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EFI Models

  1. Disconnect vacuum hose No. 2 from vacuum advance diaphragm A. Connect vacuum pump/gauge to hose. Start engine and run at idle. There should be vacuum. If there is no vacuum, check vacuum hose for leaks, blockage or disconnected hose and retest.
  2. Apply 20 in. Hg vacuum to advance diaphragm A. Timing should advance and remain steady. If timing does not advance, check breaker plate for freedom of movement. If breaker plate moves freely, replace vacuum advance and retest.
  3. Warm engine until it reaches normal operating temperature (cooling fan operates). Disconnect vacuum hose No. 5 from vacuum advance diaphragm B. Connect vacuum pump/gauge to hose. Allow engine to idle and check for vacuum.
  4. There should be no vacuum. If there is vacuum, check for voltage at cold advance solenoid valve. If there is voltage, replace ECU and retest. If there is no voltage, replace cold advance solenoid valve.
  5. Raise engine speed to 1500 RPM and check for vacuum. There should be vacuum. If there is no vacuum, check vacuum hoses for leaks, blockage or disconnected hoses. Check for voltage at cold advance solenoid valve.
  6. If there is voltage, replace cold advance solenoid valve and retest. If there is no voltage, replace ECU and retest.
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