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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

When diagnosing an engine that 'cranks but won't start', what are the three essential elements to check first?

The fundamental requirements for an engine to start are fuel, air, and ignition (spark for gas, compression for diesel). If any of these are missing or inadequa

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Question: When diagnosing an engine that 'cranks but won't start', what are the three essential elements to check first?

Answer options: ✅ Fuel, Air, Spark (or compression for diesel)

  • Oil pressure, Coolant temperature, Exhaust pressure
  • Battery voltage, Alternator output, Starter current
  • Ignition timing, Valve lash, Turbo boost

Correct answer: Fuel, Air, Spark (or compression for diesel)

Explanation: The fundamental requirements for an engine to start are fuel, air, and ignition (spark for gas, compression for diesel). If any of these are missing or inadequate, the engine will crank but not combust.

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