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Old 09-20-2013, 07:25 AM
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What might cause this?

Hey Guys,

I'm new to this forum. I recently purchased a 2008 F250, 6.4L. Currently has 105k on the engine. Shortly after I purchased it I noticed a blue-ish smoke pouring from the tail pipe as I drive down the road. No specific reason or time that it starts. It just does it randomly. It'll do it for a mile or 2 and it will stop. It's not a black smoke, it's blue colored. Would you happen to have any ideas on what this is caused from? I get some weird looks from passer by's when it does it.

I appreciate it.

CA
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Old 09-20-2013, 07:27 AM
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Is it in regen when this happens?
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Old 09-20-2013, 08:25 AM
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I don't want to sound ignorant but I'm not certain what regent means or how I would know? I apologize but I'm new to diesels.
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Old 09-20-2013, 10:08 AM
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Regen (Regeneration) is when the DPF (Diesel Particular Filter/Exhaust Filter) is cleaning it's self. There are two type of regens
1st is Passive. Your truck is always doing this. But temps must be hot enough to be effective. Maintaining RPMs above 1500 is ideal.
2nd is Active. When your truck is dumping raw fuel during the exhaust stroke on cylinders 7 & 8 making the exhaust gases hotter effectively burning the soot in the DPF. Truck performance is limited during this time. Some guess by 50-100HP and exhaust gasses can exceed 1300F. When my truck regens, I can feel it immediately.

Stop and go traffic is not good for the regen process. The lower exhaust temps allow the DPF to clog faster requiring more active regens. Note each time you do regen. The distance between regens should be between 250-600 miles and could last from 1-20 miles all dependent on the state of the DPF. If your regening much more than that or for longer distances then you may have a problem. * The numbers I added are "soft" numbers as every truck is different.

The wrong type of oil can also cause DPF failure. Stick with CJ-4 rated oil as your truck was designed to use..

Do you have oil in the tail pipe? Could be turbo seals, burnt valve, piston rings...

Last edited by DisposableHero; 09-20-2013 at 10:13 AM.
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Old 09-20-2013, 10:13 AM
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I appreciate the reply. I just noticed there is another thread with the exact same issues. I do not notice any oil leakage from what I can tell. Everything seems to be clean.
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