RX7 2RTR-1308cc 1.3L MFI (1991)
Fuel Pressure Control Solenoid: Description and Operation
Pressure Regulator Control (PRC) System
The Pressure Regulator Control Solenoid Valve, the middle unit of a group of three located on top of the engine, is an ECU controlled component of the
pressure regulator control (PRC) system.
The PRC system raises fuel pressure to prevent fuel percolation during hot engine restart. Under specified conditions, the ECU closes the solenoid valve
to block vacuum to the fuel pressure regulator. This raises fuel pressure by allowing the pressure regulator to control fuel pressure without vacuum
modulation.
Under the following conditions, the ECU activates the PRC system for approximately 50 seconds after starting:
1.
Coolant temperature above 65°C (149°F).
2.
Intake air temperature (engine sensor) above 45°C (113°F).
