1998 F150 4.2, V6 engine. 100k+ miles; Unable to start--after tuneup, oilchange, fuel filter and PCV valve change and replaced battery. It sounds like it wants to turnover but doesn't. No visible leaks in fuel lines.
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There are a multitude of things that could result in a PO171 trouble code. It might be the infamous PCV elbow problem.. Around 100K miles 5.4's are bad to rot out the PCV elbow on the back of the throttle body, this will cause bad idling problems and will throw lean codes when it gets really bad. Find the PCV valve in the passengers side valve cover and trace the tube around to the back of the throttle body. With the engine running feel around the rubber elbow and see if you have a vacuum leak.
Here are some other things to try: 1. call your local dealer and ask them what it could be 2. Replace the front two Oxygen sensors. 3. Clean MAF sensor (especially if you've installed a K/N filter - could coat the wires with oil that collects dust). 4. Check/change air filter 5. Change the fuel filter (under drivers side frame) 6. Check fuel pressure
Unless you know you have a 100,000 mile motor specifically I always recommend full tune ups at 50,000. that being a tune up includes plugs, wires, pcv valve, inspection of all brake pads and shoes and a full lubrication. Oil and Filter changes at 3000 mile intervals even with synthetic oils.
New spark plugs, oil and oil filter, transmission flush and fill, fuel filter, air filter, coolant flush and fill, clean throttle body plate and bore, clean the MAF sensor, replace any loose or cracked vacuum lines, PCV valve, new air filter, new battery.
99% of the time all you should ever need for a tune up is new spark plugs, and a clean air filter and throttle body. But since your inquiry indicated "major" I gave it more critical thought.
With the advent of platinum tipped spark plugs and distributorless ignition a tune-up doesn't consist of much. Air filters (engine and cabin if equipped) should be replaced at 30k mile intervals (more frequent if in dusty climates). Spark plugs and PCV valve should be replaced at 100k mile intervals. The fuel filter is built inside the tank and is designed to last the life of the vehicle.
So basically if your at 100k miles you should replace the air filters, pcv valve, spark plugs and wires(if equipped). That is the extent of a "tune-up" now a days.
All engines need periodic tuneup. At the least is spark plugs, fuel and air filters, and O2 sensor(s). Any timing belt driven overhead cam engine should have the timing belt replaced every 50 to 60K miles. If it fails while running, nasty things happen to valves and pistons--this problem varies by manufacturer and engine design. You should change the oil filter along with every oil change.
Autozone auto parts will scan your computer for free...start there...then do a major tuneup...plugs, dist cap and rotor, wires, pcv valve, Ox [O2] sensor in exhaust every 60,000 miles...GAS FILTER!!! soooo important with fuel injected autos...every 12,000 or 15,000 miles. If gas filter is not changed the fuel pump has to work sooo much harder!!! Then it dies...
start me up!!!