07-23-2012, 08:33 PM
Join Date: Feb 2011
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Crazy hissing noise under boost!
I just got back from my mechanic who did an oil change and changed out the fan clutch on my 2008 F450.
The truck as an S&B intake, H&S mini maxx, 5" turbo back exhaust and an EGR delete. Its had these mods for 20k miles with no issues.
About 70miles into my way home I heard a really loud hissing noise from what first sounded like it came from under the drivers side of the dash. I pulled over and noticed that my check engine light had come on.
The truck had thrown a "turbo/supercharger performance" code. I can't remver the actual number.
I cleared the code and drove the truck home slowly.. still making a crazy hissing noise but not throwing the engine light back on.
I checked the turbo hoses and it didn't really seem like they were ripped, plus they are on the passenger side so it wouldn't seem like that would be the culprit. the truck would still put out a healthy amount of boost and I didn't really notice a loss in power. I wasn't pushing it hard after this happend so I can't really be sure about the power loss but it wasn't noticeable at normal highway speeds.
The truck is going into a local diesel shop in the AM (they are Duramax specialist so i'm a bit hesitant trusting them with my truck).
My mechanic is about 100 miles away and I have to leave for a race weekend day after tommorow so I don't have time to go back to him.
Any idea on what this could be so I can maybe steer the local shop in the right direction?
Thanks in advance!
Last edited by canada6.0; 07-23-2012 at 08:45 PM.