Gelf VXR
November 9th, 2016, 04:57 AM
I put a pair of stock O2 sensors back in after removing the WB LC-1 NB simulated, Ive got to get the headers off and put in extra bungs for the WB sensors. Anyway, i bought couple of cheap sensors of ebay and put them in, but it failed the emissions test at natural idle (they let it go thou).
I logged front and rear O2 from cold start for 12 minutes, just the 4 sensors to get the highest frame rate, whats strange is that both the rear O2 eventually go rich, my understanding was the rear O2's should remain around 450mv confirming the front O2 operation and the CATS are efficient.
Anyone seen this before, is it the cheap O2 sensors ( i got another pair to try out now), air leak in the exhaust causing the rear to drift rich and or dead CATS?
I logged front and rear O2 from cold start for 12 minutes, just the 4 sensors to get the highest frame rate, whats strange is that both the rear O2 eventually go rich, my understanding was the rear O2's should remain around 450mv confirming the front O2 operation and the CATS are efficient.
Anyone seen this before, is it the cheap O2 sensors ( i got another pair to try out now), air leak in the exhaust causing the rear to drift rich and or dead CATS?