Date: Wed, 26 Feb 2003 14:18:27 -0500 From: "darkpoter" <darkpoternospamail.com> Subject: Re: emissions problems Re: Help
The best way to drop you NOx (parts per million) is to drive it for a good 20 minutes.. get it warm.. but not so warm that the fan comes on. When teh fan is on it actually runs a bit richer. I left my car running outside while waiting for the test. use Ethanol as Walt has suggested. Check/replace your air and fuel filters too. By doing these two things my car went from 1589ppm to 789 ppm Matt "R Ellefson" <ellefson3nospami.com> wrote in message news:3E5C1364.9DF39B37nospami.com... > high speed 1921 rpm 25 > mph low speed 1682 rpm 15 mph > HC(ppm) 77ppm hign speed (168 std) pass > 155 low speed (173 std) pass > CO% 0.60 (std 1.08) > pass .40 ( std 0.98) pass > CO2% > 14.6 > 14.8 > O2% > 0.4 > 0.5 > NOx(ppm) 1269 (1208 std) > fail 2368 (1323 std) fail > Dilution 15.1 (>6.0 std) > pass 15 (> 6.0 std) pass > > Does this help any ? I'm still confussed what can I do to correct this > problem. I should also add that the > ambieant air temp was between 20 - 30 F and the operator had to put the > sniffer wand end into a electric space heater grill to get the machine to > calibrate. The machine wouldnot calibrate until he did this he tried 3 times > before doing this to get the machine to calibrate. Would the difference in the > actual air temp and the calibrated temp give different # based on air density. > ie colder higher emissions readings? Also colder engine higher readings? > > Walt Kienzle wrote: > > > Maybe my memory fails me, but I thought that high NOX readings were either > > from a lean fuel mixture (too much nitrogen rich air) and/or excessively > > high combustion temperatures. The EGR valve is designed to route some > > exhaust gas back to the intake to reduce the combustion temperatures and NOX > > emissions. > > > > Most likely the thermostat is stuck open or partially open and this will > > cause poor gas mileage, but the emissions issue might be a different > > problem. Does your emissions test also measure HC (Hydrocarbons)? That > > would be the high reading if the fuel mixture was too rich. > > > > Walt Kienzle > > 1991 9000T > > > > "R Ellefson" <ellefson3nospami.com> wrote in message > > news:3E5B92C3.8CB36D10nospami.com... > > > I have a 88 16v non turbo, it failed the NOX emissions test. I have > > > noticed the it is using excessive gas in colder weather, I also noticed > > > that when the emissions test was being run it smelled almost as if the > > > car was running rich. I notice that the temp gage never gets to the > > > middle but stayes in the lower third of the gage. Could my problem be > > > excessive richness causeing both the emission problem as well as the gas > > > consumption increase in cold weather, and could this richness be caused > > > by a thermostat and or fan temp switch which are to low for cold > > > weather? > > > > > > Thanks > > > Ron > > > >
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