When I accellerate, the engine hesitates, but idles fine.
replaced fuel filter, air filter,had injectors cleaned.
I attempted to replace spark plugs but had discovered FORD actually created a vehicle that is almost impossible to work on.
because of the air pollution,fuel rails and god knows what else is between me and the coil packs!
not to mention the fact the motor is neatly tucked so far inside the van , you cannot access any of the before mentiond parts without pulling the engine!
WAY TO GO FORD
shoulda bought a chevy!!!!!!!!!!!!!!
Re: 2002 E-250 5.4l hesitation during accelleration
Sounds like you could have a bad coil or boots. When I do tuneups on fords I always use motorcraft plugs, and replace the boots that hook to the coils, also buy some dielectric grease to put small dab inside the boot where it slides on the plug. You will probably also need 8mm socket, 7mm socket, and a wobble spark plug socket, or swivel to reach some of them. I usually try to blow air around the intake to clean any dirt off. Then I do 1 plug at a time, and while the plug is out i crank it over or start it a second to blow anymore debris out. Fords are bad about getting misfires on back cylinders. If you take it to a shop beware book time is about 3.5 hours. Could be worse I just got through last week tearing apart a 6.0 powerstroke in 2006 E350 (No access there)
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Possible there is tuning/timing issue on the engine and so it is best that you have the regular 15 point check up done on the engine so as to set the fuel and spark timing.
The fuel filter, the fuel pressure and the spark intensity at all RPM is to be checked and corrected.
Air and fuel mixture incorrect, restart the computer. Disconnect the negative or ground from the battery, turn the lights on to drain the computer faster, wait five minutes then reconnect. The computer is set to work with an old clogged filter, now you have more air coming in due to the K&N. The p0174 is the O2 sensor picking up on this, too much oxigen. Too much oxygen or not enough fuel. If restarting the computer does not work, replace the fuel filter and pressure regulator then restart the computer. You'll have to drive around for the computer to set, during this time do not mess with anything you'll throw off the computer. There should be some information in your vehicles manual about the relearn period. Before anything ceck for vacuum leaks, if there is air entering the engine after the MAF sensor the computer can not mesure it. Check for loose, disconnected or cracked vacuum hoses and replace if necessary. Start from there and let me know.