Loud hissing noise

[tony97gt]

So I got my truck back from the dealer two days ago, it went in for an oil leak. They replaced the oil pump gasket and front cover gasket. Now when I' driving down the road and I have about 20lbs of boost going during acceleration, I can hear the turbo since I have the CAI with no plastic covers on it. Once the TC locks up, the light hissing noise I hear gets REALLY loud. Nothing else happens with the truck (rpm stays the same, boost stays the same). Could I have a turbo leak or something wrong with my TC?

[04hdfatboy]

It sound like a boost leak. Check all the intercooler boots to start. See if you see soot anywhere that might indicate a leak (up pipes)

[Eric@PTP]

More than likely either a boost or exhaust leak but I's lean more boost.

[tony97gt]

Ok I'm going out there now to put the delete pipe back on I'll take a look. Where is the inter cooler? Sorry I'm new to diesel.

[Eric@PTP]

Its the very first cooler as soon as you open the hood.

[04hdfatboy]

Originally Posted by tony97gt

Ok I'm going out there now to put the delete pipe back on I'll take a look. Where is the inter cooler? Sorry I'm new to diesel.

Its at the very front of the truck. THe turbos run to the intercooler and then to the intake elbow.

[tony97gt]

Awesome thanks!

[tony97gt]

Went out and removed the DPF again and reinstalled my delete pipe and HD00 tune. I still hear the hissing but it's not as loud (or just that my exhaust and turbos are louder now). I checked the intercooler connections and some connections around the turbo, couldn't find any leaks. Checked from the downpipe back along the exhuast connections right after I fired up the truck cold and didn't feel any hot air coming out.

[04hdfatboy]

also look around the exhaust manifolds and up pipes.

[Eric@PTP]

Originally Posted by 04hdfatboy

also look around the exhaust manifolds and up pipes.

This is true, I have seen a few trucks come in with missing or broken off exhaust manifold bolts.