740 L4-2.3L SOHC VIN 88 B230F (1985)
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Adjust engine speed with idle adjustment screw to 700 rpm.
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Disconnect ground from test point.
Engine speed should increase to 750±20 rpm
If values are incorrect: check/adjust Throttle Body and/or Throttle Cable/Linkage.
Check/Adjust Ignition Setting
Idle speed fluctuations can affect ignition setting. Make sure that fluctuations are not greater than 25 rpm.
If greater, check air control valve hoses for blockages.
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Check ignition timing with stroboscope.
Ignition setting should be 12° BTDC at idle.
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Adjust setting by turning distributor body.
Check CO
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Disconnect Lambda sond
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Check CO-content.
CO-content = 0.4-0.8 %.
Adjusting CO
CO should only be adjusted after all possible faults have been checked/rectified.
