Engine RPM will not reach rated speed
| Cause | Correction | |
| Engine overloaded |
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Verify high idle speed without load. Investigate operation to be sure correct gear is being used. |
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| Malfunctioning tachometer |
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Verify engine speed with tachometer - correct as required. |
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| Throttle linkage worn or incorrectly adjusted. |
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Adjust linkage for stop-to-stop fuel control lever travel. |
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| The problem occurs after placing the fuel control lever pump, incorrectly indexed lever (Bosch VE only) |
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Check / correct fuel control lever indexing. |
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| High speed stop screw incorrectly adjusted |
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Check / set high speed stop screw. |
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| Partially engaged mechanical shutdown lever. |
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Check/place shutdown lever in run position. |
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| Inadequate fuel supply |
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Check the flow through and filter to locate the source of the restriction. |
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| If the condition is intermittent, restricted manifold drain line (Lucas CAV DPA only) |
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Check/remove restriction. |
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| Malfunctioning injection pump |
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Replace pump. |