this just started yesterday. whenever i touch the gas pedal the truck makes a whistling/screeching type sound. it stops almost instantly after i let off the gas. one of my friends said he thought it sounded like a belt problem. any ideas?

 

If it does it in Park, find the source. Is it under the dash, or under the hood, or...?

 

i cant really tell for sure but it sounds like its coming from under the hood

 

do you have a cold air intake? how about a throttle body spacer?

 

nope and nope. all thats done is the exhaust

 

Will it make the sound in Park? If so, pop the hood & rev it manually at the throttle lever under the round black plastic cover on top of the engine.

 

It is probably a belt or pully if you think its a pully spray some WD40 on the bearing if it goes away for a minute its the pully. You can try some belt dressing spray but if not a pully and belt is in good shape it could be the belt tensioner. None of them are hard to replace with the right tools.

 

My fan clutch makes a whistling sound.