Vanagon Syncro AWD L4-2109cc 2.1L (1987)
Throttle Full Close Switch: Testing and Inspection
Full Throttle Enrichment, Checking
Checking Full Throttle Enrichment
Requirements
Engine oil temperature minimum 80°C (176°F)
RPM gauge connected
CO tester connected (if catalytic converter present;) on sampling point using Sun 120.239 adapter
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Let engine idle about 2 minutes
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Remove connector 2 from connector 1 of throttle valve switch
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Slowly increase engine speed to about 4500 RPM
Connections in connector 2 not bridged
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Check CO and record
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Bridge connections in connector 2 with square side of double adapter VW 1490
CO must raise at least 1 vol.% over recorded value
If NO, Check For:
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Break in wiring
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Temperature sender for engine temperature defective
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Control unit defective