RIPjeep2002 Posted January 12, 2012 Share Posted January 12, 2012 Usually at idle and under normal throttle, my UEGO A/F ratio runs between 14.6 and 15.0. The weird thing is lately, if I stop, turn the car off, (say to fill up with gas), and then start the car to drive away, the A/F ratio reads in the low 13's, even while driving, then after a few minutes snaps back to its normal reading. Should I be concerned or is this the beginning of the sensor going bad. Sensor is in a Cobb downpipe, right behind the turbo outlet. Link to comment Share on other sites More sharing options...
XRJoe Posted January 13, 2012 Share Posted January 13, 2012 Sounds normal. You're at stoich when cruising and then upon restart, the ECU runs more fuel as an after-start enrichment. After that time period is over, the ECU is back in closed loop and runs stoich at part-throttle cruise. Link to comment Share on other sites More sharing options...
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