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Old 03-30-2008, 02:42 PM
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Blowing white/blue exhaust smoke...

I noticed today that my truck (97 7.3 PSD) was blowing a little color out the pipe. I know blue is oil and white is coolant but my fluid levels are perfect. I also just got ALL the fluids done last week. The truck runs great and is even getting pretty good gasmilage (so it seems). Any ideas of what could cause the color? Is this something I should worry about or have checked out. Its not like clouds of white but Its enough to notice if your looking at the exhaust pipe.
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Old 03-30-2008, 02:44 PM
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Is it while ideling when the engine is cold?
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Old 03-30-2008, 03:03 PM
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Thats when i noticed it, yes. I'm not sure if it goes away when shes warm but ill be sure to check tomorrow if it matter at all.
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Old 03-30-2008, 03:05 PM
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Yeah thats normal at startup and more noticeable when its cold out.
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Old 03-30-2008, 03:09 PM
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Ok, I figured that was the deal but just wanted to make sure that she wasn't burning coolant because I would be really pissed if that was the case haha, thanks again man!
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Old 03-30-2008, 03:11 PM
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You bet! Its actually unburnt fuel till the engine warms up
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Old 03-30-2008, 03:19 PM
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How does unburnt fuel get out like that? Cause the plugs arent warm enough?
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Old 03-30-2008, 03:24 PM
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Yeah a diesel engine has no spark to ignite the fuel its strickly by compression and until the engine is warm it will blow by unburnt fuel. Its more noticeable with a tuner or chip and when its cold out.
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Old 03-30-2008, 03:24 PM
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very doubtful for a 7.3 to be burning coolant , unburnt fuel can be white smoke
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Old 03-30-2008, 03:27 PM
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Ok thanks guys, really helpful!
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