Ignore the previous answer. Whoever posted that is WRONG.
The 5.4 (As you obviously know) , is a GAS engine.
A ticking noise in a 5.4 could be a number of things. Cracked exhaust manifold, Bad EGR Valve, a bad lash adjuster, or it's getting ready to blow a spark plug.
I had a similar problem in a taurus. I had to replace the alternator.
battery is dead
The check engine light is not related to the oil or the transmission fluid systems. It is related to fuel control, computer, emmissions control systems. The faint ticking you hear may just be the normal noise coming from the fuel injectors. All fuel injectors make some kind of ticking noise while they operate. I would say, if the check engine light has anything to do with the services performed, it would almost have to be a simple connector that may have been unplugged to move a wire out of the way, and then forgotten. Otherwise, I believe it would have to be a coincidence. Even if the ticking noise is a lifter in te engine, that still would not cause a check engine, and would not be the fault of someone changing the oil, as long as the oil is full.
Oil slow getting to the head
ticking noise when the gas pedal is pressed in a 2005 ford ranger
The most common problem would be a valve lifter not pumping up. Of more concern would be the valve seat in the #4 cylinder going bad. Escorts have had this very common problem for years.
The ticking noises is the lifters slamming into the valves. They are not receiving the amount of oil they require to lubricate properly. Either the oil level is very low or something else is seriously wrong. Continuing to run the engine like this will lead to very early engine failure.
the 4.0 in my rangers ticking loud worse on the drivers side has 150,000 on it
more than likely the tensioner
You should have an auto mechanic check the car or take to the Ford dealership.
have found that a ticking noise on the passenger side (under the dash) in the heater b5pdox (you can feel the vibration) on a 1997 town car is probably a vaccumn control switch.
Inferior fuel or too low of an octane rating.