Steve Bryant
Member
I previously posted a problem describing the odd hissing noise on my 04 ST. The noise was mostly noticable on coasting throttle or when slowing down to stop.
I asked our fleet maintainence guy what it could be? He nailed it the first try. The hissing noise is made when the EVAP purge valve opens to pull vac on the fuel tank vent or some such thing. It's considered "normal", however like all of you, it was driving me mad. He also suggested a simple fix. Take a clean shop rag or rip the tail of a "T" shirt to provide a strip of cloth 6 inches wide and 2.5 ~ 3 feet in length.
Wrap the EVAP purge valve with the cloth snugly.(The purge valve is located on the driver side mounted on the inside fender wall in front of the fuse panel. It has two vac hoses attatched to it from the lower part of the valve and has a vented cage cap on the top) The cloth wrapping serves as a "muffler" for the audable hissing but still allows the valve to "breathe" as is required for proper operation.
I have mine wrapped up. It still works, but I can't hear it working. Thats all I asked for in the first place.
I asked our fleet maintainence guy what it could be? He nailed it the first try. The hissing noise is made when the EVAP purge valve opens to pull vac on the fuel tank vent or some such thing. It's considered "normal", however like all of you, it was driving me mad. He also suggested a simple fix. Take a clean shop rag or rip the tail of a "T" shirt to provide a strip of cloth 6 inches wide and 2.5 ~ 3 feet in length.
Wrap the EVAP purge valve with the cloth snugly.(The purge valve is located on the driver side mounted on the inside fender wall in front of the fuse panel. It has two vac hoses attatched to it from the lower part of the valve and has a vented cage cap on the top) The cloth wrapping serves as a "muffler" for the audable hissing but still allows the valve to "breathe" as is required for proper operation.
I have mine wrapped up. It still works, but I can't hear it working. Thats all I asked for in the first place.