hi, need help from you gm techs. i got this s-10 failing california enhanced emissions high nox. 15 mph at 50% load and 25mph at 25% load. im reading @15/50 - 25ppm hc- .03% c0- 14.9 co2- 1908 nox- 02 0. @25/25 -- 1600 nox. spark plugs fair. check the egr valv...

Summary posted 4/11/2005

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