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Old 12-16-2007, 10:12 AM
paulfireboss's Avatar
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Join Date: Dec 2007
Location: florida
Posts: 10
1983 sl issue with adjusting c/o stem

I need to know what is the starting point on the c/o screw to start adjusting in a fine tune. I know counterclockwise is to lean out. Is there a starting point such as so many turns one total lean is reached? Thanks

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Old 12-17-2007, 04:16 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316

I hope you aren't trying to adjust the mixture by feel or by going super-lean and then back a bit. That's a prescription for disaster.

There is only one way to adjust it correctly, with a 45-50% duty cycle reading from Pin 3 on the diagnostic socket. It's standard procedure on 1981-91 cars with K-Jet.

Please do a Search, there are dozens of posts on how to do this.

Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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