Blue smoke at start up
10-06-2008, 02:04 AM
#1
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Blue smoke at start up
This is the first time I've noticed this happen. My truck had sat for 2 days, and when I started it up yesterday blue and white smoke puffed out for a second.
What would be the cause of this?
What would be the cause of this?
10-06-2008, 08:17 AM
#2
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It's usually caused by worn valve seals, which let a small amount of oil into the cylinders. This burns off when you start up. If they're only slightly worn it happens when the engine cools down and a vacuum builds up in the cylinders. As they get more worn they start to leak all the time and you're oil level goes down.
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