Quote:
Originally Posted by jfoj
By comparison, below is the graph of the Pre-cat O2 sensors for greggo151.
Note the this may not have been from 100% cold start and this graph has more than idle and for a longer period of time.
But I did not have enough solid data and I do not think the O2 sensors on greggo151 vehicle are the primary problem.
It is clear the fuel management system is not working and the O2 sensors are seeing a pretty Lean condition consistently. But more data would have allowed a better view of what is really going on.
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Since greggo151 cleared the trouble code, he in essence also reset the long term fuel trim. The values for the LTFT can not be consider a good indication of the health of the fuel system and engine. He had a vacuum leak so that was the cause of the lean condition. He should post a new scan of the engine now that he corrected some of the problems.