O2's dropping FAST

[Dwayne]

Reading my OTC 4000 after a run........the O2s would start at .50 then drop to 0 in about 4 frames...........I know the car was not lean..........The O2s would cross count during idle and I never got a code 13 (New heated O2).......0 KR through out the run.....................anybody run across this before?

 

[Dwayne]

ttt

 

[JDEstill]

I'm seeing something similar myself. Done some research in the GN mailing list archives, and others have seen this problem as well, but no one gave any real solutions. It would be nice if more people posted the solutions to their problems! Anyway, suggested causes are bad O2 sensor or wiring, bad ground, and lack of fuel. If you've got no knock for an entire run, I guess you can rule out that last one.

John

 

[Dwayne]

While at Bristol we bypassed the stock o2 wiring and ran our own wire from the o2 straight to the ecm......no change

Redid all my grounds 2 weeks ago...still no change..

Used 2 different otc 4000s'..........same ole shhhhhhhhhh

o2 read fine until you hit WOT

 

[TurboDave]

Are you in "road" mode?

 

[Dwayne]

yes