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Thread: 85 2.6l 4x4 failed smog

  1. #1

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    06-04-2016
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    Mountain Center, California
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    1985 Dodge Ram 50
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    Smile 85 2.6l 4x4 failed smog

    Hi all,

    My 85 failed smog. On the first try;
    co2 14.40 o2 0.67 hc 61 co 0.20 no 1135 at 15mph
    co2 14.40 o2 0.66 hc 57 co 0.20 no 1052 at 25mph

    On inspection of the Mikuni carb, I found a leaky fuel pump, which explained the smell of gas all the time, as well as non-working accelerator pump. The truck would stumble on acceleration when warm or cold but ran ok otherwise..

    After repair:

    co2 14.02 o2 0.84 hc 51 co 0.22 no 1536 at 15mph
    co2 13.86 o2 0.72 hc 43 co 0.27 no 1317 at 25mph

    Now runs well but still failed


    Any suggestions?

    Thanks in advance

  2. #2

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    06-15-2014
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    Adelaide, South Australia
    Vehicle

    1985 Mitsubishi L200
    Engine

    G63B
    Looks like the usual suspect in this problem - the EGR valve and gallery are fouled up. If the exhaust gas recirculation isn't operating properly it will mess with the gas readings.

  3. #3

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    Mountain Center, California
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    1985 Dodge Ram 50
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    Ok, thanks for the info. That will be next on my hit parade.

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