240 L4-2.3L SOHC VIN 88 B230F (1986)
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Disconnect Lambda sond
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Turn adjustment knob on Mono-tester to 4-cyl.
At correct CO level, pointer should move between 2O°-7O°.
Adjusting CO
CO should only be adjusted after all possible faults have been checked/rectified.
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Turn off engine.
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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 so that Mono-tester pointer moves between 2O°-7O°.
