Air Control Valve

With ignition turned off, check solenoid by connecting it directly to battery. If clicking sound is heard, solenoid is normal. Attach pressure gauge as shown in illustration and proceed as follows:

1. Remove hoses from outlets "A" and "B". Start engine and run at idle. Check to see that pressure gauge reads 0.47 - 0.65 Ib./sq.in. (.033-.046 Kg./sq. cm.) and there are no air leaks from outlets "A" and "B".
2. Increase engine speed to 3000 RPM. Pressure gauge should now read 1.3-2.0 lb./sq.in. (.11-.14 Kg./sq. cm), and air should be coming from outlets "A" and "B".
3. Remove solenoid terminal. Pressure gauge should now read 0-.36 lb./sq.in. (0-.025 Kg./sq. cm), and air should flow from outlet "A" but it should not flow from outlet "B". Remove pressure gauge and connect hoses.