Excessive Smoke (Black)
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Excessive Smoke (Black)
| Inspection |
Action |
| DEFINITION: Black smoke under load, idle or start up hot or cold. |
| Preliminary Inspection |
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| Fuel System Inspection |
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| Sensor Inspection |
- 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, inspect for a high resistance in the coolant sensor circuit or the sensor itself.
- Turn ON the ignition with the engine OFF. Observe the actual fuel rail pressure with a scan tool. The actual fuel rail pressure should be between 1.0-1.8 MPa. If it is not, inspect for high resistance in the fuel rail pressure (FRP) sensor circuits or the FRP sensor. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems.
|
| Air Intake System Inspection |
- Inspect for a restriction in the air cleaner or the air intake ducts.
- Inspect for a restriction in the turbocharger charge air cooler.
- Inspect for a restriction in the intake manifold.
- Inspect for an air leak in the charge air cooler with a J 46091
charge air cooler tester.
- Inspect for an air leak in the air ducts between the turbocharger and the intake manifold.
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| Engine Mechanical Inspection |
- Inspect for incorrect basic engine parts such as the cam, the heads, the pistons, etc.
- Inspect for excessive oil entering the combustion chamber. Refer to Oil Consumption Diagnosis
in Engine Mechanical - 6.6L (LLY).
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