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

- Let engine idle about 2 minutes





- Remove connector 2 from connector 1 of throttle valve switch
- Slowly increase engine speed to about 4500 RPM
Connections in connector 2 not bridged

- Check CO and record
- 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:
- Break in wiring
- Temperature sender for engine temperature defective
- Control unit defective