From: rasta@dakine.com.invalid   
      
    wrote in message   
   news:g7nb95hkhtnvcav6a5fa8bt5c1bfr15tdv@4ax.com...   
   > On Wed, 26 Aug 2009 15:37:53 -0700 (PDT), al  wrote:   
   >   
   >>On Aug 25, 9:25 pm, "Rastamon"  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.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)