| Cause | Correction | |
| Additional loading from malfunctioning accessories |
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Check/repair accessories and vehicle components. |
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| Operator technique |
|
Review operation for correct gear shifts, deceleration and idling. |
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| Poor quality fuel |
|
Make sure quality no. 2 fuel is being used. |
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| Inadequate intake air or exhaust restriction |
|
Refer to Troubleshooting Logic for excessive exhaust smoke. |
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| Fuel pump timing |
|
Check/time the pump. |
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| Worn or malfunctioning injectors |
|
Check/replace injectors. |
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| Valves not seating |
|
Check/adjust valves. |
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| Malfunctioning power functions |
|
Check/repair power functions. |