weird noise - Diesel Truck Forum -
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post #1 of 3 (permalink) Old 06-25-2009, 04:15 AM Thread Starter
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weird noise

Have had the tunes for about a month now. Noticed recently that there is a hissing sound like an air line leaking coming from somewhere on the vehicle. Thought maybe the pipe had come loose at the exhaust but can't seem to pinpoint it there. While at idle it is usually hissing and then can stop for a good few seconds before immediatley returning. It is always present when in motion. Any ideas? Also, a whining sound can occur during spool up, and is more evident with the 75 vs. the race tunes. These are more sporadic and seem to be during acceleration and are more noticeable during humid weather.

08 CC SB Lariat
S&B Spartan 275
13.4 @ 99.99 Capital Raceway Crofton MD
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post #2 of 3 (permalink) Old 06-25-2009, 05:13 AM
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I would check you intercooler boots... it somewhat common when you are tuned

2008 F-350 Lariat
6" Lift Riding on 37x13.5 Toyos

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post #3 of 3 (permalink) Old 06-25-2009, 07:39 AM
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I hear this hissing sound you are talking about when i turn off the truck. Sounds almost like a tire with a nail in it? I think that normal.


2008 F-250 PSD 4X4 XLT

542hp 1060trq 9/18/10
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