Cyclic sound from turbocharger
| Cause | Remedy |
| Obstructed air intake duct to turbo compressor. | Remove obstruction or replace damaged parts as required. |
| Dirt caked on compressor wheel and / or diffuser vanes. | Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter. |
API are distributors for:
