Air Pump Test; Check Valves Test; Air Control Valve Test - Mazda 1983 RX7 Service Manual

sensor as described in "Mazda RX7 Deceleration Control
System" article in this section.

AIR PUMP TEST

1) With engine at normal operating temperature, inspect all
hose connections for leaks. Check for pump noise and belt tension.
2) Stop engine and disconnect air line at air control valve.
Connect hose to a pressure gauge. Connect tachometer to engine.
3) Start engine and run at idle speed. Gauge should register
more than 1.64 psi (.12 kg/cm
pressure is below specification, replace air pump.

CHECK VALVES TEST

1) Check valves are located at the air control valve exhaust
port outlet and in the air supply line between the air control valve
and pellet converter.
2) To test exhaust port check valve, detach air pump-to-air
control valve hose at air control valve. To test converter check
valve, detach air control valve-to-pellet converter hose at air
control valve. Test each valve separately using the following
procedure:
3) With engine at normal operating temperature, connect
tachometer to engine. Detach hose for valve to be tested. Start
engine and increase engine speed to 1500 RPM. Watch for exhaust leak.
If leak exists, replace check valve being tested.

AIR CONTROL VALVE TEST

1) After ensuring air pump and all hoses are correct, check
carburetor and air control valve attaching nuts for tightness. Warm
engine to normal operating temperature.
2) Stop engine and connect a tachometer. Disconnect air
cleaner-to-air control valve hose at air cleaner. Disconnect both
vacuum hoses from relief solenoid valve (Blue color dot).
3) Using rubber hose, by-pass relief solenoid valve by
connecting vacuum lines on each side of relief valve together. See
Fig. 2. This will cause manifold vacuum to be routed directly to air
control valve.
4) Start engine and run at idle. Place finger over air
cleaner-to-air control valve hose and check that air is not escaping
through hose. Disconnect rubber hose used to by-pass relief solenoid
valve; air should escape at air cleaner-to-air control valve hose.
5) Reconnect by-pass hose at relief solenoid valve. Using
throttle, set engine speed at 2500 RPM. Disconnect vacuum sensing
tube from switching solenoid valve (Gray color dot).
6) Place finger over air cleaner-to-air control valve hose;
air should escape through hose. Reconnect switching solenoid valve
vacuum tube.
7) Air should not escape at air cleaner-to-air control valve
AIR INJECTION SYSTEM
Article Text (p. 2)
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 04:57PM
ý
) with engine at 800 RPM. If pump