Mazda 1983 RX7 - Hot Idle Compensation System; Mazda Hot Idle Compensator Valve

HOT IDLE COMPENSATION 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 PISTON ENGINE
HOT IDLE COMPENSATION SYSTEM
All Models
DESCRIPTION
The Hot Idle Compensation System supplies additional air to
intake manifold under hot idle conditions to maintain smooth idle and
reduce emissions. A bi-metal valve in air cleaner opens passage from
air cleaner to intake manifold. When this happens, fresh air mixes
with rich air/fuel mixture (caused by sustained idle) and creates
better combustion. Valve opens between 145-160 ø F (63-71 ø C).
TESTING
HOT IDLE COMPENSATOR
When engine is cold or air temperature is normal, detach air
hose from intake manifold and try to pull air through with vacuum
pump. No air should pass through compensator. Using a heat lamp, heat
valve to temperature above 155 ø F (69 ø C) and try to pull air through
hose. Air should pass through compensator. If not, replace
compensator.
Fig. 1: Mazda Hot Idle Compensator Valve
END OF ARTICLE