Vanagon 2WD L4-2109cc 2.1L (1986)
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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)
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specification: 880 +/- 50 rpm
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check CO content
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specification: 0.3 - 1.1%
For CO adjusting, remove screw cap as follows:
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drill CO adjusting screw cap using 2.5 mm (0.098 in.) drill
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thread 3 mm (0.137 in.) sheet metal screw into drilled hole
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grasp screw with pliers, pull out cap
Set idle speed and CO content by alternately turning adjusting screws 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
Check oxygen regulation function as follows:
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remove hose (1) from pressure regulator (2) and plug. CO should increase briefly, then drop in value.
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secure CO adjusting screw with new safety cap