240 L4-2.3L SOHC VIN 88 B230F (1986)
Counterclockwise reduces CO
Clockwise increases CO
Adjustment range = 15 turns.
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Seal CO adjustment screw
Always use a new plug.
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Push plug into position.
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Disconnect test instruments.
Volvo Workshop Service and Repair Manuals
Mass Air Flow Sensor <--> [Air Flow Meter/Sensor] >
< CO% Adjustment Using Test Diode|Page 2556
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