Automatic Temperature Control Air Cleaner
When air temperatures are above 100°F, the sensor acts to partially open valve. When air temperatures get higher, and exceed 118°F, the valve fully opens, stopping the supply of hot air from the exhaust manifold and allowing under hood air into the carburetor. In this way the heated and non-heated air is mixed so as to keep the carburetor air temperature at about 109°F. During heavy throttle operation, the valve opens the cooler air passage regardless of inlet temperature.
NOTE:
The following tables show the operation of each control switch under vehicle operating conditions. Two charts are shown; one for manual transmissions with gear switches, and one for automatic transmissions with speed detector and speed switch.
| OPERATING CONDITION | TEMPERATURE SENSING SW | THROTTLE SW | THIRD GEAR SW | SPARK TIMING | ||||
|---|---|---|---|---|---|---|---|---|
| (1)Switch detecting close throttle position | Switch detecting wide open throttle position | "Advanced" | "Retarded" | |||||
| Engine start and warming up (cold start) | OFF (below 34°F) ON (above 50°F) | ON | ON | OFF | X | -- | ||
| Engine start (hot start) | OFF | ON | OFF | X | -- | |||
| Idling | OFF | ON | OFF | X | -- | |||
| Cruising or accelerating in 3rd gear with partially open throttle | ON | ON | ON | X (below 34°F (above 50°F)X | ||||
| Cruising or accelerating in 1st, 2nd, and 4th "gear with partially open throttle | ON | ON | OFF | X | -- | |||
| Cruising or accelerating with wide open throttle | ON | OFF | ON (3rd) OFF (1st, 2nd, 4th) | X | -- | |||
| Coasting | OFF | ON | ON (3rd) OFF (1st, 2nd, 4th) | X | -- | |||
| Remarks | When the temperature of passenger compartment is below 34°F, this switch is "OFF." And when the temperature is above 50°F, the switch is "ON." | When the throttle valve is nearly closed, this switch is "ON." When the valve is slightly opened, the switch is "OFF" | When the throttle valve is opened more than 30 degrees for PL510 and WPL510, and 40 degrees for PL521, this switch is "OFF." | When the shift lever is in 3rd gear, this switch is "ON." And when the lever is in another gear position, the switch is "OFF." | When the "retarded" spark timing is provided, HC emission is reduced. | |||
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2SM018
SPARK CONTROL SYSTEM OPERATION (510 & 521 MANUAL TRANS.)
| OPERATING CONDITION | TEMPERATURE SENSING SW | THROTTLE SW | SPEED SW | SPARK TIMING | ||
|---|---|---|---|---|---|---|
| Switch detecting close throttle position | Switch detecting wide open throttle position | "Advanced" | "Retarded" | |||
| Engine start and warming up (cold start) | OFF (below 34°F) ON (above 50°F) | ON | ON | OFF | X | -- |
| Engine start (hot start) | OFF | ON | OFF | X | -- | |
| Idling | OFF | ON | OFF | X | -- | |
| Cruising or accelerating over 13 mph with partially open throttle | ON | ON | ON | X (below 34°F) (above 50°F X | ||
| Cruising or accelerating under 13 mph with partially open throttle | ON | ON | OFF | X | -- | |
| Cruising or accelerating with wide open throttle | ON | OFF | ON (above 13 mph) OFF (below 13 mph) | X | -- | |
| Coasting | OFF | ON | ON (above 13 mph) OFF (below 1.3 mph) | X | -- | |
| Remarks | When the temperature of passenger compartment is below 34°F. this switch is "OFF." And when the temperature is above 50°F, the switch is "ON." | When the throttle valve is nearly closed, this switch is "ON." And when the valve is slightly opened, the switch is "OFF." | When the throttle valve is open more than 35 degrees, this switch is "OFF." | When the car speed is under 13 mph, this switch is "OFF." And the speed is over 13 mph, the switch is "ON." | When the "retarded" spark timing is provided, HC emission is reduced | |
2SM019
SPARK CONTROL SYSTEM OPERATION 510 AUTO. TRANS.