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  • emission testing

    I took my truck in to have it tested and it failed the hydrocarbon part. it tested 4.73 and the limit is 2.20. I know the
    o2 sensor is bad so I got a new one, the problem is I broke the old one trying to get it out. I'll try and get that later. After a little research though, that might not have been the issue anyway.
    Eventhough it passed the visual inspection of presence of a catalytic converter, it doesn't have one. The previous owner probably removed it because I didn't. So, my question is, is 4.73 HC a lot? Would some new spark plugs and a cap & rotor clean it up, or am I going to have to put a converter on it?
    On the CO test it had 13.50 and the limit is 55.00 and the NOx it had 2.10 with a limit of 3.50
    Thanks
    also boost will make the cam act smaller

  • #2

    Re: emission testing

    Yeah, I used to do a lot of smog work and yes, your HC is on the high side and could be for a variety of reasons. While a tune up wouldn't hurt, a missing converter is really going to drag you down, in terms of HC content. Another thing, believe it or not, a fresh oil change could help slightly as well.
    sigpic"Take most people, they're crazy about cars† I'd rather have a goddam horse. A horse is at least human, for God's sake."

    Jerome David Salinger

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    • #3

      Re: emission testing

      The O2 might clean it up enough to pass, but the missing cat is hurting across the board.
      Escaped on a technicality.

      Comment


      • #4

        Re: emission testing

        I'm finding that a converter can reduce HC by up to 90% but regulations only require it to operate at 70% efficiency. So I think a converter would really help. I just don't feel like doing that if there is an easier way. I just changed the oil not that long ago, maybe 900 miles. Does anyone have any idea what percentage a tune-up could account for?
        also boost will make the cam act smaller

        Comment


        • #5

          Re: emission testing

          Just get a few gallons of alcohol and pour it in the tank.....

          To bad it's fuel injected, if it had a carb and you could adjust the timing I could tell you a few things to do........My '71 Camaro when I used to drive it passed Emissions with 2% on the CO, and 61 HC and I didn't have cats............ And that was a 10.5:1 350 with a 300 duration cam.........

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          • #6

            Re: emission testing

            I've heard about people adding stuff to their tank, but a couple of gallons?
            For some reason I'd like to be in full compliance......but my goal is really to get my license plate re-newed.
            also boost will make the cam act smaller

            Comment


            • #7

              Re: emission testing

              CH3NO2 maybe?
              Last edited by BBR; April 13th, 2012, 11:59 AM.

              1973 F-250 460/C6 -Camper Special 1983 Mustang GT 545/C6 - 10.46 @ 130 - Drag Week 2012 - Street Race BB N/A runner-up

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              • #8

                Re: emission testing

                LOL, I didn't see on my sheet where they tested for nitric acid.
                also boost will make the cam act smaller

                Comment


                • #9

                  Re: emission testing

                  I've heard about people adding stuff to their tank, but a couple of gallons?
                  For some reason I'd like to be in full compliance......but my goal is really to get my license plate re-newed.
                  My friend had an 80's S10 the thing failed every year, he would put 3 gallons of Methanol or Ethanol in his tank with 10 gallons of gas and he'd go throw with flying colors.......... And I mean flying colors, it barely registered any readings.............

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                  • #10

                    Re: emission testing

                    I just got a new set of spark plugs, cap & rotor, and an air filter... I have a new set of wires that I'll use too. I might try to put something in the tank too, but 3 gallons per 10 gallons? I'm leaving next week and the place is closed on Mondays so it might be a little while until I can get back there.
                    also boost will make the cam act smaller

                    Comment


                    • #11

                      Re: emission testing

                      HC is usually the result of a misfire, high CO is running rich.

                      Put a converter on it and you'll probably fix it. But the tune up stuff is a good idea if it's been a long time. A flaky wire, half fouled or excessively worn spark plug, etc can make HC go up a bit like you're experiencing.

                      In the old days, it was fun to watch the needles on my 1970s Sun machine drop when the cat warmed up. 90% reduction in HC and CO is typical, sometimes more.
                      Last edited by squirrel; April 13th, 2012, 03:14 PM.
                      My fabulous web page

                      "If it don't go, chrome it!" --Stroker McGurk

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                      • #12

                        Re: emission testing

                        I just got a new set of spark plugs, cap & rotor, and an air filter... I have a new set of wires that I'll use too. I might try to put something in the tank too, but 3 gallons per 10 gallons? I'm leaving next week and the place is closed on Mondays so it might be a little while until I can get back there.
                        You might get away with using less, but that is how we did it...........Made lots of old Benz's pass that way......

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                        • #13

                          Re: emission testing

                          unplug an injector
                          go back.
                          without a cat it sounds raspy obnoxious anyway. what is a skip going to do?

                          Atomization is excitement, not temperature.

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                          • #14

                            Re: emission testing

                            HC is usually the result of a misfire, high CO is running rich.

                            Put a converter on it and you'll probably fix it. But the tune up stuff is a good idea if it's been a long time. A flaky wire, half fouled or excessively worn spark plug, etc can make HC go up a bit like you're experiencing.

                            In the old days, it was fun to watch the needles on my 1970s Sun machine drop when the cat warmed up. 90% reduction in HC and CO is typical, sometimes more.
                            I changed the plugs and they all came out with a white chalk on them, the cap and rotor where a different story though. The rotor was so worn that it was noticably shorter than the new one and the termanials in the cap had a lot of build up on them.
                            also boost will make the cam act smaller

                            Comment


                            • #15

                              Re: emission testing

                              I changed the plugs and they all came out with a white chalk on them, the cap and rotor where a different story though. The rotor was so worn that it was noticably shorter than the new one and the termanials in the cap had a lot of build up on them.
                              white chalk..
                              how is the intake gasket.
                              Atomization is excitement, not temperature.

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                              • #16

                                Re: emission testing

                                white chalk is normal on most EFI enigne just means it's running lean. wich is how most factory EFI is programed

                                here is the 200k plugs i pulled out of a 3100 GM v6


                                03 Silverado 2500HD ext. cab short bed 4x4 6.0L: TowMater 92 LeBaron Convertible: Does it run yet?

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                                • #17

                                  Re: emission testing

                                  white chalk is normal on most EFI enigne just means it's running lean. wich is how most factory EFI is programed

                                  here is the 200k plugs i pulled out of a 3100 GM v6

                                  good info..I look for white plugs in my current setup.
                                  i have boxer that won't run tight without this so called "white hot". of course valves are below the plugs sideways..it will be a cleaner world up top of a sideways jug anyway (fake a lean appearance).

                                  the chalk is an oxide that never ends with aluminum. it is actually quite a pig its whole life..contrary to heatsinked belief.

                                  200k, that is looking good...
                                  environment must be spectacular.

                                  today I have 23% humidity in a north wind. I hardly ever see a heavy brown plug anymore.
                                  Atomization is excitement, not temperature.

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                                  • #18

                                    Re: emission testing

                                    not really it's humid most fo the time and the car they came out of looked like it went doen witht eh titanic and brought back up

                                    03 Silverado 2500HD ext. cab short bed 4x4 6.0L: TowMater 92 LeBaron Convertible: Does it run yet?

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                                    • #19

                                      Re: emission testing

                                      high CO is fixed by an 02 sensor .CAT /tune up will take care of HC

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                                      • #20

                                        Re: emission testing

                                        It looks like I'm going to have to put a converter on it.
                                        I changed the plugs, cap, rotor, air filter, oil, and added some alcohol that I had and now it's 5.48 on HC, 6.40 on CO, and 1.90 on NOx.
                                        It was a little better, but on the HC.....The one I'm trying to get down, now it's worse!
                                        also boost will make the cam act smaller

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