Potential answers for "Worrisome engine sounds"

⭐⭐⭐⭐ PINGS
⭐⭐⭐⭐ KNOCKS
⭐⭐⭐ PING
⭐⭐⭐ RATTLE
⭐⭐⭐ SPUTTER
⭐⭐ CLANG

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