| Answer | Crossword Clue |
|---|---|
| SMOKE | Sign of engine trouble |
| PING | Sign of engine trouble |
| PING | Sign of engine trouble, perhaps |
| PINGS | Signs of engine trouble |
| PING | Sound of engine trouble |
| CLUNKS | Engine trouble indicators |
| CLUNKS | Engine-trouble indicators |
| NOOIL | Engine trouble cause, maybe |
| NOOIL | Reason for engine trouble, perhaps |
