Choke - Electric Assist; Choke Return System; Hot Start Assist System - Mazda 1983 RX7 Service Manual

ARTICLE BEGINNING
1983 Exhaust Emission Systems
MAZDA RX7 CHOKE RETURN & HOT START ASSIST SYSTEMS
DESCRIPTION
The Choke Return system prevents the choke knob from being
left unreturned to prevent overheating of the exhaust system. The Hot
Start Assist system opens the throttle valve partially during
cranking of warm engine to optimize air/fuel mixture to improve
starting.
The choke return system components include No. 1 water
temperature switch, choke relay, choke magnet and choke switch. The
hot start assist system components include No. 1 water temperature
switch, hot start relay and hot start motor.
OPERATION

CHOKE RETURN SYSTEM

When cold engine is started with assist of choke knob, the
knob is held in pulled position by the choke magnet. Full release of
choke knob is achieved as engine coolant temperature reaches 158
ø
(70 C). The No. 1 water temperature switch stops the flow of
electrical current to magnet and the choke knob is released.

HOT START ASSIST SYSTEM

During cranking of a warm engine, the No. 1 water
temperature switch provides power to the hot start relay when starter
is engaged. When hot start relay is activated, the hot start motor
pulls the hot start cable which opens the throttle valve.

CHOKE - ELECTRIC ASSIST

Article Text
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 04:58PM
ø
F