Checks
| Action
|
DEFINITION: White, black, gray or blue smoke under load, idle or start up hot
or cold.
|
Preliminary Check
|
| • | Make sure the customer has an actual problem. |
| • | Check the fuel quality. |
|
Fuel System Checks
|
| • | Check the injection pump. |
|
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. |
|
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. |
|
