Practice question

What is 'engine knocking' (detonation) most commonly caused by?

  1. Correct ignition timing and proper fuel
  2. Uncontrolled, premature combustion, often from over-advanced timing, too-low-octane fuel or overheating
  3. A new air filter
  4. Fresh engine oil

Answer: B — Uncontrolled, premature combustion, often from over-advanced timing, too-low-octane fuel or overheating

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