I ran these logs on the way to work and back and did 1 or 2 pulls each way. Like I mentioned before I have this problem with the wideband sensor dying on bank 2 and it lasts a month or so because the tune is lean which kills it, but it runs lean cruising only. At WOT both banks stay at 11.25.

Is it normal to have a whole point (1.0) difference in AFR between bank 1 and 2 since bank 2 runs leaner inherently?

I do not get any codes on bank 1 for AFR so there is nothing physically wrong with bank 2 because it would occasionally trigger bank 1. The whole tune is lean. Someone please look at the logs.

This is on G37 Denso injectors.

http://www.filedropper.com/cipher5-16-20133-05-57pm
http://www.filedropper.com/cipher5-16-20136-24-47am

 

In part throttle / cruising both banks should be identical since the ECU does corrections. At WOT you should be around 12.5 with no more than 0.2 - 0.3 diff between banks (assuming n/a). 11.25 means you're bottoming out the reading since that's as low as the OEM sensors can read... probably pig rich. Your tune needs alot of work...

And why are you using VHR injectors on a DE? The latency is probably different and throwing the whole tune off in an unexpected way.. I'm guessing the ECU is giving up on corrections and basically in open loop (limp) mode.

 

I am using VHR injectors because I am also trying to track down a mutiple misfire so I could not find any good Bosch injectors used, even though I replaced everything else to try and fix it, coils, spark plugs, ECM 3 times. Wiring harness is 1 year old.

I figured 11.25 was beyond the readings since it was not changing at all.

and yes this has been running open loop since the swap because bank 2 runs lean cruising and I do not know why. I already did everything possible to find out why. exhaust leak, intake leak, new valve covers...

 

FWIW, O2 sensors wont die if you run lean. So sounds like you have another problem to figure out right there.

 

But the voltage drops from 1.5 volts to 1.1 and under as the logs show and it does not go back to 1.5 which is what they are all at when they are new. Bank 1 has been 1.5 volts since I put the sensor in last year and runs at 13.6 AFR and doesn't drop voltage.

I think the misfire is caused by carbon build up from running rich at WOT, I need to buy Osiris tuner and tune it properly on a dyno. I blew some Dexron III on top of the pistons and let it sit for an hour and ran some Seafoam before. Maybe it will fix it until I can tune it.

It could be caused by the head gaskets and that is no good because I am not digging out the heads to change them bc I have no time. I think the second gen VQ35DE will work with the first gen ECM for another swap, but I need an HR/VHR transmission for it.