Discussion
Which symptom does a valve stuck open produce?
Answer: C
Recirculation at idle destroys combustion stability. The last option explains exactly why, which makes it a correct and more instructive version. A stuck closed valve raises nitrogen oxides instead. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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