87 4 DLT ENGINE Black / Dark Grey at full load Black / Dark Grey at high load Black / Dark Grey any load Blue / White at light load Blue at light load / acceleration Blue any load Cause Check 1. Overspeeding 1. Maximum speed setting 2. Lub oil induction 2. Oil bath air cleaner for overfilling (Wherever fitted) 3. Choked Venturi 3. Venturi (Pneumatic Governor) is not restricted (Wherever fitted) 4. Retarded timing 4. Pump to engine timing, auto advance function 5. Incorrect atomisation 5. Injectors - see chart 6. Air Starvation 6. Air cleaner ducting restrictions; turbo operation 7. HP Pipes 7. Bore size; length; restrictions 8. Cold Engine 8. Thermostat : Cooling system, operation 9. EGR valve is permanently open 9. Functioning of valve, setting of EGR switch 10. Carbon deposition in intake system 10. Cleanliness of EGR valve, intake manifold 11. VSV valve not working properly 11. Vacuum connections to VSV and its functioning 12. Advanced Timing 12. Pump to engine timing; auto advance function 13. Poor Compression 13. Setting / condition of valves, piston rings + air intake 14. Overfuelling 14. F.I. Pump, excess fuel device 15. Incorrect Atomisation 15. Injector type / setting / condition 16. Poor combustion 16. Injector fitment 17. Retarded timing 17. Pump to engine timing; auto advance function 18. Lub oil passing pistons 18. Piston / ring/ bore condition 19. Lub oil passing valves 19. Valve stem / guide condition FAULT DIAGNOSIS SMOKE Symptom l l l l l l l l l l l l l l l l l l l l l l Speed Maximum Medium to Maximum Low to Medium All
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