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Accord & Prelude (Auto. Trans. Only)

  1. Connect vacuum gauge to vacuum hose 2 and raise engine to 3500 RPM. If there is vacuum, go to step 2  ). If there is no vacuum, check for obstruction in carburetor body port.
  2. Connect vacuum gauge to hose 5 and start engine. If there is vacuum, go to step 3  ). If there is no vacuum, check for obstruction in vacuum hose.
  3. Attach vacuum pump to fitting where hose 5 connects to vacuum advance diaphragm and start engine. Draw 6 in. Hg vacuum. If timing retards, test is complete. If timing does not retard, replace vacuum advance diaphragm and retest.
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