Re: Fiat Stilo, 51 reg, 1600 16v failed MOT emissions on CO Archived Message
Posted by Michael Whitworth on December 12, 2007, 8:15 pm, in reply to "Re: Fiat Stilo, 51 reg, 1600 16v failed MOT emissions on CO"
>>>>I have now compared the front and rear O2 sensor patterns on Solus and at fast idle they are both textbook switching 0.1 to 0.8v and virtually identical -<<<< Deffinately Cat not doing much but why? >>>>reading at the front of cat 123 degC and rear was 166 degC difference of 43degC<<< For the temp to increase, some sort of catylitic reaction must be taking place, >>>>Normal idle STFT +19%, LTFT +40% Fast Idle STFT -0.7% to +20%, LTFT +56%<<<< These fuel trim figures do not make sense to me, are they correct? What tool are you using? >>>Fast Idle CO 0.487 HC 1 CO2 14.73 O2 0.06 Lambda 0.989<<<< As a rule I find if just a cat fault lambda is generally slightly high. These gas readings suggest the engine is running slightly rich ie no oxygen but nearly 0.5 % CO? Just my observations. Mike
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