Air Suction System: Description
NOTE:
Also see TOYOTA AIR INJECTION SYSTEM article In this section for Information on air injection system.
Used on 1977 3K-C engine, the system directs air into exhaust ports of engine to promote burning of hydrocarbon (HC) and carbon monoxide (CO) emissions still present in exhaust gases. This air is also used as the source of oxygen for use by the catalytic converter.
All 1978-79 models (except 1979 Supra) use an air injection or air suction system to supply fresh air at the exhaust ports to burn HC and CO remaining in the exhaust gases.