Spark Control System; Vacuum Control Solenoid Valve; Vacuum Control Solenoid Valve Signal Check - Mazda 1983 RX7 Service Manual

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
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 04:59PM