David - I don't think so ! the lambda relay is powered from the RPM-relay. When the engine is not running - the frequency valve is quiet. What he hears probably is the idle speed motor. Elvis The Lambda system, including the frequency valve, is powered when the key is on no matter if the motor is running or not. (snip) David Teitelbaum vin 10757 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/