Just curious.... - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 12-02-2009, 08:45 PM Thread Starter
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Just curious....

I know the loud hissing noise at first start idle is normal...but why does it go away if I tap the brake? I thought that loud hissing was the flap bypassing the turbo...? Does that sound come from a vacuum pump or something??
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post #2 of 4 Old 12-02-2009, 08:57 PM
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nope its a valve in the exhaust that aids in heating up the engine and the reason it goes off when u tap the brake is because it assumes your gonna drive and doing that with a valve closing up some of ur exhaust would make your truck less than pleasurable to drive ... said less than eloquently .. hope u get the point lol


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post #3 of 4 Old 12-02-2009, 09:00 PM Thread Starter
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Interesting. Thanks for the info!
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post #4 of 4 Old 12-02-2009, 09:02 PM
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yup. same thing here. sometimes it takes a minute to open like today i drove down the street a bit til it opened(sounds like a huge turbine or somethin lol) when you put it under load enough it opens.
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