1974 Models
- Disconnect hose from air cleaner-to-deceleration control valve (at valve). See Fig 1. With engine at idle, ensure there is no vacuum at control valve port. Stop engine.
- Disconnect hose from air cleaner-to-coasting valve and plug vacuum port of deceleration control valve. With engine at idle, disconnect solenoid wire from anti-afterburn valve. Hold hand over suction hose of anti-afterburn valve, no suction should be felt.
- Stop engine. Reconnect solenoid wire and hose to deceleration control valve. Disconnect hose from intake manifold at anti-afterburn valve and plug air suction port.
- With engine at idle, disconnect wire from coasting valve solenoid. Hold hand over opening of air suction hose of deceleration control valve. Vacuum should be felt. Reconnect all hose and wires.
Courtesy of MAZDA MOTORS CORP.