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Which problem is characteristic of port free direct injection engines?

  • A.Carbon deposits on the inlet valves
  • B.Fuel dilution of the oil, which occurs because the fuel is injected at a low pressure into a cold cylinder
  • C.Poor economy
  • D.Increased particulate emissions, which follow from the incomplete evaporation of the fuel injected into the chamber

Answer: A

With no fuel washing the valve, oil vapour from the breather bakes onto it. Particulate emissions genuinely are higher and have required filters, which makes the last option a real and important characteristic of the same technology. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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