Fine tuning the engine today, noticed that the frequency valve will not operate unless the CO adjustment is turned CCW-lean,. FV will then cycle on for about 4 seconds-fade off for a few seconds, and then back on. The engine runs rough compared to turning the screw a bit towards rich-it will then run smooth which is how I'm running it now-but the FV isn't on. After a little while I'll start the car and the FV will cycle (causing a major hunt in idle), but after the engine warms up it will shut off and not come back on at all. Bad O2 sensor? -----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/