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Failed emission, c02 at idle 25% to high

Discussion in 'The Garage' started by Rolled, Dec 8, 2005.

  1. Rolled

    Rolled 1/2 ton status

    Joined:
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    Location:
    Anchorage, Alaska
    I need some suggestions on where to start to fix this.

    1982 K20
    350
    465
    m code heavy emissions
    no cat, egr, or canistor from factory

    Here are the results of the test -

    ------------HC ppm--------------C02%
    ------------Limit-----Reading-----Limit-----Reading
    1000 rpm---1000-----141---------2.00-----2.48<----Fail
    2500 rpm---1000-----63----------2.00-----1.58


    Where would you start to fix this? My guess is to rebuild the carb and adjust it as good as I can.

    The motor runs very well and appears to be good enough to pass. It was a mess when I bought it but I got it running very well and I am pretty sure the internals are *good enough*

    I just need this to pass before I put a emission illegal motor in ;)


    Anyways, any advice before I start throwing money at it?
     
  2. fatbob

    fatbob 1/2 ton status

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    Phoenix, Az
    I just went through the same thing. Put some acetone [see actone thread] in the tank, 2.5OZ per 10gal. Adjust carb with vacuum gauge for highest vacuum, put in new air filter and I passed.:D
    But here is a good diagnostic page.

    http://www.recarbco.com/technical/smog/smoginfo.html

    PS. I still have those transmission parts for you. Did you ever do anything with that 305? Email me and I'll get 'em to ya.
     
  3. gmtech954

    gmtech954 Registered Member

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    ct shoreline
    you could also put 2 bottles of rubbing alcohol in at 1/8 tank itll pass with flying colors without a 5 gas analyzer its hard to tune perfectly for emmisions
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    E-town baby!
    Turn the idle speed up to 800 or so and try again. That will clean up your idle numbers...

    Rene
     

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