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    Merc 496, Where is the IAC muffler? having strange noise

    Last weekend my 496 Mag developed a strange intermitant hissing noise almost like a belt slipping sound or air intake leak. It happens every 3-5 seconds only at high speeds over 40mph. I think some of it may be due to my hatch is lifting (Ultra 21" Stealth) and the air at high speedos is hitting...
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    Strange alarm pattern on a 496. Always & only occurs on 1st run of the day

    I recently bought a 2005 21? Ultra w/ a 496 MAG, 100hrs. Before ever using it I took it to a great mechanic where I live in O C, Ca and had a full service which included a new raw water pump. No fault codes came up and the motor checked out. Things were great but on my 3rd trip at Lake Havasu I...
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