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Originally Posted by snmazer
I apologize for hijacking a thread but I have the same codes and when I start my Hummer I get a extremely loud hissing sound for several seconds then it goes away. If I turn off the heat or AC, the hissing immediately stops. Any idea what this may be? I see you guys are talking about a "purge valve" and was wondering if that may be whats causing my problem?
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I don't have a hiss...just trouble getting started after a gas-up. I've already replaced the 'usual suspects' (gas cap, evap solenoid)...I'm gonna do the purge valve tomorrow and see if that fixes anything.