Checks
| Action
|
DEFINITION: Gray
or blue smoke under load, idle or start up hot or cold.
|
Preliminary Check
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• | Make sure the customer has an actual problem. |
|
Fuel System Checks
|
• | Inspect the fuel injection pump. |
• | Inspect the fuel injectors. |
|
Sensor Check
|
• | Inspect the engine coolant temperature (ECT) sensor. Use the scan
tool in order to compare the ECT 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 sensor itself. |
• | Inspect the glow plug system operation. |
• | Inspect the fuel rail pressure (FRP) sensor. Use the scan tool
to observe FRP with the engine OFF. FRP should be near 1.4 MPa.
If not , inspect for high resistance in the low reference or 5-volt reference
circuits or the sensor. |
|
Air Intake System Check
|
• | Inspect the air cleaner and the air intake ducts for restriction. |
• | Inspect for a restriction in the turbocharger charged air cooler. |
• | Inspect for a restriction in the intake manifold. |
|
Engine Mechanical Check
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• | Perform the cylinder leakage test. |
• | Perform the cylinder compression test. Proper compression is more
than 2157 kPa (313 psi). |
• | Inspect for incorrect basic engine parts such as the cam, the
heads, the pistons, piston rings, and valves. |
• | Inspect for excessive oil entering the combustion chamber. |
|
Turbocharger
| Inspect for leaking seals in the turbocharger. A slight film on the
intake side is normal.
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