Hissing sound on 2001 SRX

[Jimbo]

gentlemen, a friend of mine was riding with us Saturday, and when he cranked his SRX, it would make a hissing sound. I eliminated everything I knew, but could not find it. It is a short 1/2 second hiss sound, right before it starts up. Wierd?

Any help?

 

[maxdlx]

Just a guess, but it almost soungs like a compression leak. Maxdlx