Originally Posted by
StevE55
Thanks Josh, that’s a load off.. I ran Lambda test twice today (DAS) and O2’s # 1,2,& 3 were wave cycling in unison but #4 (left – aft.) was almost flat lining until increased RPM’s to 1500 ~ 2000. At the higher R’s, #4 jumped right in w/the rest & cycled perfect… Ever see that B4?
Nope, not familiar with that. Maybe a fluke? DAS makes mistakes sometimes too. It could be a coroded sensor, or a slightly clogged CAT. Have you ran any WOT pulls?