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Emissions failure 1986 nissan 300zx

After swapping the motor in my nissan 300zx i failed emissions. I figured it was because the car and motor had been sitting awhile. my first test High speed HC 333 CO 3.75 Low speed HC 406 CO 0.07. I ran about 5-6 tanks of gas through it using lucas fuel system cleaner every other tank and changed the fuel filter twice. I replaced the distributor, rotar, cap, wires, and plugs during the motor swap. After flushing the fuel system i had it retested and failed again High speed HC 353 CO 4.16 Low speed HC 738 CO 3.86. I think the timing might be off a little. What would cause my emissions to get worse?

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  •  Brad
    Brad Jul 14, 2013

    You may need to repost your question. I know less about how this fixya site works than I'd like. No help menu here. But it seems that once anyone gives an answer to a question, that question is removed from the unanswered quick view list. And I can't figure out how other techs can find it & join the discussion. If you repost I'll not give an answer so some one else can try to help you out.

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SOURCE: Emissions failing with high NOx

You need to check the oxygen sensor. You car may be running lean and therefore giving you increased NOx levels

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