Date: Wed, 26 Feb 2003 01:05:32 GMT From: R Ellefson <ellefson3nospami.com> Subject: emissions problems Re: Help
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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