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Which symptom does a purge valve stuck open produce?

  • A.Uncontrolled vapour reaching the engine, which enriches the mixture and is worst when the canister is fully loaded
  • B.A rich mixture and unstable idle, worse after refuelling
  • C.A lean mixture, which follows from the additional air drawn through the canister into the inlet manifold
  • D.Nothing

Answer: B

A stuck open valve delivers vapour when the engine cannot tolerate it. The last option explains exactly why it is worst after refuelling, which makes it a correct and more diagnostic version. The shared behaviour explains why these belong together and the differences explain why both exist. Naming what changes and what stays the same is the reliable route through questions of this shape. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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