high pitched whissel sound at idle

[mxr713]

i have a very high pitched whissel sound at idle coming from under the hood, just started the other day but it is getting worse.it goes away as soon as i rev the engine up. its coming from underneath the hood i have tried to listen all over with a stethascope but just cant seem to pin point it. any help would be must appreciated, as it is driving me crazy haha. thx
ps the truck has 4" turbo back exhaust, a egr delete kit and studs.

[MWilbur516]

Pin hole starting in your up pipe bellows.

[jwr1527]

A buddy of mine has one that did this and we ended up finding that the small rubber hose (I think its about 3/8 in size) going into the intake on the passenger side had ripped and was causing the high pitched whistle. It's about midway back on the top of the intake. Not sure if its your problem but worth a look.

[MWilbur516]

Originally Posted by jwr1527

A buddy of mine has one that did this and we ended up finding that the small rubber hose (I think its about 3/8 in size) going into the intake on the passenger side had ripped and was causing the high pitched whistle. It's about midway back on the top of the intake. Not sure if its your problem but worth a look.

Sounds like you're talking about the MAP sensor line. Was your buddies truck running bad? Usually a broken MAP line causes all kinds of turbo issues. Could cause a wicked whistle though, 25psi shooting out that little boost line.

BTW, the work you've done on your rig looks great. You have definitely poured some cash in it!

[jwr1527]

Ya I'm pretty sure that was the line, I wish I had my old 6.0 here to go look at for better reference. But no the truck ran perfect other than the annoying whistle, as much as I can remember anyways, it was a couple years ago now. And thanks, ya I've put quite a bit into it in the last 2 months, now if I could just get my damn wheels to show up I can call it done for little while but I keep finding little things to spend money on to keep my mind off the little tires haha. Should finally after 2 1/2 months have them next week though.

[mxr713]

it only does it when its hot and it runs perfectly fine and has lots of power. is there a easy way to pin point where the pin hole is in up pipe belows?

[dannyboy950]

Originally Posted by mxr713

it only does it when its hot and it runs perfectly fine and has lots of power. is there a easy way to pin point where the pin hole is in up pipe belows?

Eventually you should see signs of soot on the firewall.

By the way that whistle doesn't sound like a teakettle does it. Maybe check your degas bottle cap.

[MWilbur516]

Originally Posted by dannyboy950

Eventually you should see signs of soot on the firewall.

By the way that whistle doesn't sound like a teakettle does it. Maybe check your degas bottle cap.

^^^This^^^