Ford F150 Forumz banner
1 - 3 of 3 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
Hi all - I have a 2005 F150 2wd, 4.6 with Automatic. Ever since the temps dropped, I have a really high pitched whine/whistle coming from the engine compartment, but only at very specific RPM. First spot is around 1700, then again around 2000 to 2100 rpm. Trouble is, thats right where you typically drive.

I have done some searching, and every where I look it seems to say that its the idler pulleys or tensioner for the serpentine belt. Replaced all the idler wheels, the tensioner, and the belt itself, and it still does it. I also checked for vacuum leaks, and cleaned out the throttle body.

I've ruled out the transmission, because it does it parked in the driveway as well as on the road. No leaks, everything is full of fluid, and it makes no difference if the defroster is on or off. Its very RPM dependent, but only under 35 degrees.

Any ideas? This has been driving me nuts, and its to the point where I'm ready to get rid of the truck because of it. Thanks for any help you have!
 

·
Registered
2013 F-150 XLT 4WD with 5L
Joined
·
1,778 Posts
Have you tried to listen (using a stethoscope) to the individual accessories (i.e. PS pump, alternator, etc.) to see if it's a bearing issue?
 

·
Registered
Joined
·
7 Posts
Just dealt with a similar issue. Mine made the whining noise between 55 and 65 mph though.

First thing I did was replace the idler pulley, which did need to be replaced, but still heard the noise...

Just ended up being a loose cable that was rubbing when at those speeds... Weird I know, but just securing the cable fixed the issue.


Really cheap fix!
 
1 - 3 of 3 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top