KRYOTEC ENGINE 15 SMOKE DIAGNOSIS CHARTS The following charts include possible causes and corrections for excess or abnormal exhaust smoke.Small amounts of exhaust smoke (at certain times) are to be considered normal for a diesel powered engine. EXCESSIVE BLACK SMOKE POSSIBLE CAUSE CORRECTION Air filter dirty or plugged. Check and replace the filter if necessary. Air intake system restricted. Check entire air intake system including all hoses and tubes for restrictions, collapsed parts or damage. Repair/replace as necessary. Air Leak in Intake System. Check entire air intake system including all hoses and tubes for collapse, cracks, loose clamps, or holes in rubber ducts. Also check intake manifold for loose mounting hardware. Diagnostic Trouble Codes (DTC's) active or multiple, intermittent DTC's. (Refer to DTC-Based Diagnostics/ Module, Powertrain Control (PCM) - Diagnosis and Testing) Powertrain Control Module (PCM) has incorrect calibration. (Refer to DTC-Based Diagnostics/ Module, Powertrain Control (PCM) - Diagnosis and Testing) Exhaust system restriction is above specifications. Check exhaust pipes for damage/restrictions. Repair as necessary. Fuel grade is not correct or fuel quality is poor. Temporarily change fuel brands and note condition. Change brand if necessary. Fuel injection pump malfunctioning. A DTC may have been set. If so, (Refer to DTC- Based Diagnostics/Module, Powertrain Control (PCM) - Diagnosis and Testing) Fuel injector malfunctioning. A DTC may have been set. Perform "Injector Classification Programming" using scan tool. Also (Refer to DTC-Based Diagnostics/ Module, Powertrain Control (PCM) - Diagnosis and Testing) and, Return Fuel Quantity Test Fuel injector lower washer doubled or missing. Remove and inspect injector washer. Fuel return system restricted. Check fuel return lines for restriction. Intake manifold restricted. Remove the restriction. Manifold Air Pressure (Boost) Sensor or sensor circuit malfunctioning. A DTC should have been set. (Refer to DTC-Based Diagnostics/ Module, Powertrain Control (PCM) - Diagnosis and Testing). Turbocharger air intake restriction. Remove the restriction. Turbocharger damaged. Replace the turbocharger. Turbocharger has excess build up on compressor wheel or diffuser vanes. Clean or replace the turbocharger. Turbocharger wheel clearance out of specification. Replace the turbocharger.
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