I can't remember off the top of my head. But if you look near your TPS (Throttle Positiong Sensor) there is another sensor on the side of the engine that is silver with a black cylindrical cap. It;s held on by 2 bolts and the footprint looks like a diamond. If you replace that part the humming will stop. It has to do with the sensor allowing too much or too little oxygen into the engine.
The humming probably sounds like it's coming out of your intake, but that sensore will fix it. If I recall what it's calls, I'll post up.
It;s the IAC (Idle Air Control)
I've posted a pic from my Photobucket account
http://s82.photobucket.com/albums/j252/Tonkatoy163/?action=view¤t=Ranger-IAC.gif
There could be a humming noise from the engine of a 2002 Toyota Corolla because of low oil or a fouled spark plug. It can also indicate a more serious problem.
There could be a few things that can cause this humming sound. It could be the wheel bearings rubbing, it could be the gears rubbing, it could even be coming from the engine pistons.?æ
There can be a slight humming noise while driving a neon. This sound could come purely from the engine to indicate that it is running.
The humming is a series of explosions in the engine happenning very quickly. Could also be an electric fuel pump if the vehicle is equipped with one.
The cause is most likely a worn out wheel bearing.
A clicking noise in the engine of a 91 Ranger could indicate a problem with the valves. A valve lifter in the engine may be worn or stuck.
Your engine might make a humming noise near the alternator after you shut it down because the fan is still running or because the fuel pump is shutting down. Another cause for the humming noise could be the AC motor turning off.
In a 2000 Ford Ranger : Yes , you could have either the 3.0 litre V6 engine or the 4.0 litre V6 engine
A 2001 Ford F-150 could have a V6 or V8 engine A 2001 Ford Ranger XLT could have a 4 cylinder or the 3.0 or 4.0 liter V6 engine
What kind of whining? Could be your serpentine, could be your steering pump.
The labor time for a 2000 Ford Ranger with a 4 cylinder engine is 10 hours, or roughly $900. It could be more depending on the year of your vehicle and for the 6 cylinder engine.
You could have a 2.3 liter - 4 cylinder engine , a 3.0 liter - V6 engine , or a 4.0 liter V6 engine