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Smokin' 73 K5

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by magnum4x4, Feb 9, 2004.

  1. magnum4x4

    magnum4x4 Registered Member

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    Smokin\' 73 K5

    I just bought a 73 k5. I was told the 350 was rebuilt recently(or a newer motor swapped in, it has HEI). It has a small smoking problem upon startup and when I hammer the throttle. It runs nice and smooth from what I can tell. I also have a real bad exhaust smell, how can I tell if it is running rich or lean. The valve covers have like 2 or 3 extra breather holes open(what's that?). Thanks
     
  2. Confedneck

    Confedneck 3/4 ton status

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    Re: Smokin\' 73 K5

    what color smoke? white? black? blue??
     
  3. magnum4x4

    magnum4x4 Registered Member

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    Re: Smokin\' 73 K5

    mostly white, sometimes black but only for a second or two.
     
  4. Confedneck

    Confedneck 3/4 ton status

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    Re: Smokin\' 73 K5

    well black would be fuel.. as in running rich and not burning it all off...
     
  5. BlazerGuy

    BlazerGuy 3/4 ton status

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    Re: Smokin\' 73 K5

    White smoke sometimes means that steam is getting in the exhaust. Your head gasket may be leaking and needs replacing or maybe your head bolts just need tightening...or it could be a catalyst burning off fuel residue in which case your AIR injection is FUBAR but I'm pretty sure you don't have AIR on your 73....
     
  6. 4xcrazy

    4xcrazy 3/4 ton status

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    Re: Smokin\' 73 K5

    [ QUOTE ]
    what color smoke? white? black? blue??

    [/ QUOTE ]

    With all the engines i have had, i still have never seen "blue" smoke when burning oil. My last car, "88 Iroc Camaro with 165k miles" used oil and smoked at start-up, and now my current vehicle, the '89 Burb with 206k miles definately uses oil, smokes at start-up, and slightly after idling for a few minutes then the throttle is hit, it will smoke for a few seconds, but to me, this appears to be "white smoke. I do know that this is caused primarily due to bad/wore out valve seals which is common in the Chevy small blocks. Now i have had a head gasket or two go bad and leak down into the cylinders, and you can definately smell coolant vapors coming from the pipes. Now don't get mad at me, i am just saying,,,I don't see the blue???
     
  7. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Re: Smokin\' 73 K5

    It is a blueish/grayish smoke that you should see if it is burning oil. It isn't electric blue smoke but it does have a slight blue tint to it.
     
  8. SUBFAN

    SUBFAN 1/2 ton status

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    Re: Smokin\' 73 K5

    Is it white smoke or just vapor?

    I notice you live in a colder climate, could this be the issue?

    Pull and read the plugs for signs....
     

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