Dan, The FV is like an injector spraying fuel back into the return line going to the tank as told to by the Lambda system ( 02 ). It relives the pressure in the lower chamber of the fuel distributor which in turn leans or enriches the fuel going to the injectors. Poor performance, hard to start. Normally if it's buzz zing it's ok. Before I would replace it I would replace the 02 sensor and see what happens. They very seldom go out. John Hervey www.specialtauto.com -----Original Message----- From: stainlessilusion [mailto:5n-@xxxxxxx] Sent: Sunday, January 30, 2005 9:00 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Frequency valve Qs Can someone describe to me what symptoms would be typical of a bad frequency valve? Anyone know how much voltage is supposed to be coming from the wires that plug into the valve? Thanks guys -----Dani B. #5003 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/