ENGINE STARTS, IDLES ROUGH WITHOUT UNUSUAL NOISE OR SMOKE
| Possible Cause | Correction |
|---|---|
| Incorrect slow idle adjustment. | Reset slow idle adjustment. See ADJUSTMENTS article. |
| Leaking injection line. | Check fittings and/or replace line. |
| Plugged fuel return line. | Remove restrictions. |
| Air in lines to nozzles. | Check line fittings. |
| Air in injection pump. | Check pump fittings and pump operation. |
| Faulty nozzle. | Replace nozzle. See I - SYS/COMP TESTS article. |
| Improper or contaminated fuel. | Remove and replace fuel. |
| Uneven fuel distribution. | Check fuel delivery system. |
ENGINE STARTS, IDLES ROUGH WITHOUT UNUSUAL NOISE OR SMOKE
ENGINE STARTS AND IDLES WITH EXCESSIVE NOISE AND/OR SMOKE
| Possible Cause | Correction |
|---|---|
| Incorrect pump timing. | Adjust pump timing. See ADJUSTMENTS article. |
| Restricted air filter. | Check and/or replace air filter. |
| Air in injection lines to nozzles. | Check fittings on lines. |
| Faulty nozzle. | Replace nozzle. See I - SYS/COMP TESTS article. |
| Improperly installed high pressure lines. | Remove lines, and reinstall properly. |
ENGINE STARTS AND IDLES WITH EXCESSIVE NOISE AND/OR SMOKE
"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. |
| Nozzle sticking in open position. | Inspect and/or replace nozzle. |
| Low nozzle opening pressure. | Check nozzle operation. See I - SYS/COMP TESTS article. |
"RAPPING" NOISE FROM CYLINDERS
EXCESSIVE NOISE WITH BLACK SMOKE
| Possible Cause | Correction |
|---|---|
| Incorrect pump timing. | Adjust pump timing. See ADJUSTMENTS article. |
| Incorrect pump housing pressure. | Check pump for internal leaks. |
| Defective injection pump. | Replace injection pump. See I - SYS/COMP TESTS article. |
EXCESSIVE NOISE WITH BLACK SMOKE