controls vacuum to the 4-wheel drive actuator. Vacuum "unlocks" the 4-wheel drive, so you may have a leak in the line to the actuator so the 4-wheel drive is always on. Seems backwards, I know.
We have been experiencing same faults on a 2005 Expedition,with engine stopping and the message "Check electronic throttle". Ifirst went to AutoZone and they read the codes. They suggested replacing thethrottle sensor, which we did, but car stopped again. We had to replace thebattery in a month and this is the fix. The battery was almost 6 years old andwhen you first start your engine, it sucks too much load and gives these faultsto the computer. It never stopped since then (3 mo already). Sometimes we useto get the message 3 times a day.
If it was your cranshaft making that kind of noise.your motor would have frozen up already.it seems more like a tranny problem than an engine problem. Take it to a good mechanic. It sounds like your tranny is about to go.