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Old 07-27-2015, 06:00 AM   #1
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Default 03 1500hd hiss noise

For as long as I can remember my truck has been making this hissing noise in the exhaust while accelerating. I never thought much of it until my buddy said it sounds like I have an exhaust leak. So I took it to a few shops and they all said there isn't a leak. The cats are fine, the manifold gaskets have been checked and are ok, and everything else seems to be good. I also can't find anyone on any forum with the same problem. Any suggestions?
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Old 07-27-2015, 09:48 PM   #2
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You could suck some Seafoam into the intake manifold and do your own smoke test.
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