| Answer | Crossword Clue |
|---|---|
| PINGS | Knocking engine sounds |
| RAPS | Knocking sounds |
| CLACKS | Knocking sounds |
| DRONES | Engine sounds |
| ROARS | Engine sounds |
| PUTTPUTTS | Engine sounds |
| PURRS | Engine sounds |
| PINGS | Engine sounds |
| VROOMS | Engine sounds |
| HUMS | Engine sounds |
| CHUGS | Engine sounds. |
| PURRS | Good engine sounds |
| PURRS | Smooth engine sounds |
| PINGS | Worrisome engine sounds |
| KNOCKS | Worrisome engine sounds |
| PINGS | Unwelcome engine sounds |
| PINGS | Dreaded engine sounds |
| PURRS | Well-tuned engine sounds |
| CLANKY | Making hitting sounds, as a engine |
| CHUGS | Sounds from the little engine that could |
