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Old 06-07-2017, 11:42 AM   #1
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DT466 white smoke

I have a 1996 DT466 its still the mechanical engine. Its the 230hp variant. It runs and starts super but there is white smoke I notice at idle. The fuel must be 2-3 years old, could this be the fuel? Any other ideas?
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Old 06-07-2017, 11:48 AM   #2
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Blue smoke is oil, black is unburnt fuel, white is coolant

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Old 06-07-2017, 11:50 AM   #3
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white can be low temperature / low compression.. if you notice coolant loss it could be coolant, but diesels will smoke white if the injector spray patterns are off also..

I would put a bottle of Diesel-Kleen in it and some fresh fuel and drivei t like you stole it for a while to get it warmed up real good.. and then see howq it does the next day when its cold.
-Christopher
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Old 06-07-2017, 12:02 PM   #4
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Your post reminds me... to clarify, black smoke is scorched uncombusted fuel, white can be uncombusted fuel from lack heat and compression as Cadillac says

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Old 06-07-2017, 12:35 PM   #5
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That's correct. White smoke is unburned fuel, blue is engine oil getting into the combustion chamber and black is as you said excessive unburned fuel.

I'd drive that old fuel out first. The fuel treatment goes without mention.
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Old 06-07-2017, 12:55 PM   #6
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Check your fuel filters as well after you burn the old fuel. Diesel is a breeding ground for bacteria if there's any moisture contamination

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Old 06-07-2017, 01:03 PM   #7
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True the fuel filters are likely full of goop with that old fuel in there, but then the white smoke indicates fuel is actually getting to the cylinders.
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Old 06-07-2017, 01:31 PM   #8
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Always good to check all the filters if it's been sitting that long. Check the ph on the cooling system as well to make sure it's not going to eat your liner o-rings like mine did

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Old 06-07-2017, 02:53 PM   #9
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Anyone try this method of checking acidity?

Begin with a cold engine. Remove the radiator cap and start the engine.

Set your digital multimeter to DC volts at 20 volts or less.

When the engine reaches operating temperature, insert the positive probe directly into the coolant.

Rev the engine to 2,000 rpm and place the negative probe on the negative battery terminal.

If the digital meter reads .4 volts or less, your coolant is in good condition.

If it's greater than .4 volts, the electrolysis additives are exhausted, and you may be in the market for a new radiator, a water pump or a heater core in the future. All of those are far more expensive than a simple coolant change.
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Old 06-07-2017, 03:53 PM   #10
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This post is about diesel smoking causes and repairs, not testing antifreeze PH. Please stay on topic.
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