5.0stx

Hello everyone . I purchased a used 2012 f150 stx super cab with the 5.0 liter in it earlier this week . Yesterday afternoon on my way to work i noticed a high pitched whistle under the hood while under mild acceleration . The whistle does not happen all the time and it seems to quiet down during shifts . And it does not change with engine rpm . The truck only has 25,000 miles. Anyone else having this issue? Any suggestions on what could possibly cause this noise would be greatly appreciated

jeffinthebag

It could be the whistle from the antenna. Under certain situations I have heard mine make a noise from the wind.

Hank JR Vanderscheer

Could also be throttle body spacer that the guy put in ... you did say you got it used

Ole' Blue 2014

I've heard this recently also. It's weird. It'll taper off just before the tranny shifts, then start again.

5.0stx

Yes, That is exactly what it does . And the truck is bone stock at the moment . It's going into the dealer Thursday for this issue so I will keep you guys updated

Ole' Blue 2014

Ok. Let us know what you find out.

5.0stx

Ok guys I took my truck to Westherr ford Thursday and they ended up replacing the pcv valve on the passenger side valve cover due to the base of it being cracked . My whistling noise is definitely quieter but it seems like a have a slight whistle coming from my left front wheel. Is it possible that I have a bad 4wd actuator or a vacuum leak at the hub?

gfc314

Well I think your problem is you took it to westherr...

TOWGUNNER

any chance that there is a k&n air filter installed in there just the drop in filter not the CAI. I have just the filter and it whistles on acceleration and coasting as well.

5.0stx

Nope I just checked everything and it is 100 percent stock , I did happen to find a couple aluminum shavings in my coolant which leads me to believe the water pump is going . I have heard that this is a common problem too . Especially on the mustangs . Maybe this is where the noise is coming from .