All Plugs Fouling on Right Bank

clifftt said

I haven't tried that. What would that indicate?



That means the two idle mixture screws next to the pcv nipple are turned full counter clockwise, which is the richest setting.

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Technically, it isn't richer, per se. It is allowing more of the air/fuel mixture into the system. To change the A/F ratio you have to either change the bleed (add more or less air) or the restrictions on the fuel side of the circuit.