aracer

As tested with KTS 300/PST 2- we have two issues that, MAYBE, OTHERS have had to deal with too?
engine performs lethargically-code is "closed loop system limit"
Second involves the diff wheel locking light on dash-tester showed L/F wheel sensor fault-although when testing it, it showed that it was signaling, changed it with no change in results-ANY SUGGESTIONS ON THESE TWO "FAILURES' APPRECIATED-go you sharksters-thanks Mark

John Speake

1st problem is saying that the O2 loop has reached the end of it's +/- 20% adjustment range trying to keep the A/F ratio at stoich.

This could be a problem with MAF aged (any more than 80k miles, this is a suspect). I assume you have checked inlet vacuum, in case of an air leak ?

O2 sensor itself is of course a possibility.