1978-79 Models

Detach hose at regulator. Using mirror and flashlight, check to see that air passage in regulator is open. See Fig 1. Disconnect airflow sensor and turn ignition on. Air passage in regulator should close after 5 minutes. If not, replace regulator.

Fig 1: Checking Auxiliary Air Regulator

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Fig 2: Exploded View of 924 Mixture Control Unit

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Fig 3: Bosch CIS Fuel Injection System - Porsche (Typical)

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