Vanagon F4-1970cc 2.0L (1982)
Air/Fuel Mixture: Testing and Inspection
US & Canada Except California
Checking And Adjusting Idle Speed And CO %, (except Calif)
Preconditions:
Engine oil temperature min. 60°C (140°F)
Intake air sensor must be 20°C (68°F)
All electrical equipment must be OFF
Hose for charcoal filter must be disconnected and blocked at air filter
Dwell and timing OK
Note: When vehicle has been parked outside at temperatures below 10°C (50°F), adjustment must wait until intake air sensor has reached room
temperature 20°C (68°F)
Work sequence
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Connect tach/dwell meter according to manufacturer's instructions
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Check idle speed and if necessary adjust with adjusting screw (arrow)
Manual transmission: 800-950 rpm
Automatic transmission: 850-1000 rpm
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Connect CO meter according to manufacturer's instructions
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Connect CO probe ahead of catalytic converter at probe receptacle
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Check CO and if necessary adjust at adjusting screw (arrow)
1.0 ±0.5%
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Secure CO adjusting screw with blue cap
Note: If CO cannot be adjusted following components may be defective:
Injectors
Spark plugs