the purge switchover valve located directly behind the windshield washer fluid reservoir is supposed to be working when you hear it tick like a little drum, or when you hold it in the hand you should feel it pulsating.

In my case I hear nothing, using a screw driver "stethoscope" and fell no pulse holding it. Engine was started cold at trial.

Is it dead if yes what is the consequence? I read that the purge valve handles excess fuel vapor retained in charcoal canister. I got no CEL and am wondering if there is a code thrown without CEL.

Any input greatly appreciated.

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE