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failed emissions... troubleshooting help

Discussion in 'The Garage' started by irishraptor87, Jan 15, 2007.

  1. irishraptor87

    irishraptor87 1/2 ton status

    May 25, 2006
    Likes Received:
    hey guys hopefully you can give me a hand here

    my 1986 chevy k30 was put thru the CT emissions test so that i can register it, unfortunatly it failed

    a little info, 350 with bolt ons, intake, edlebrock carb

    we had to open the choke so that it would work properly, runs like **** on first start up, but like a charm when warmed, one of the passenger vaccume lines had to be plugged going to the carb so that it would run properly

    it sounds very good and i have gotten it into good shape, been workin on it for almost 2 months it seems

    i failed 2 parts of the CT emissions testing

    the gas cap was failed for leaking, which i assume i can just go pick up a plastic gas cap at wallyworld, problem solved

    but my idle was also failed.. thus being stuck

    the max idle mode limit is 450 (HC [PPM])
    my truck was measured at 962

    the other parts of the idle mode were perfectly fine, IE co% and RPM

    i dont honestly know what (HC [PPM]) means

    i am not sure what they are measuring and i dont know how to fix it

    a friend of mine mentioned that the problem may have to do with the fact that i dont have cats on my exaust, im not honestly sure

    any help would be appreciated
  2. sandawgk5

    sandawgk5 3/4 ton status

    Oct 28, 2003
    Likes Received:
    Kitsap County PACNORWEST
    HC is Hydro Carbons ( unburnt fuel mainly) With no cats HC will be high put cats on it and they will drop significantly. PPM is Parts Per Million so for every 1 million air sizes there are 962 sizes of hydro carbons if that makes since. Your running rich could also be a culprit of the high HC.


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