From: Rastamon on 25 Aug 2009 21:25 I changed the oil and air filter, and it passed. Though I'm curious why the NO went up almost to the max. State Emission Standards: 15 MPH - HC (PPM): 146 Max / 43 Ave CO(%): 1.04 Max / 0.16 Ave NO (PPM): 1136 Max / 406 Ave 25 MPH - HC (PPM): 118 Max / 32 Ave CO(%): 1.32 Max / 0.15 Ave NO (PPM): 1222 Max / 349 Ave Here are the results before and after: BEFORE: 15 MPH - HC (PPM): 72 CO(%): 1.20 NO (PPM): 259 25 MPH - HC (PPM): 78 CO(%): 1.24 NO (PPM): 285 AFTER: 15 MPH - HC (PPM): 87 CO(%): 0.38 NO (PPM): 1130 <--- 4 times than before 25 MPH - HC (PPM): 51 CO(%): 0.14 NO (PPM): 1102 <--- 4 times than before It was about a quart low on oil, so a blow-by might have contributed to the failure on the first test.
From: al on 26 Aug 2009 18:37 On Aug 25, 9:25 pm, "Rastamon" <ra...(a)dakine.com.invalid> wrote: > I changed the oil and air filter, and it passed. Though I'm curious why the > NO went up almost to the max. > > State Emission Standards: > > 15 MPH - HC (PPM): 146 Max / 43 Ave CO(%): 1.04 Max / 0.16 Ave NO > (PPM): 1136 Max / 406 Ave > 25 MPH - HC (PPM): 118 Max / 32 Ave CO(%): 1.32 Max / 0.15 Ave NO > (PPM): 1222 Max / 349 Ave > > Here are the results before and after: > > BEFORE: > 15 MPH - HC (PPM): 72 CO(%): 1.20 NO (PPM): 259 > 25 MPH - HC (PPM): 78 CO(%): 1.24 NO (PPM): 285 > > AFTER: > 15 MPH - HC (PPM): 87 CO(%): 0.38 NO (PPM): 1130 <--- 4 times than > before > 25 MPH - HC (PPM): 51 CO(%): 0.14 NO (PPM): 1102 <--- 4 times than > before > > It was about a quart low on oil, so a blow-by might have contributed to the > failure on the first test. The air filter must have been filthy causing a rich mixture and high CO. High NO means the EGR system is not functioning correctly. Good luck. Al
From: clare on 26 Aug 2009 21:13 On Wed, 26 Aug 2009 15:37:53 -0700 (PDT), al <abuonag(a)msn.com> wrote: >On Aug 25, 9:25 pm, "Rastamon" <ra...(a)dakine.com.invalid> wrote: >> I changed the oil and air filter, and it passed. Though I'm curious why the >> NO went up almost to the max. >> >> State Emission Standards: >> >> 15 MPH - HC (PPM): 146 Max / 43 Ave CO(%): 1.04 Max / 0.16 Ave NO >> (PPM): 1136 Max / 406 Ave >> 25 MPH - HC (PPM): 118 Max / 32 Ave CO(%): 1.32 Max / 0.15 Ave NO >> (PPM): 1222 Max / 349 Ave >> >> Here are the results before and after: >> >> BEFORE: >> 15 MPH - HC (PPM): 72 CO(%): 1.20 NO (PPM): 259 >> 25 MPH - HC (PPM): 78 CO(%): 1.24 NO (PPM): 285 >> >> AFTER: >> 15 MPH - HC (PPM): 87 CO(%): 0.38 NO (PPM): 1130 <--- 4 times than >> before >> 25 MPH - HC (PPM): 51 CO(%): 0.14 NO (PPM): 1102 <--- 4 times than >> before >> >> It was about a quart low on oil, so a blow-by might have contributed to the >> failure on the first test. > >The air filter must have been filthy causing a rich mixture and high >CO. High NO means the EGR system is not functioning correctly. Good >luck. Al More likely the oil was diluted with gasoline and/or breaking down. Half the vehicles that have a marginal fail would pass if the owner was smart enough to change the oil before taking it in. Nox can fail one day and pass the next if temperatures change (drop) 5 degrees or so. Can pass one day and fail the next if temps go up. The testing station is supposed to run a big fan pointed at the car when it's hot out. Failure to do so can cause a lot of false fails.
From: Rastamon on 27 Aug 2009 05:19 <clare(a)snyder.on.ca> wrote in message news:g7nb95hkhtnvcav6a5fa8bt5c1bfr15tdv(a)4ax.com... > On Wed, 26 Aug 2009 15:37:53 -0700 (PDT), al <abuonag(a)msn.com> wrote: > >>On Aug 25, 9:25 pm, "Rastamon" <ra...(a)dakine.com.invalid> wrote: >>> I changed the oil and air filter, and it passed. Though I'm curious why >>> the >>> NO went up almost to the max. >>> >>> State Emission Standards: >>> >>> 15 MPH - HC (PPM): 146 Max / 43 Ave CO(%): 1.04 Max / 0.16 Ave NO >>> (PPM): 1136 Max / 406 Ave >>> 25 MPH - HC (PPM): 118 Max / 32 Ave CO(%): 1.32 Max / 0.15 Ave NO >>> (PPM): 1222 Max / 349 Ave >>> >>> Here are the results before and after: >>> >>> BEFORE: >>> 15 MPH - HC (PPM): 72 CO(%): 1.20 NO (PPM): 259 >>> 25 MPH - HC (PPM): 78 CO(%): 1.24 NO (PPM): 285 >>> >>> AFTER: >>> 15 MPH - HC (PPM): 87 CO(%): 0.38 NO (PPM): 1130 <--- 4 times than >>> before >>> 25 MPH - HC (PPM): 51 CO(%): 0.14 NO (PPM): 1102 <--- 4 times than >>> before >>> >>> It was about a quart low on oil, so a blow-by might have contributed to >>> the >>> failure on the first test. >> >>The air filter must have been filthy causing a rich mixture and high >>CO. High NO means the EGR system is not functioning correctly. Good >>luck. Al > More likely the oil was diluted with gasoline and/or breaking down. > Half the vehicles that have a marginal fail would pass if the owner > was smart enough to change the oil before taking it in. > > Nox can fail one day and pass the next if temperatures change (drop) 5 > degrees or so. > Can pass one day and fail the next if temps go up. > The testing station is supposed to run a big fan pointed at the car > when it's hot out. Failure to do so can cause a lot of false fails. It was cool the day I ran the first test, about mid 80s. Then I got an oil change and a week later, it was more than 90F and there was a fire near by. Like I said, I don't use this truck much unless I have a HomeDepot run. One guy told me a lot of RV motorhomes fail because they still for long periods and don't get oil changes. I guess I'll change the oil, more often, even though it's not that dark.
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