After a full tune up on vin 4258 I was still not passing emissions until I purchased a 3mm allen wrench and toned it down a little. I was surprised that I had to turn the idle mixture screw counterclockwise between 1/4 and 1/2 turn to get it under the passing threshold. My question is, what are the ramifications of having the screw set to where the CO reading is very low as opposed to just barely passing regulations? Is there anything else important I should know just in case this would cause premature engine damage. The car runs perfectly now as it did before (but no fuel stench when it's running in the garage.) 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/