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Message: [QUOTE="firehunter, post: 594397, member: 1162"] Yes, I know blue = oil, white = fuel, black = too much fuel, blah, blah. That isn't my question. My scenario is this. Blue smoke on cold start ups, has a fuel type smell - makes your eyes water, but is blue smoke, and never ANY smoke on warm starts. Engine starts, runs perfectly irregardless of temperature but amount (volume) of blue smoke is directly proportionate to outside temps until EGT's hit over 500*, then no smoke of any kind after that, even when it returns to idle. No white smoke ever. The truck started earlier this winter in -2*F on the GP's ONLY and ran fine. I have the hi idle tune and use it regularly but the EGT's never get warm enough for the smoke to stop so the high idle just raises the amount of smoke. The smoke started immediately after installing the injectors in sig. I am confident the injectors all got seated properly with soft taps from a mallet checked with a straight edge. Boost, EGT's, SOTP power is all perfectly normal. It just seems that something in the engine/turbo requires 500* to seal then it's fine. What could it be? I had the exhaust side side of the turbo let go twice on this truck but the turbo that is on their now is a relatively new (not rebuilt, NEW) center section with less than 10K miles on it. Yes, I have hit 25+ psi boost a couple of times but in general I am very easy on this truck. EGT's have NEVER, and I mean NEVER, in 211K miles been above 1200* for ANY period of time. Thoughts? Turbo? Injector or o-ring issue? Tuning? Sensor? TIA. [/QUOTE]

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