740 L4-2.3L SOHC VIN 88 B230F (1985)
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Turn off engine.
Fig. 370 REMOVE CO ADJUSTMENT SEAL
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Drill two 2 mm (0.08 in.) holes in plug.
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Withdraw plug with circlip pliers.
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Start engine.
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Adjust CO content to 0.6 %.
Fig. 371 CO ADJUSTMENT
Counterclockwise reduces CO
Clockwise increases CO
Adjustment range = 15 turns.
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Connect Lambda sond
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Turn off engine.
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Disconnect test equipment.
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Install plug in exhaust pipe.