ericjon262

I'm tuning my turbo 3500 swap, and I've noticed something odd... my wideband o2 is bouncing all over, while the narrow band seems to be almost static showing 14.7... it's not throwing a CEL, but it doesn't seem to track with what I was expecting to see. it's also really weird to me that the a/f goes up to 14.7 without ever going down, just up up up up stop @ 14.7 something doesn't seem right, any ideas?

I also think the a/d input on the DHP might not be working, it shows a reletively static voltage, but the gauge shows quite a bit of swing.

I attached the log, and bin file used.I swapped out the sensor, and it acted normal, then after a short amount of runtime, it went back to this...

Thanks for the help.

-Eric

RBob

iTrader: (1)

It appears to me that the A/F column is commanded AFR, not the reported AFR. As such it also appears that this is OK. The ECM does go into closed loop with the short term fuel trim (STFT) adjusting.

I don't see a NB O2 column, or what may be the WB reported data.

RBob.

ericjon262

wow... I'm an idiot... Lol, thanks. I'm having another anomaly now, it's starting to show 0 rpm while the engine is clearly running. I'm thinking the ICM might be failing, or the 7x cranks position sensor, but I'm not 100% sure yet.