Daniel, Remember the cold start valve spray fuel only when cranking, only when cold, and only for a set number of seconds. I don't think it would cause a backfiring problem since once the engine is running it is not used. D² & 6530 My fuel filter was replaced in August. About 2 months ago I was having a problem where the car wouldnt start when cold. It took many atempts to finally start. Dave Delman helped me with this problem locating a faulty electrical connection on the cold start valve. That seemed to correct the problem but I now get this backfiring. I'm thinking the cold start valve is going bad? [Non-text portions of this message have been removed] 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/