| Cause | Correction | |
| Engine starting under laod |
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Disengage driven units |
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| Idle speed too low for accessories |
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Adjust the idle speed. |
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| Intake air or exhaust system restricted |
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Visually check for exhaust restriction and unspect the air intake. |
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| Air in the fuel sstem or the fuel supply is inadequate |
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Check the flow through the filter and bleed the system. Locate and correct the air source. |
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| Fuel waxing due to extremely cold weather |
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Verify by inspecting the fuel filter. Clean the system and use climatized fuel or fuel heaters. |
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| Contaminated fuel |
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Verify by operating the engine with clean fuel from a temporary supply tank. Drain and flush the fuel supply tank. |
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| Restricted fuel drain manifold or return line (Lucas CAV only) |
|
Check/correct the restriction. |