so my truck started making a weird noise a few days ago its kind of like a buzzing air sucking/hissing noise it only does it when i push the gas pedal down or i have been holding it steady on the highway...does anyone have a idea of what it might be or something to check or change any info would be great?? .. its driving me insane!!!

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Forgot to mention it stops when I get off the gas pedal

 

Does your truck seem to loose power when this happens? Do you have a boost guage?

 

sounds like a leak somewhere what rpm does it start doing it i think the turbo spools around 1200 rpm or so but it might be a turbo leak somewhere need a little more info

 

No doesn't loose power any.. i dnt have any gauges and it does it bout a 1000 maybe a little more. Thought it might be powersteering making noises

 

doesnt sound like its almost in the cab does it? my heater hisses and whines at me at high rpm sometimes. annoying as hell.

 

It does sound like it's in the cab. Drives me nuts if it ain't that noise then it's the fan bein loud as ever.

 

Bet you have a torn/slipped charge pipe connector

 

Did you ever find the problem? I have a 99 powerstroke that recently had the downpipe replaced. After getting it back i noticed some mornings it makes a strange hissing sound when i accelerate at all. It only seems to do it on cold mornings.

 

Brad- your's sounds like the EBPV is closing, I also have a 99, and have seen where ours are the worst for that problem. look in front of the turbo, and down low, there's a connector (2 wires I think) unplug it, and make sure the valve isn't stuck closed (the rod should be pushed into the turbo base) won't hurt anything, ford designed it to make them warm up quicker.

 

Thanks i will check that out.