Smoke at startup
11-15-2011, 02:41 PM
#11
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Sort of a white gray, blue mix.
I have not pulled the throttle body. Is this difficult to do? Do I need gaskets or something to get it back on?
Have you pulled the TB and looked into the intake? I have seen oil puddle and then when it gets to a certain point get sucked into the heads in large amounts. Causing smoke on initial start up.
11-15-2011, 02:54 PM
#13
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Went out to follow your instructions, and it started raining! I will check this out as soon as it stops.
11-15-2011, 03:35 PM
#14
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You won't need a new gasket when you do take it off. Too get
it clean you will have to remove it, but to check for access oil you can do as Atomic instructed.
11-16-2011, 08:14 AM
#19
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I am running 10W-30 Valvoline, and have since new. Remember, though, this problem showed up last year and went away for 8-9 months - did not use a drop of oil or smoke at all, then returned, which leads me to believe it is not rings or valve guides or seals - those do not just fix themselves for no reason.
Oh, no doubt! Lots of black soot in the tailpipe, too. Like I said, a few weeks ago it was not using a drop of oil, and now it is guzzling oil like a sailor after pay day! 
I was just answering an earlier question.
And it is still raining! No rain for three weeks, and then somebody asks me to do something outside, and it will not stop. I need a garage. Is the purpose of this check to see if it is sucking oil up through the PCV (actually, orifice, no "valve," it's a 2005).
Also, valve seals - is there a test for this? I have changed valve seals on an older Pontiac before - it was easy since I had to pull the heads for something else, and I bought this awesome but too expensive tool for valve spring compressing when the head is off the vehicle, but changing them on the vehicle sounds like a pain, and I would like to avoid it if possible. I do not know how to check the valve seals.
That would be OIL.
I was just answering an earlier question.Also, valve seals - is there a test for this? I have changed valve seals on an older Pontiac before - it was easy since I had to pull the heads for something else, and I bought this awesome but too expensive tool for valve spring compressing when the head is off the vehicle, but changing them on the vehicle sounds like a pain, and I would like to avoid it if possible. I do not know how to check the valve seals.
Last edited by Junkyard Dog; 11-16-2011 at 08:20 AM.
11-16-2011, 08:22 AM
#20
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2005 GMC Yukon with 4.8
. . . I noted also that there appears to be a tube that goes from the passenger side valve cover to right behind the throttle body at the front of the intake manifold. Couldn't the engine be sucking oil from there just as easily as from the PCV (or orifice)?
. . . I noted also that there appears to be a tube that goes from the passenger side valve cover to right behind the throttle body at the front of the intake manifold. Couldn't the engine be sucking oil from there just as easily as from the PCV (or orifice)?
Why would the PCV issue happen only at start up? It seems to me that it should smoke anytime there is a high vacuum situation. This is very confusing.