1977 Models
- Connect pressure gauge and valve assembly as in cold engine control pressure test. On Turbo Carrera, unplug mixture control unit connector.
- Control pressure should increase slowly to 38-44 psi (2.7-3.1 kg/cm2 ). Time will vary with ambient temperature. If pressure does not reach specified level, replace control pressure regulator.
- On 911S and 924, be sure that control pressure regulator is connected. Disconnect airflow sensor. Turn ignition on. Allow control pressure regulator to heat up/When indicator gauge stops rising, take pressure reading. Pressure should be 50-55 pi (3.5-3.9 kg/cm2 ). If not, replace regulator.