Vin4258, The adjustment could have been far out to begin with. Normally I adjust counter clock very little with the car hot and the 02 sensor unplugged until the car starts to shutter as if your chocking it down on gas and then clock back up till it smoothes out. Again normally the adjustment should be very little. Then plug the 02 back in and it should idle smooth. Any question, your welcome to call. John Hervey www.specialtauto.com -----Original Message----- From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of vin4258 Sent: Tuesday, December 13, 2005 12:25 AM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Idle mixture screw 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/