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Which precaution applies when checking timing with a strobe?

  • A.None
  • B.Warm the engine fully, which is required because the timing changes considerably as the engine reaches temperature
  • C.Disconnect the vacuum advance if the data requires it
  • D.Run the engine at its maximum speed, which ensures that the whole of the advance mechanism has taken effect

Answer: C

Base timing is quoted at a specified speed with the vacuum pipe removed and plugged on many engines. Running at operating temperature genuinely is specified too, which makes the last option a real part of the same procedure. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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