OPEL Engine Modification 1970-72: Description

Opel Exhaust Emission Control is achieved through leaning out air/fuel mixture in carburetor, a thermostatically controlled air cleaner (except 1972 GT), a dual acting (advance and retard) distributor vacuum unit, and mixture control during deceleration. Carburetors on 1.1 liter engines incorporate a vacuum operated diaphragm valve and an electronically controlled magnetic valve, both of which must be open so air/fuel mixture can be fed to manifold and combustion chamber.