Vacuum Advance Control Solenoid: Testing and Inspection

1. Run engine for more than one minute.
2. With engine running, check brown / slate (gray) wire at vacuum valve for voltage. Should have battery voltage.
3. Disconnect pink / white from valve at connector and test for voltage through valve. Should have battery voltage
4. Ground pink / white from valve. Valve should operate.
5. Check vacuum source to valve. Connect vacuum gauge to opposite port. With pink / white grounded, no vacuum should pass through valve.
6. Remove grounded wire and vacuum should pass through valve.
7. If results are not satisfactory, replace valve.