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Old 02-25-2012, 06:53 PM
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BLUE SMOKE?

My 99 F250 7.3 is having some blue smoke. It will have a little blue tint with white smoke when started first thing in morning when not plugged in and temps are below 35 degrees. You can see a tiny bit when idling but I also get some blue smoke when I first pull out of driveway for the first couple of shifts. Once I hit third gear its all good then on. No more blueish color. It is good for the rest of the day as well. It also does not do it in the morning if its plugged in. Any ideas what is causing this?
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Old 02-26-2012, 10:55 AM
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Bump........
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Old 02-26-2012, 01:52 PM
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It could be your single shot injectors or valve seals because after it warms it as you say it's ok the rest of the day.

A cold engine is not properly burning the fuel or a cold engine the valve seals are not sealing when cold.
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Old 02-26-2012, 06:09 PM
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So the blue smoke can just be the unburnt fuel? Cause I know thats what the white is in morning. It smells like fuel but I thought the blue smoke just meant oil burning.
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Old 02-26-2012, 07:02 PM
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I have the identical symptoms and am curious what you come up with.
Me just thinking and havent tested, i wonder if it is a combo of bad injecrot orings for blueish smoke
and a bad gp causing white smoke while cold.

I might have different things going on though because of having 380k on the clock
and the PO said the engine was completely stock and unopened.

How long have those sticks been in there and have you gotten it hot?
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Old 02-26-2012, 07:17 PM
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I get the same thing on cold mornings. There was another thread on here a while back and everyone said it was normal and nothing to worry about. IDK
Mine is the exact same though, smokes blueish white on first start on cold morning, once warm no more smoke the rest of the day.
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Old 02-26-2012, 08:06 PM
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The injectors have been in there for 18 months. I hope it is normal and stops when it warms up.
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Old 02-26-2012, 08:10 PM
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I get a tiny bit of smoke on a cold start, too. Same white/gray/blueish...Once it's warmed up it goes away. It'll come back though if I let it idle for a while though (I'm thinking when the cylinders cool down enough, the fuel is not burning completely, b/c it won't do it if it's at the 1000 rpm cold idle.
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Old 02-27-2012, 05:17 AM
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I think we all bought diesel trucks and when its cold out there going to smoke a little bit off the bat until things get warmed up. I have works around farm equipment my whole life and i doesnt matter if its brand new or has 10,000 hrs on the clock they all smoke a little on cold mornings
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Old 02-27-2012, 07:46 AM
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I have quite a bit of smoke and a cyl misfire until it warms up.
I know i have a problem! Haha
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