Excessive Smoke

Checks	Action
DEFINITION: White, black, gray or blue smoke under load, idle or start up hot or cold.
Preliminary Check	Refer to Symptoms - Engine Controls . Make sure the customer has an actual problem. Check the fuel quality.
Fuel System Checks	Check the injection pump. Check the injection pump timing. Refer to Fuel Injection Pump Timing Adjustment . Check the injection nozzles. Refer to Fuel Injection Nozzle Diagnosis .
Sensor Check	Check the engine coolant temperature (ECT) sensor. Use the scan tool in order to compare the engine coolant temperature with the ambient air temperature on a cold engine. If the coolant temperature reading is more than 5 degrees more or less than the ambient air temperature on a cold engine, check for a high resistance in the coolant sensor circuit or the coolant sensor. Check the glow plug system operation. Refer to Glow Plug System Diagnosis .
Air Intake System Check	Check the air cleaner and the air intake ducts for restriction. Check for a restriction in the turbocharger inlet duct. Check for a restriction in the intake manifold.
Engine Mechanical Check	Check for incorrect basic engine parts such as the cam, the heads, the pistons, etc. Check for excessive oil entering the combustion chamber.