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ryanhead

4.3 Smoking On Start

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Just bought a 2008 sierra with 4.3 and its puffing white kinda blue smoke on start after sitting four an hour or so. I know the older 350's had problems valve seals. The dipstick oil is so clean I'm unable to tell if its to full of oil. Anybody else have this problem?

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The 4.3 has not really changed all that much since 88 or so, a few tweaks here and there. That being said, the 4.3L is basically a 350 chopped in half. They were always puffing out a little smoke right at start up. Guess they still do in 2008. Probably would not hurt to run it by the dealer though if it is under warranty.

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It's also the valve seals just like the 350's and other small blocks. I had an older S-10 that did it for a long time. Never used enough oil to make it worth fixing. As long as it doesn't foul up the Cat Converters, I wouldn't worry too much about it.

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It's also the valve seals just like the 350's and other small blocks. I had an older S-10 that did it for a long time. Never used enough oil to make it worth fixing. As long as it doesn't foul up the Cat Converters, I wouldn't worry too much about it.

 

 

Naw new trucks shouldnt do that. It looks like it may be over filled with oil. Might just change oil and drop level. I had a 97 4.3 new years ago,never had a issue. But it will go back an vist the dealer

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I have had three 1999 's with the 4.3.

All three of them ran well over 100,000 miles and never did puff blue oil smoke on startup.

 

I have a 2006 now with the 4.3 It has 55,000 on it.

No smoke. At least not yet. :lol:

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engine break in period ?? - how many miles do you have on the truck ??

 

Less than 100 miles

 

 

You've got to allow for engine break in. Put some miles on it. See what happens

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That being said, the 4.3L is basically a 350 with a quarter chopped off.

 

Fixed, it's not a V4. :lol:

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