Quote:
Originally Posted by James Hart
HC ppm is raw, unfired fuel, CO% is rich mixture running out of oxygen before fuel is completely burned... how are the plugs, wires, cap, rotor, coil, etc? It has to be missing to have HC that high.
You could try raising your idle a bit to see if that helps.
I'm going through the similar here in Ocean County NJ on my 93 K1500 Blazer (still looking to score a 67-72 Chevy at some point). I just bought it, tried a couple things and still failed (4 trips so far). I'm just going to replace EVERYTHING spark & emissions wise before heading back next weekend. It's got 172k on it and no real service records for the last 50k+ (original owner wrote novels of records for the first 110k+ of it's life)
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Plugs wires cap rotor module etc are all new. I did a total tune up on it when I got it since it had been sitting for a couple of years and the PO had no idea how old anything on it was. Seems to run fine and I don't hear or feel a miss anywhere. Starts easy hot or cold, idles fine, seems like plenty of power. When I pulled the old plugs they were all light tan and no signs of internal engine trouble.
I haven't tried to mess with the carb yet. I think that is my next try. It has 2 adjustment screws for idle mixture. I just have to find instructions for how to adjust it.
I raised the idle to 1000 for this test too.