"Rapping" Noise From Cylinders
SYMPTOM - "RAPPING" NOISE FROM CYLINDERS
| Possible Cause | Correction |
|---|---|
| Air in fuel system | Check fuel delivery system for leaks |
| Air in high pressure lines | Check fittings for leaks |
| Incorrect pump timing | See TESTS W/CODES article |
| Nozzle sticking in open position | Inspect and/or replace nozzle |
| Low nozzle opening pressure | Check nozzle operation; see SYSTEM/COMPONENT TESTS article |
| Excessive oil entering combustion chamber | Repair internal engine problem |
| Faulty ECT sensor | Check sensor operation; see SYSTEM/COMPONENT TESTS article |