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Discussion Starter · #1 · (Edited)
My car runs like a beast..I have a a steady 760 - 800 o2 reading at WOT in third gear, but shortly after going into 4th gear the scanmaster changes from 760 straight to 030-045(around that+-) in a blink. Car still gaining speed hard and running strong but I lost my reading??? I have a a tad of knock between shifts but nothing during the acceleration. Pushing about 28lbs of boost at top of third and fourth gear. Any clues out there :dunno:
 

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If you aren't getting knock at WOT in 4th gear at 28 lbs of boost I am wondering if your readings of 0.760 - 0.800 (in 3rd) got rich (in OD) and went to 1.030 - 1.045? I don't have a scanmaster, I have a different scan tool but maybe the scanmaster is only capable of showing the last 3 digits? :dunno:

If you were getting o2 readings of 0.030 - 0.045 in 4th gear at 28lbs of boost I would expect a loud boom and some broken parts, a blown headgasket at the very least.

Good luck,
 
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