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Smoking 350

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 86K5TrailBlazer, May 8, 2001.

  1. 86K5TrailBlazer

    86K5TrailBlazer 1/2 ton status

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    Well I have only had the Blazer a month now, but I've noticed that every so often when I turn the engine off black smoke starts to spew out of the intake, it appears like its coming thru the carb but also or maybe the e-manifolds but the valve covers dont seem to be leaking. Anyone know what I could be looking for.

    ps I replaced the PCV valve just in case but to no avail.
     
  2. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    I don't know if yours is doing what mine did exactly...but my old 350 about 2 months before it blew up did close to the same thing. It was because I needed a value job. Once I did that it worked great until that dang rod punched 2 holes in the dang engine! [​IMG] Might wanna check to see if that could be it?

    "Suck Fumes Ford Boy"
    "I love my country, I fear my government"
    <A target="_blank" HREF=http://www.chevycagal.homestead.com/steph.html>http://www.chevycagal.homestead.com/steph.html</A>
     
  3. BlazinRojo

    BlazinRojo 1/2 ton status

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    I had the same problem and it was due mostly to the valve covers leaking (the intake leaks a bit too). Some Hi-temp silicon solved te problem.
     
  4. 86K5TrailBlazer

    86K5TrailBlazer 1/2 ton status

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    Thanks for the tips. Thing is it seems to run pretty decent, passed smog pretty well too. Im gonna check it out this weekend. Also my carb starts making a clicking sounds after a few minutes of being on, it does it even at idle after warming up a bit, is that normal. Once again thanks. This board rocks.
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    The ticking noise is likely the MC solenoid, (once again) if yours HAS one, and is normal.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Since the carb is pretty much (or should be) sealed from the outside, you are probably dealing with a leak from somewhere. If you are getting a bunch of oil through the PCV valve (which can happen) you may have a leak in the hose to the carb from PCV, or the carb base gasket may be leaking out excess oil, it "puddles" underneath the carb, as well as "carbons up" where the PCV port is in the carb.

    After running, you WILL get some smoke out of the valve covers if you were to pull the breather or PCV valve. Your breather IS connected to the air cleaner as it should be?

    Since its smoke, the oil must be hitting something hot, so you just need to find the source obviously...if you can see smoke, you should be able to track it down pretty easily, especially with the air cleaner off, IF its coming from the carb area.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     

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