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Which variable did the vacuum advance respond to?

  • A.Engine load through manifold depression
  • B.Engine speed, which determines the depression within the manifold and therefore the advance required for combustion
  • C.Coolant temperature
  • D.Throttle position, which is sensed directly by a linkage between the throttle spindle and the capsule of the distributor

Answer: A

High depression means light load and a lean, slow burning charge that needs more advance. Throttle position and manifold depression are closely related, which makes the last option a plausible description of the same information by another route. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist.

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