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Old 12-07-2008, 02:32 PM
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tailpipe hiss

when i first start my 06 6.0 its sounds mean as hell for about 5-6 seconds then it sounds like it is hissing. I read some where in the owners manual that there is a noise reduction built in for the exhaust. How can i get rid of it?
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Old 12-07-2008, 02:35 PM
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Is it cold where you are? Its possibly the exhaust back pressure valve which closes partly to restrict your exhaust in order to warm the truck up quicker. This however should not be taking place after the truck warms up a bit. Does it take place all the time? Or just on initial startup?
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Old 12-07-2008, 02:36 PM
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i take it is a stock exhaust right? the hissing sound is just the way the 6.0 sounds. i cant remember how my stock exhaust sounded. but with my aftermarket exhaust once you start it up a few seconds later it starts that hissing like sound
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Old 12-07-2008, 03:03 PM
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normal. No spark plugs. Diesels should have a sentence by the ignition like there are by the gas door saying "cranky when cold".
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Old 12-07-2008, 03:06 PM
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Quote:
Originally Posted by darsey715 View Post
normal. No spark plugs. Diesels should have a sentence by the ignition like there are by the gas door saying "cranky when cold".
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Old 12-07-2008, 03:14 PM
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Quote:
Originally Posted by tom robison View Post
when i first start my 06 6.0 its sounds mean as hell for about 5-6 seconds then it sounds like it is hissing. I read some where in the owners manual that there is a noise reduction built in for the exhaust. How can i get rid of it?
Perfectly Normal this sound is your turbo. I am assuming you have the stock exhaust.

Quote:
Originally Posted by NotStock View Post
Is it cold where you are? Its possibly the exhaust back pressure valve which closes partly to restrict your exhaust in order to warm the truck up quicker. This however should not be taking place after the truck warms up a bit. Does it take place all the time? Or just on initial startup?
The truck in question is a 6.0. They do not have Exhaust backpressure valves
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Old 12-07-2008, 03:50 PM
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I have a 4" banks kit on the truck, no cat and it does it all the time, hot or cold, does not matter. it also did it when it had stock exhaust. It sounds like air is being injected right before the tailpipe, not turbo whine.
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Old 12-07-2008, 04:05 PM
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You got a muffler? Mine does it too and I think it is the Muffler. All it is is the sound of rushing air, and I think it is the muffler quieting it down....

I got a MBRP 4" turbo back, no cat with a muffler....I was worried it would be too loud in the campground, but now wishing I had ditched the muffler.
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Old 12-07-2008, 04:06 PM
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Does it sound like this? YouTube - FORD 6.0 EXHAUST
If so its normal
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Old 12-07-2008, 04:09 PM
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Originally Posted by Dave View Post
Does it sound like this? YouTube - FORD 6.0 EXHAUST
If so its normal
thats it , how do ya make it go away?
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