nofreetime

I plan to next week, I don't have a bunch of faith in ford dealerships to really trouble shoot problems. I was hoping that I could steer them in the right direction of what might be wrong.

Snowflake

You could always take it to an independent shop. Lots of the better shops have all the same tooling as Ford. We can all give you a suggestion on what it may be but without hearing or seeing your truck we are just guessing.

nofreetime

I might try that. My local dealership doesn't even make appointments anymore. First come first serve. I'm sure there are good ones out there, just our local ones have rubbed me the wrong way. I will keep you posted on what they say

Snowflake

You can check iatn shop finder for shops near you. Plenty of good shops on there.

liljbakes

Was there ever a solution to this problem. I just bought an 11 f150 5.0 with 60k miles and have noticed this whistle/squeal a few times. I was able to get the squeal to vary it's tone while feathering the throttle as it was swealing, leading me to believe it is within the throttle body.

Vinnyf150

I have not had a solution for my 2011 F150. Had it since new and it still makes the squeal and as you mentioned, you can control it via feathering the throttle as it is squealing.

Drew Wheatley

Anything new anyone? I had the thought to remove the TB and possibly "polish" the fins in the intake manifold. My thought is if there is a burr it could cause this whistle or squeeling sound. Mine is the same RPM range as others have mentioned. I also considered removing the belt and doing a quick drive to see if the noise was there just to eliminate pulley / belt noise from something in the intake.

onemoreday21

I realize this post is from 2012, but oddly enough, my 2011 5.0 started making this whistling noise right after my dealer replaced my water pump under warranty (while trying to fix the dreaded 5.0 knock, they wouldn't listen to me that the water pump wouldn't fix it).

It still seems to be an intake/vacuum leak issue to me, just because it is throttle position dependent, but I find it odd that two people's trucks started having this issue after having a water pump replaced.

Drew Wheatley

I wanted to provide an update on my truck.

After doing a LOT of research and taking into account bits and pieces of what others have recommended or had thoughts on… I’ve reduce the sound to almost being nonexistent and ever so faint in the most perfect scenario of throttle position. In other words, it’s pretty much resolved compared to what it sounded like originally.

1. I removed the throttle body and sanded the edges down on the throttle plate (did not remove from the body or arm), as the edges were very sharp. I used 100 grit sandpaper and simply knocked the edge down enough so that it smoothed out the edge. I didn’t remove a whole lot of material here and maybe spent 15 minutes on this step in total.

When I was done with both, I used throttle body cleaner on the body to remove any metal shavings, dirt, etc and let it dry. I then sprayed some in the intake and used paper towels and a shop rag to mop up any plastic shavings. I spent quite a bit of time ensuring no shavings were left in the intake and also that the throttle body had no metal shavings in the body itself.

The truck runs great, idles just as well as before, and most importantly – doesn’t whistle! Before my truck would do it from 1500-2100rpms with 1/3 throttle, and annoyed me to no end with the window down. Now, you have to have the pedal just right and around 1700 rpms just to barely hear it with the windows down. 95% improvement here, just sharing my experience, and I hope this helps someone. If you need more details, just let me know. Unfortunately I don’t have any photos.

BE25FX4

Hi guys!

Any updates from the "fix" above or anything else? I just had my water pump replaced and now I have the issue. I have a 2011 f150 5.0.