Just failed an emissions check (I am stuck on this one-interesting question)

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  • spoolin318i
    Member
    • Dec 2005
    • 96
    #1

    Just failed an emissions check (I am stuck on this one-interesting question)

    So I just got back and everything checked out great besides the hc (PPM) low speed run.


    My numbers are as follows

    Pollutant High speed/Low Speed
    HC (PPM) - 123/192 Standard (168/173)
    CO(%) - .53/.64 Standard (1.08/0.98)
    CO2(%) - 14.5/14.2 Standard (None/None)
    O2(%) - 0.1/0.5 Standard (None/None)
    NOx(PPM) - 444/868 Standard (1208/1323)

    Any thoughts on why one could fail the low speed but ace the other tests? I am really confused here :(
    Tags: None
    • jlevie
      R3V OG
      • Nov 2006
      • 13530
      #2
      Is the idle smooth or lumpy. A lumpy idle probably means misfires, which will cause high HC.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

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        • ptownTSI
          E30 Fanatic
          • Jun 2005
          • 1265
          #3
          high HC comes from unburned fuel. change the O2 sensor, plugs, ignition cap/rotor if they haven't been done in the last 40k miles or since you bought it.

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