| Cause | Correction | |
| Contaminated fuel |
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Verify by operating the engine with clean fuel from a temporary tank. Drain and flush fuel supply tanks. |
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| Worn or malfunctioning injection pump |
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Visually check fuel delivery with an externally connected injector to one of the pump outlets. Replace the pump if fuel is not being delivered. |
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| Injection pump out of time |
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Check/time the pump. |
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| Valves incorrectly adjusted |
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Adjust valves. |
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| One or more injectors worn or malfunctioning |
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Check/replace injectors. |
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| Engine compression low |
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Perform a compression check to identity the problem. |