25 / 948
KRYOTEC ENGINE
16
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.