Checks
| Action
|
Definition:
White, black, gray or blue smoke under load, idle or start up hot or cold.
|
Preliminary
Check
|
| • | Refer to Important Preliminary Checks. |
| • | Make sure the customer has an actual problem. |
| • | Check fuel quality. Refer to Specific Gravity Check in Fuel Systems. |
|
Fuel System
Checks
|
| • | Injection pump. Refer to Fuel System Diagnosis in Fuel Systems. |
| • | Check the injection pump timing. Refer to Fuel Systems. |
| • | Check the injection nozzles. Refer to Fuel Systems. |
|
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. |
|
