The modern diesel engine is very sophisticated and often difficult to diagnose even with the assistance of advanced diagnostic equipment. Most vehicles generate computerised fault diagnostics which don’t always isolate the exact cause or source of the fault or failure.
Below is a guide that may help point you in the right direction.
| Possible cause | Hard/non start | lack of power | rough at idle | diesel knock | black smoke |
|---|---|---|---|---|---|
| Low compression | x | ||||
| Low fuel pressure | x | x | |||
| Insufficient fuel delivery | x | x | |||
| Fuel restriction / blockage | x | x | |||
| Contaminated diesel | x | x | |||
| Air in fuel system | x | x |
Black smoke is generally due to an imbalance in the air to fuel ratio. Either too much fuel is being delivered into the engine or there is not enough clean air.
Common causes are:
White smoke is often caused by the fuel being injected into the cylinder not buring correctly.
Common causes are:
Blue smoke is the result of engine oil burning
Common causes are:
It is always advisable to seek the advise of a qualified technician as soon as possible.
Breakdowns and consequential costs and damages can most often be prevented.
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