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John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience:  A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
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Why does my 06 chevy turbo diesel emit white smoke when idiling

Resolved Question:

why does my 06 chevy turbo diesel emit white smoke when idiling
Submitted: 8 years ago.
Category: Chevy
Expert:  John replied 8 years ago.


It could be an oil consumption or an aftermarket computer calibration.Scan the engine & check for the latest GM calibrations.If necessary do an oil consumption test.Check out these systems.


Excessive Smoke (White)



DEFINITION: White smoke under load, idle or start up hot or cold.

Preliminary Inspection

Ensure the customer has an actual condition.
Check the coolant level in the reservoir. White coolant smoke may be mistaken for blue/gray smoke.
Compare the scan tool data at idle with the scan tool data list.

Fuel System Inspection

If excessive smoke is present, inspect for a stuck fuel injector.

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.

Air Intake System Inspection

Inspect the air cleaner and the air intake ducts for restriction.
Inspect for a restriction in the turbocharger charge air cooler.
Inspect for a restriction in the intake manifold.

Engine Mechanical Inspection

Inspect for incorrect basic engine parts such as the cam, the heads, the pistons, etc.
Inspect for coolant entering the combustion chamber.
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Customer: replied 8 years ago.

Checked oil and coolant levels prior to contacting you. They are ok. Just returned from an 1800+ road trip and averaged 21.7 mpl so I feel my truck is running OK except for the white smoke and diesel odor when idiling. Will check other suggested items as a process of elimination