Fuel Injected Engine

1. Disconnect vacuum hose from vacuum advance diaphragm A on the distributor, then connect suitable vacuum pump and gauge to the hose.
2. Start engine and allow to idle, then check for vacuum. Vacuum should be present. If no vacuum is present, check vacuum line for leaks, blockage or a disconnected hose.
3. Apply 20 inches Hg to diaphragm A and check timing. Timing should advance and remain steady. If timing does not advance, stop engine and remove distributor cap. Check breaker plate for free movement. If no binding is present, replace advance diaphragm.
4. Allow engine to run until cooling fan rotates, then disconnect vacuum hose No. 5 from vacuum advance diaphragm B on the distributor. Connect vacuum pump and gauge to the hose.
5. Allow engine to idle and check for vacuum. Vacuum should not be present. If vacuum is present, check for voltage at cold advance solenoid valve.
6. If voltage is present, replace ECU. If voltage is not present, replace cold advance solenoid valve.
7. Raise engine speed to approximately 1700 RPM and check for vacuum. Vacuum should be present. If vacuum is not present, check vacuum line for leaks, blockage or disconnected hose. If vacuum line is satisfactory and vacuum is still not present, check for voltage at cold advance solenoid valve.
8. If voltage is present, replace cold advance solenoid valve. If voltage is not present, check sensors and system wiring. If wiring is satisfactory, replace ECU.