i have a 2000 ranger 4x4, when i start to drive around (10-30mph) a loud whistling noise comes from my engine, i thought it was the fan belt so i got a new one and the whistling didn't stop, does anyone know what is causing the noise??

 

Get cheap mechanic's stethoscope.
On the passenger side of the engine , just in front of the firewall , there is a camshaft syncronizer.
It looks like a shortened version of the old style distributors.
Place the probe against the shaft of it.
If you here any screeching noise , it needs to be replaced ASAP.
This unit drives the oil pump and is a known failure part.When it goes , so does your engine.

Note:
DO NOT purchase the cheaper DORMAN unit .
Buy an original FORD replacement.

 

how much do they cost ?

 

A whole lot less than a new/rebuilt engine. ~$100 or so.

 

ok, would i be able to get one from a ranger at junk yard ??

 

NO!!!!
Buy new.
Use the search button at the top of the pane for cam syncro
Take an hour or two to peruse the posts.

 

ok, thanks