| Cause | Correction | |
| If the condition occurs at idle, the idle speed is set too low for accessories |
 |
Adjust the idle. |
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| high pressure fuel leak |
|
Inspect/correct leaks in the high pressure lines, fittings, injector sealing washers or delivery valves. |
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| One or more injectors worn or malfunctioning delivery valve |
|
Replace delivery valves. |
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| Malfunctioning injection pump |
|
Replace the pump. |