240 L4-2127cc 2.1L SOHC Turbo B21FT FI (1982)
Warm Up Regulator: Description and Operation
This unit incorporates a diaphragm valve to provide the engine with an enriched air/fuel mixture during acceleration with a cold engine. Both sides of
the diaphragm are connected to the intake manifold, the underside through a delay valve. The pressure differential causes the valve to momentarily
reduce the control pressure, enriching the air/fuel mixture.