I am gonna try the rears tonight. Thanks iamkeniff

I also might swap with the Denali's sensor and see if they make a difference.

 

I had this same issue. A new set of O2s fixed it. However, I believe I did swap my rears to the front and had the same problem due to miles. You need NEW, FACTORY sensors (ACDELCO) Not the Bosch bullshit some people will try and sell you on ebay.

Also I understand it is probably hard to find a tuner in Guam but ultimately the truck needs to get to a dyno and run with a live tuner. Theres **** that can be done/noticed in person that might be going on versus over email or any of that other stuff. Trust me on this one, I did it for months on my '00, its worth it.

 

Dyno on the island...none existent. I think they would make a killing here. but no one has one. Wheatley is a very patient man and a damn good tuner. I would have him dyno tune this in a heartbeat.

I swapped the sensors. Tightened all the header bolts more than what they probably should have. Did a log at idle. both sensors are not in sync with each other. bank one has rigid peaks and valleys. bank two is long hills and shallow valleys.

I have attached an HPT idle run log in case anyone wants to look at it.

If I need to, I will buy the corvette rears, they are cheaper than the truck sensors Truck ones are ac delco, the corvettes are denso.

 

i never paid attention to the way my sensors are. all i know is my bank 1 sensor 1 isnt tripping out anymore. did your o2 code come back on after swapping o2s

 

The code 1154 and 1134 only tripped after I had been driving for a while (20-30 minutes) between normal cruise and WOT. It surges occasionally around 170 temp but goes away either by revving it up or once it reached normal temp.

I only had a chance to log an Idle run last night. Today I will see what she does on the road. If interested, I can submit a log of that as well.

 

i cant help you bc i dunno what im looking at lmao!

 

So I swapped them last night. Today I got to drive it to work... It ran worse then ever. So a new set of o2's will be ordered.

 

damn. i put LTs on my truck at 1800 miles it never had time to "wear out"

 

Will Speed density work until I get my new o2's? I set the MAF to 0 and did a run log. LTFT on bank 2 were around +25 area...then stayed there until I opened up the throttle. Now they stay at +13 on bank 2 and -13 ish on bank one.

I thought SD mode would take the o2's out of the equation? Could my fuel trims be out of whack again?

 

I had the same issue with my 02 sensors and i ordered some Denso 02's offline for i think $70 shipped and they work like a champ. I can dig up the part number and the site i got them from and pm with it if you want.

Hope that helps.