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Which record helps diagnose an intermittent misfire?

  • A.The service history, which indicates when the ignition components were last replaced during the life of the vehicle
  • B.Nothing
  • C.A recorded data log taken during a road test, which captures the conditions present at the moment the fault occurs
  • D.Freeze frame data captured when the code was set

Answer: D

Freeze frame stores speed, load, temperature and fuel trim at the moment of the fault, which narrows the search greatly. A road test data log genuinely is the next step, which makes the last option a real and complementary technique. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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