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post #1 of 19 Old 11-07-2012, 01:26 AM Thread Starter
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Loud hissing noise

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?

2008 F250 Harley Davidson 4x4, Upgraded LED lighting, JL Audio 13.5" Stealthbox, JL Audio C3 door speakers, JL Audio 500.1 for the stealthbox, JL Audio 400.4 for the doors, Viper 5704 alarm/SmartStart and GPS tracker, JimmiJammer door plates, JimmiJammer gateguard, Delete front lock/rear handle swap, DPF delete, MiniMaxx, 2.5" level, Sinister coolant filter, 55w 6000k HID's driving/fog lights, S+B CAI, MBRP 5" DP back exhaust, 35x12.5x20 TIS 20" rims, Nitto Trail Grapplers, adjustable track bar.
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post #2 of 19 Old 11-07-2012, 06:41 AM
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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)

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post #3 of 19 Old 11-07-2012, 06:52 AM
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post #4 of 19 Old 11-07-2012, 07:18 AM Thread Starter
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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.

2008 F250 Harley Davidson 4x4, Upgraded LED lighting, JL Audio 13.5" Stealthbox, JL Audio C3 door speakers, JL Audio 500.1 for the stealthbox, JL Audio 400.4 for the doors, Viper 5704 alarm/SmartStart and GPS tracker, JimmiJammer door plates, JimmiJammer gateguard, Delete front lock/rear handle swap, DPF delete, MiniMaxx, 2.5" level, Sinister coolant filter, 55w 6000k HID's driving/fog lights, S+B CAI, MBRP 5" DP back exhaust, 35x12.5x20 TIS 20" rims, Nitto Trail Grapplers, adjustable track bar.
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post #5 of 19 Old 11-07-2012, 07:19 AM
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post #6 of 19 Old 11-07-2012, 07:20 AM
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Quote:
Originally Posted by tony97gt View Post
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.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #7 of 19 Old 11-07-2012, 07:20 AM Thread Starter
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Awesome thanks!

2008 F250 Harley Davidson 4x4, Upgraded LED lighting, JL Audio 13.5" Stealthbox, JL Audio C3 door speakers, JL Audio 500.1 for the stealthbox, JL Audio 400.4 for the doors, Viper 5704 alarm/SmartStart and GPS tracker, JimmiJammer door plates, JimmiJammer gateguard, Delete front lock/rear handle swap, DPF delete, MiniMaxx, 2.5" level, Sinister coolant filter, 55w 6000k HID's driving/fog lights, S+B CAI, MBRP 5" DP back exhaust, 35x12.5x20 TIS 20" rims, Nitto Trail Grapplers, adjustable track bar.
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post #8 of 19 Old 11-07-2012, 10:20 AM Thread Starter
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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.

2008 F250 Harley Davidson 4x4, Upgraded LED lighting, JL Audio 13.5" Stealthbox, JL Audio C3 door speakers, JL Audio 500.1 for the stealthbox, JL Audio 400.4 for the doors, Viper 5704 alarm/SmartStart and GPS tracker, JimmiJammer door plates, JimmiJammer gateguard, Delete front lock/rear handle swap, DPF delete, MiniMaxx, 2.5" level, Sinister coolant filter, 55w 6000k HID's driving/fog lights, S+B CAI, MBRP 5" DP back exhaust, 35x12.5x20 TIS 20" rims, Nitto Trail Grapplers, adjustable track bar.
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post #9 of 19 Old 11-07-2012, 11:54 AM
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also look around the exhaust manifolds and up pipes.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #10 of 19 Old 11-07-2012, 12:28 PM
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Quote:
Originally Posted by 04hdfatboy View Post
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.
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