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Test 1 - Engine Starts But Will Not Run Properly

  1. Disconnect vacuum hose at control unit. Check ignition timing. Ignition timing of 10-14° BTDC is acceptable (set at 12° BTDC). Check advance by increasing engine speed and observing whether timing advances. If necessary, substitute a new control unit and re-test.
  2. Check vacuum advance. Run engine at approximately 1500 RPM with vacuum hose disconnected. Reconnect vacuum hose and ensure that timing changes. If not, check vacuum line for cracks or poor connections.
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