Mazda RX7. Manual - part 40

 

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Mazda RX7. Manual - part 40

 

 

PCV SYSTEM

Article Text (p. 2)

1983 Mazda RX7

For www.iluvmyrx7.com    

Copyright © 1998 Mitchell Repair Information Company, LLC

Sunday, August 26, 2001  04:59PM

Fig. 1:  B2000 Pickup Crankcase Ventilation System

         TESTING

         PISTON ENGINES

         All Exc. GLC FWD
         With engine idling at normal operating temperature,
disconnect PCV valve hose at valve cover. Close off hose opening with
finger and check that idle speed drops. If idle speed does not drop,
replace valve.

         GLC FWD
         Remove PCV valve from valve cover. Blow through valve with
mouth pressure from valve cover side of valve. Air should pass
through. Blow through valve from opposite end. Air should not pass
through. If valve does not operate as described, replace valve.

         ROTARY ENGINES

         1) Disconnect purge valve-to-oil filler tube hose from purge
valve. Start engine and operate at idle speed. Place finger over port
"C" and check that air is not being drawn into port. See Fig. 2.
         2) Increase engine speed to 2000 RPM and check port "C". Air
should be drawn into port. If valve does not operate as outlined,
replace purge valve.

         MAINTENANCE

         Clean valve and check PCV system operation every 30,000
miles.

PCV SYSTEM

Article Text (p. 3)

1983 Mazda RX7

For www.iluvmyrx7.com    

Copyright © 1998 Mitchell Repair Information Company, LLC

Sunday, August 26, 2001  04:59PM

Fig. 2:  RX7 Rotary Engine Purge Valve
Air flow should be checked at port "C".

Fig. 3:  GLC & 626 Crankcase Ventilation System
Note direction of flow.

Fig. 4:  B2200 Diesel Pickup Crankcase Ventilation System

END OF ARTICLE

SPARK CONTROL SYSTEM

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com    

Copyright © 1998 Mitchell Repair Information Company, LLC

Sunday, August 26, 2001  04:59PM

ARTICLE BEGINNING

         1983 Exhaust Emission Systems
         MAZDA RX7 IGNITION CONTROL SYSTEM

         RX7 (Exc. Calif. Man. Trans.)

         DESCRIPTION

         The Ignition Control system is used to regulate vacuum
advance of leading and trailing distributor systems. In addition,
this system helps reduce CO and HC emissions by aiding pellet
converter warm-up during cold engine starts.
         System consists of leading and trailing components of
distributor system, vacuum control solenoid valve (except Calif. man.
trans.), No. 1 water temperature switch and connecting wiring and
tubing.

         OPERATION

         The Ignition Control system operates when engine is cold and
running between 1000-1200 RPM and when engine is hot during quick
deceleration from 3000 RPM.

         TESTING

NOTE:    For additional information and adjustments on distributor
         spark timing, see appropriate information in "Mazda RX7
         Tune-Up Service Procedures," article in this section.

         VACUUM CONTROL SOLENOID VALVE

         1) Disconnect vacuum sensing tubes from leading vacuum
control solenoid valve (Brown dot). Blow through solenoid valve from
vacuum tube "B" shown in Fig. 1. Air should escape at front port.
Trailing vacuum control solenoid valve (Green dot) is tested in the
same manner.
             2) Disconnect electrical connector from solenoid valve
and connect battery power to terminals on valve. Blow through hose
again. Air should escape through air filter at rear of valve. Replace
valve if it does not perform as outlined.

         VACUUM CONTROL SOLENOID VALVE

         SIGNAL CHECK

         1) Warm engine to normal operating temperature. Stop engine
and connect tachometer to engine. Connect voltmeter to negative
terminal of leading vacuum control solenoid valve (do not unplug
connector). Place auto. trans. vehicles in "P", man. trans. vehicles
in Neutral.
         2) Start engine and run at idle speed. Voltmeter should read

SPARK CONTROL SYSTEM

Article Text (p. 2)

1983 Mazda RX7

For www.iluvmyrx7.com    

Copyright © 1998 Mitchell Repair Information Company, LLC

Sunday, August 26, 2001  04:59PM

0V at idle. When transmission is shifted into any forward or reverse
gears, voltmeter should read near 12V.
         3) Increase engine speed to 2000 RPM. Slowly decrease engine
speed from 2000 RPM and watch voltmeter. Current should stop flowing
to solenoid terminals when engine speed is 1000-1200 RPM.
         4) Stop engine and disconnect No. 1 water temperature switch
connector (located behind alternator). Connect a jumper wire between
terminals of water temperature connector. Start engine and set engine
speed at 2000 RPM with choke knob.
         5) Unplug connector from No. 2 water temperature switch
(located on radiator). Check that the voltmeter reads near 12V when
the connector is unplugged from the switch. Disconnect jumper wire
and plug in No. 1 water temperature switch connector.
         6) Quickly decelerate engine speed from 3000 RPM. The
voltmeter should read near 0V during deceleration and at idle speed.
Trailing vacuum control solenoid valve (Green dot) is tested in the
same manner.

NOTE:    Before replacing vacuum control solenoid valve, check
         auxiliary control unit, No. 2 water temperature switch,
         choke switch and choke relay as described in "Mazda RX7
         Auxiliary Control Device," article in this section. Also
         check throttle sensor as described in "Mazda RX7
         Deceleration Control System," article in this section.

Fig. 1:  Testing Vacuum Control Solenoid Valve
Voltmeter and tachometer required for tests.

 

 

 

 

 

 

 

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