Whistle Noise

[jdereu]

I am getting a weird hissing sound like as my turbo is spooling or right before it does. Its worse when the truck is cold or its cold outside. I have a DIY Intake, 4" MBRP, and a ts 6 position.. Any ideas why I am getting this hiss? I dont have my gauges in yet to see what my boost read out is so but they are on order

[jermcd]

your truck will idle high on its own if its cold. increase in rpm will increase the noise your hearing...

[jdereu]

I am awaare of that it doesnt happen when its warming up in the driveway.. It only does it under a load of some sort (hill, etc). This just started recently happening and i know its not what it sounded like before. Like i said it only happens when the turbo is starting to spool

[7.3HeavyHauler]

check your shaft play you may be close to a rebuild

[jdereu]

how do i check that and i was thinking a wicked wheel might help.. there is only 135000 miles on the truck

[7.3HeavyHauler]

take your intake off, grab the turbo shaft, move it up/down and in/out.....if it moves say 1/4" then you have turbo issues, if not then you have eliminated the turbo.

[jdereu]

The turbo shaft doesnt move at all.. I did clean out my EBPV tube today and tighten the intercooler boots but i havent drove it yet so ill see what happens when i drive it

[clintondh]

I have been having the same issue with my truck this year since it has been getting cold. It only does it after the enging is warm and under a load. Sometimes only after I've been on the road for a long while.

[Whistle_N_Smoke]

Same problem here, have a 2001 with 110K miles on it. and yes it is the EBPV that is shutting at part throttle first thing in the morning when its cold, then if you get enough exhaust back pressure it will open, ie 3/4 to wide open throttle but when you back out of it it shuts again. It takes about 7 miles to get it to stay open. I cleaned the ebpv tube and sensor and no luck. After hours of research on the damn computer looks like the engine oil temp sensor controls shutting that valve at certain temps and 32 degrees is when mine starts messing up, so i just replaced mine tonight and will let you know if it fixs the problem.

[jdereu]

Ya I have read its the ebpv sensor so let me know what you find out. Its been in the teens here all day and that noise is driving me up a wall