Porsche 924 Workshop Manual page 149

924
B l eeding
1. Disconnect electrical connector at air flow
sensor terminal.
2. Disconnect electrical connector at control
pressure regulator, so that the control pressure
regulator wil l not heat up.
3. Let pressure gauge hang down (stretched hose
line) and turn on ignition.
4. Move operating lever of the change-over valve
between positions 2 and 3 about 5 times at
intervals of 10 seconds.
CHECKING "COLD" CONTROL PRESSURE
This test must be performed on a cold engine.
This test is absolutely essential for starting or
warm-up difficulties.
1. Move change-over valve to position 2.
2. Disconnect electrical connector at air flow
sensor termi nal.
Printed in Germany- X, 1982
Fuel Mixture
25
3. Disconnect electrical connector at control
pressure regulator, so that the control pressure
regulator will not heat up.
4. Turn ignition on.
5. Refer to the graph of the testing and adjusting
specifications on page 25 - 4 and 25 - 4 a for
pressure data at immediate outside temperatures.
6. Replace the control pressure regulator if measure-
ments are out of specifications.
CHECKING "WA RM" CONTROL PRESSURE
Engine can be warm or cold.
1. Move change-over valve to position 2.
2. Connect electrical connector to control pressure
regu lator.
3. Disconnect electrical connector at air flow
sensor terminal.
4. Turn on ignition and allow control pressure regu-
lator to heat up. When needle on gauge stops
rising, take reading.
Checking "Cold" Control Pressure
Checking "Warm" Control Pressure
25 - 7