I thought it would be something different because I saw my mechanic using what looked like a long screwdriver to turn the screw while he had a "Fluke" meter attached to some of the "pins" or whatever you call those things under that screw-off cover on the driver's side firewall. It has 6 or so female pin receptacles under the screw-off cap.

Is that how you adjust the air/fuel mixture? I'd have thought you'd have to have an exhaust gas analyzer to do it?

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Thanks,
Ron Brooks