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Emission Control System

Installed in model years 1970/71

Definition

Emission Control System

Function

Reduces exhaust gases via timing change-over and fuel shut-off under deceleration conditions...

29 – Working Current Relay

This relay controls the Fuel Shut-off Solenoid on the back of the Fuel Injection Pump

9 – Two-way Valve

This device is controlled by the Speed Relay, 17 degree and 100 degree switch. This device has 2 vacuum connections. The inner connection routes to the throttle body (vacuum). The outer vacuum connection routes to the distributor. This device controls vacuum advance/retard on the distributor under varying conditions (rpms, temps, etc…). When coasting above 2400 Rpms the 2-way valve influences the distributor timing which burns fuel more effectively and reduces emissions

4- Speed Relay & 5- Relay Box

These relays control the electrical “on/off” switching of the 2-Way Valve

17 Degree Switch

The 17 Degree Switch operates via the Speed Relay & Relay Box. The 17 degree switch (screwed into the lower section of the engine block by the ip pump) helps to warm a cold engine by increasing the idle (increases rpms) via the 2-way valve. This switch operates via the emission control devices (Speed Relay & 2-Way Valve) and thus rendered useless if the emission control devices are removed.

100 Degree Switch

The 100 Degree Switch operates via the Speed Relay & Relay Box. The 100 degree switch (screwed into the top of the radiator thermostat housing) increases the idle (via the 2-way valve) when engine gets hot. Basically, it makes the radiator fan spin faster (via increased rpms) increasing air flow and thus cooling of the engine. This switch operates via the emission control devices (Speed Relay & 2-Way Valve) and thus rendered useless if the emission control devices are removed.

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