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Mazda RX7. Manual - part 39

IDLE COMPENSATION SYSTEM

Article Text (p. 3)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:59PM

Fig. 3: Throttle Opener

AIR CONDITIONER SOLENOID VALVE TEST

1) Disconnect vacuum sensing tubes from solenoid valve and
vacuum port (rear of valve). Blow through vacuum hose and ensure air
passes through valve and escapes from air filter. See Fig. 4.
2) Disconnect solenoid valve electrical connector and apply
battery power to terminals. Blow through hose again. Air should pass
through valve and escape from rear port. See Fig. 4. If valve does not
respond as outlined, perform signal check.

IDLE COMPENSATION SYSTEM

Article Text (p. 4)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:59PM

Fig. 4: Testing Air Conditioner Solenoid Valve

AIR CONDITIONER SOLENOID VALVE SIGNAL CHECK TEST

1) Warm engine to normal operating temperature. Stop engine
and connect tachometer. Connect a voltmeter to the air conditioner
solenoid valve (White color dot) negative terminal. Start engine and
turn air conditioner on.
2) On automatic transmission models, current should NOT flow
to solenoid valve at any engine speed. On manual transmission models,
increase engine speed to 2000 RPM with throttle.
3) Slowly decrease engine speed and watch voltmeter.
Voltmeter should read near 0V when engine speed is 1000-1200 RPM. If
valve does not respond as outlined, replace air conditioner solenoid
valve.

NOTE: Before replacing air conditioner solenoid valve, check
auxiliary control unit as outlined in "Mazda RX7 Auxiliary
Control Device" article in this section.

AIR CONDITIONER RELAY TEST

Man. Trans. Only
1) Disconnect electrical connector from air conditioner
relay. Using an ohmmeter, check continuity between terminals.
2) With engine off and no power applied, there should be

IDLE COMPENSATION SYSTEM

Article Text (p. 5)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:59PM

continuity between No. 1 and No. 5. There should be no continuity
between No. 1 and No. 3.
3) Connect a wire from battery positive post to terminal No.
2 and battery negative post to terminal No. 4. There should be
continuity between No. 1 and No. 3. There should be no continuity
between No. 1 and No. 5.

Fig. 5: Air Conditioner Relay Terminals (Manual Transmission Only)

THROTTLE OPENER TEST

1) Switch off all accessories. Remove fuel filler cap.
Disconnect and plug idle compensator tube at air cleaner. Connect
tachometer to engine and warm engine to normal operating temperature.
2) Disconnect electrical connector from switching solenoid
valve (Gray color dot). Disconnect and plug vacuum sensing tubes from
vacuum control units on distributor (except Calif. Man. Trans.).
3) Turn air conditioner off. Disconnect electrical connector
from air conditioner solenoid valve and connect battery power to
solenoid terminals.
4) With battery power applied to solenoid terminals, throttle
opener should increase engine speed from idle to 1150-1250 RPM (in
Neutral). If engine speed is not within specification, turn adjusting
nut on throttle opener arm until engine speed is within specification.

END OF ARTICLE

PCV SYSTEM

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:59PM

ARTICLE BEGINNING

1983 Crankcase Ventilation
MAZDA

B2000, B2200, GLC, 626, RX7

DESCRIPTION & OPERATION

PISTON ENGINES

The PCV system includes 2 hoses and a PCV valve. Air
normally flows out of the valve cover hose, through the PCV valve and
into combustion chambers. A hose from the air cleaner to the valve
cover supplies fresh air to the crankcase.
When intake manifold vacuum drops due to heavy loads, the
amount of blow-by exceeds the capacity of the PCV valve. Air then
flows directly from the valve cover into the air cleaner and
carburetor. When engine is not running, the PCV valve is closed and
vapors are stored in the crankcase.

ROTARY ENGINES

The system used on the rotary engine (RX7) is also a closed
system and operates basically the same way as the piston engine
arrangement.
Filtered air is drawn into the system through the air
cleaner, mixed with the gases and vapors that blow by the rotor
during engine operation, and is drawn out through a purge valve and
into the intake manifold. The purge valve operates as the PCV valve
in this system.

DIESEL ENGINE

The PCV system on diesel engines consists of a hose to the
air intake from the cylinder head cover. All blow-by gases are
introduced into the air intake and prevented from entering the
atmosphere. There is no testing the PCV system on the diesel engines.
Hoses should be kept free of obstructions.

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