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  1. T

    Idle Emissions Help

    Thanks all for the help! Found a second small vacuum leak at the base, readjusted the idle screws, then bumped the RPM up to 1050 and it passed great.
  2. T

    Idle Emissions Help

    I had the air screws all the way in for that test. I followed the steps previously mentioned to get them back to where better adjustment since. Oil and plugs changed a couple months ago and only driving since then has been trying to pass emissions several times. Did not know I should be...
  3. T

    Idle Emissions Help

    You are right about it not sounding super clear yet, but hopefully this battle gets me closer to understanding. The engine was replaced by a prior owner, but it is about as mild as from the factory. The fluids were done just a few months ago and the cat looks pretty new, but I dont know. Just...
  4. T

    Idle Emissions Help

    Thanks all for the responses! Readings are Loaded 110 HC 0.51 CO (220 HC and 1.5 CO is the limit), but idle 4.18 HC and 4.08 CO (220 HC and 2.00 CO limit). Last night I was able to find/fix a small vacuum leak and get the idle screws estimated. Do not have a tachometer so I am going off...
  5. T

    Idle Emissions Help

    Dang you were fast. Completely did not even consider the throttle screw. Did have the timing adjusted when I first got it, but wont hurt to double check. I will try everything you said one by one. Thanks a ton for the advice!
  6. T

    Idle Emissions Help

    Hi all, hoping someone here will know where to point me. I am still pretty new to working on engines so I am at a bit of a loss. My tuck is a 79 C20 with a 350. It is doing great on the loaded readings (about 50% the limit), but both HC and CO are double the limit at idle. It was sitting for a...

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