Air-Fuel Idlle Adjustment

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I recently failed the States emission test. The hydrocarbons where over 1500 at idle. The States maximum is 800. I checked the timing and it's OK. I run the original spread bore carburator and the idle (air/fuel adjusting screws were both three and a half turns out. With a hand held tach I adjusted both screws evenly until I reached the highest steady RPM's as possible. Now the screws are six turns out. By letting the screws out did I make it richer or leaner? Any other suggestions I may try? The car passed the test under load. It only failed the idle test.

10/8/0211:11 AM

Original Post

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