Excessive Smoke

DEFINITION: White, black, gray or blue smoke under load, idle or start up hot or cold.

PRELIMINARY CHECK

^ Refer to Important Preliminary Checks. Testing and Inspection
^ Make sure the customer has an actual problem.
^ Check fuel quality. Refer to Specific Gravity Check in Fuel Systems. Testing and Inspection

FUEL SYSTEM CHECKS

^ Injection pump. Refer to Fuel System Diagnosis in Fuel Systems. Diesel MFI Pump
^ Check the injection pump timing. Refer to Fuel Systems. Adjustments
^ Check the injection nozzles. Refer to Fuel Systems. Testing and Inspection

SENSOR CHECK

^ Check the Engine Coolant Temperature (ECT) sensor using the scan tool to compare the engine coolant temperature with the ambient air temperature on a cold engine. If the coolant temperature reading is more than 5 greater or less than the ambient air temperature on a cold engine, check for a high resistance in the coolant sensor circuit or the sensor itself.
^ Check the glow plug system operation.

AIR INTAKE SYSTEM CHECK

^ Check the air cleaner and air intake ducts for restriction.
^ Check for a restriction in turbo charger inlet duct.
^ Check for a restriction in intake manifold.

ENGINE MECHANICAL CHECK

^ Check for incorrect basic engine parts such as cam, heads, pistons, etc.
^ Check for excessive oil entering combustion chamber.