RE: [DML] Idle mixture screw

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

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.)






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