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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.
Fords are notorious for bad vacuum lines. Mostly the elbows that are preformed. These just don't stand up to oil or any chemical. These are located any place on the plenum. Some are on the bottom. Hard to get to, but not impossible. Usually the are the large ones that go bad first. Look for the vacuum line s and follow them back to the intake plenum. Sorry you had to replace the MAF...The O2 codes are from the ECM trying to compensate for the extra air coming in...
Check the oil pressure sensor, its located directly above the oil filter. The sensor usually has a bright green connector. Oil pressure sensor failure is pretty common with Chrysler products. Thay are very easy to change with a deep 27MM socket. Look to see if the sensor is leaking oil as this is usually a tell-tale sign that the sensor has failed
Right before the evaporator, but there are dangers involved with this repair, and LEGAL exposure..
This job requires special tools and special training. If you lack either, you risk SERIOUS personal injury. Injury comes VERY EASILY! You need to address oil levels, proper and legal refrigerant recovery, system evacuation, and recharge. You were planning to also replace the receiver/dryer, correct? It also needs the oil in it measured and incorporated into the amount of oil (in %) that would need to be added. FAILURE to address these and other issues will guarantee premature system failure and likely compressor damage. Take this job to a qualified shop.
Usually the oil sending sensor will go bad on this vehicle. I have changed mine , which jumped up and down but not all the time. It cost about $25 and 5-10 min of time. It's located right at the oil filter. Just be sure you don't have a major problem internal, but the expedition is known for the oil sensor to go out. The sensor usually is worst in the winter detecting the oil pressure.
Most likely it's the oil sending sensor, located beside the oil filter. You can change it, just be sure to have old newspaper or rags laying around the area where you will work, because a little oil will be lost. The part isn't expensive, for mine on a Ford Expedition was around $35 and took 5 minutes to change. Just un-plug the connector going to the sensor, and a larger wrench will be needed, large (7/8, 15/16) somewhere in that range of size.