Vanagon Syncro AWD F4-2109cc 2.1L (MV) (1989)
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Connect CO tester to adapter on left exhaust pipe, using Sun tool 120.239 or equivalent
Work Procedure:
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With ignition switched off, disconnect oxygen sensor connector (1) and idle stabilizer control valve connector (2)
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Check idle speed rpm, correct if necessary using adjusting screw (1)
specification: 880 ±50 rpm
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Check CO content
specification: 0.7 ±0.4% vol.
For CO adjusting, remove screw cap as follows:
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Drill CO adjusting screw cap using 2.5mm (0.098 in) drill
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Thread 3mm (0.137 in) sheet metal screw into drilled hole
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Grasp screw with pliers, pull out cap
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Set idle speed and CO content by alternately turning adjusting screws (1 and 2) to obtain specifications
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Reconnect oxygen sensor connector and idle stabilizer control valve connector
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Let engine idle approx. 2 minutes
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Check CO content, correct if necessary by repeating adjusting procedure