Exhaust Emissions System - Air Injection System: Description

NOTE: For 1974-78 models, see AIR INJECTION SYSTEMS article in this section.

The air injection system is designed to lower formation of HC and CO emissions. This is done by injecting additional fresh air into the exhaust ports to cause an afterburning of the exhaust gases and thus more complete combustion. System uses a fresh air intake filter, an auxiliary air pump (belt driven), a diverter valve, a check valve and necessary connecting lines.

Fig 1: 924 Air Infection System

Courtesy of PORSCHE CARS NORTH AMERICA, INC.