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o2 sensor

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by txbluethunder, Feb 25, 2002.

  1. txbluethunder

    txbluethunder 1/2 ton status

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    this may sound like a dumb question but i was looking to replace my o2 sensor yesterday (engines been running like $hit lately) and i noticed...i don't have one? did the 86 305's come with one and its been removed and the manifolds have been swapped or did it never have one?

    1986 K5 Blazer
    Tired Stock 305/700R4/3.08
    F:2.5" Procomp Springs/RS9000
    R:1.5" Procomp Leaf/2" Procomp Block/RS9000
    Working on getting 33's
     
  2. BurbinOR

    BurbinOR 3/4 ton status

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  3. txbluethunder

    txbluethunder 1/2 ton status

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    cool...just wanted to make sure. what does the computer adjust the fuel settings in the carb to then?

    1986 K5 Blazer
    Tired Stock 305/700R4/3.08
    F:2.5" Procomp Springs/RS9000
    R:1.5" Procomp Leaf/2" Procomp Block/RS9000
    Working on getting 33's
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    86 doesn't have computer control on the carb. It will have a knock sensor ignition though so you will fine a ECU behind the glove box for that.
    I would start with a tune up first. Plugs, Wires if they are old cap and button and set the timming.
    Your carb will have a mix control solonoid and those can give you fits. It's rebuildable but if your not into that then pull the choke element and get a rebuild for about a 79-80. No mix control on those. easy to convert to electric choke. Has all the right ports to hoot to your emmisions and as long as you don't have a real snoopy Emmisions Nazi that has a clue they will never know the difference.


    Women dig dents and flat paint!
    coloradok5.com/gallery/Grim
    75 Jimmy, Dollar
    Grim-Reaper
     
  5. txbluethunder

    txbluethunder 1/2 ton status

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    ok, so what is the mix control solinoid (sp?) controlled by?

    also, anyone every order from carbs.net? good, bad, ugly?

    1986 K5 Blazer
    Tired Stock 305/700R4/3.08
    F:2.5" Procomp Springs/RS9000
    R:1.5" Procomp Leaf/2" Procomp Block/RS9000
    Working on getting 33's
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    carbs unlimited (carbs.net) is right down the street from me. Pretty knowledgable guys. I'd rebuild a carb myself though, they are pretty pricey, although probably no more than any other carb specialty shop.

    Your truck, if it has a plug for mix control, as far as has been determined via manuals and personal experiences, is governed only by engine temperature. I believe GM called it a "dual capacity pump" or some such, from my understanding it just limited the primary rods operation when the vehicle wasn't up to normal operating temperature. (coolant sensor)

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  7. txbluethunder

    txbluethunder 1/2 ton status

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    very good...thank you all for your posts...

    1986 K5 Blazer
    Tired Stock 305/700R4/3.08
    F:2.5" Procomp Springs/RS9000
    R:1.5" Procomp Leaf/2" Procomp Block/RS9000
    Working on getting 33's
     

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