High pitched whistle?

[cameronmcclure]

So when my truck runs at 2000-2500 rpm it whistles like something awful. It's really high pitched. I have an AFE stage 2 intake on it and at first I thought it was just the filter was really dirty. But, I cleaned it and it still whistles. At first it only did it when the truck was cold but not it seems to do it all the time regardless of how long the truck has been running. I just wanted to know if this was normal with the afe kit or if anybody had any idea what might be causing it. Thanks.

[fordpwrstroke7]

Cracked exhaust manifold? Maybe cracked up pipe on back of motor?

[GlamisPSD]

Is it a whistle or a howl? Is it consistent with throttle pressure? Meaning if you are in the go pedal it does it, the minute u let off it gors away?

Mine has this weird howl and it progresses from low pitch to high. It is not consistent with throttle pressure and I notice it when I am pulling heavy loads up hill where my foot is int it. When I let off it's still persists.

[1tonpower]

Someone else with the same Prolem..my truck sounds like a tea pot under light load with boost in the range of 15-20lbs. If I mash the peddle it will stop. Mind you this is with my superchip cortex on performance. The truck runs and sounds normal on the tow and stock files loaded. I am baffeled

[cameronmcclure]

Originally Posted by 1tonpower

Someone else with the same Prolem..my truck sounds like a tea pot under light load with boost in the range of 15-20lbs. If I mash the peddle it will stop. Mind you this is with my superchip cortex on performance. The truck runs and sounds normal on the tow and stock files loaded. I am baffeled

mine doesnt have a tuner (yet) but yes it sounds like a tea pot. it goes to the shop on the 21st to have it looked at so if they get it fixed i'll let you know what it was.

[Shadrack]

I have this EXACT problem, and my truck is BONE STOCK. It's not either idler pulley or belt (dealer changed them Friday), I am starting to think it's an alternator bearing doing down. Read my thread below and see if it's not the exact same thing.

What is this noise!? Video Included

[highdefdiesel]

I had the same problem bout 8 months ago ... very throttle responsive ... turned out the i had two broken head studs and the head gasket was blown out ... truck was all stock.... id take that problem anyday rather than what im going through now ... Two blown turbos ... grrrr

[dhanna6powerstroke]

One of the turbos is probably the problem. That is what shadrack's problem ended up being.

[powertower]

I had similar symptoms earlier this year is it leaking coolant at all on the main rad hose to the engine on the drivers side? Mine puked coolant all over the front axle then leaked slowly afterwards. They told me it was one of the seals on the main rad hose right where it was leaking and it was replaced and this went away but it didn't make the noise all the time. Hope this helps.

[cameronmcclure]

It ended up being a cracked right turbo inlet pipe. It's fixed and is howl free.