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               Originally Posted by 
              bonjo  
              I take it this is at normal running temperatures.
              I expected the mixture to be the same once up to temp irrespective of ambient; but maybe this is common practice unless again it goes back to not having the O2.
 Don't know if 2% is significant enough to make a noticeable change.
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         The 01 ECU does not have an O2 sensor Only ECU's 10 & 11 have O2 sensors.
         
        
 A well written fuel map should have the same A/F ratio once the engine is at operating temp, the 01 ECU mapping does seem to change with ambient air temp with the motor at operating temperature. The 2% does not really make much difference, it was just really an observation.