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