Practice question

What is the function of the PCV valve in a modern automotive engine?

  1. To regulate fuel pressure in the injectors
  2. To vent blow-by gases from the crankcase back into the intake air stream
  3. To control the engine idle speed
  4. To filter dirt out of the transmission fluid

Answer: B — To vent blow-by gases from the crankcase back into the intake air stream

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