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What does it mean when a diesel truck starts up and you get white smoke and or blue-ish purple smoke from the exhaust....i saw a bunch of people fighting on youtube comments about what it means and i was just curious because i don't know what it means? lol One guy said it's from reving it high when the engine is bone cold????
 

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Mine has a similar color while cold.Clears once it is warm though.
 

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If it's cold, white is usually glow plugs not working right (or just extremely cold).
-Aaron
 

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I have a glow-plug out on my truck....I have some white smoke when I start it on cold days. I plan on fixing this problem next week. Exhaust smoke that is white, can be caused from a variety of reasons.
 

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White usually from cold start. The blueish color is from oil.
 
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