Here goes...

I bought a 2004 Chevy 2500HD 4x4 with a 6.0L and 4L80E combo.

It has some light mods done to the powertrain.

-Full Bassani exhaust from the headers back.
-K&N cold air kit
-Small 210/218 .551/.551 on a 116*
-And a stall of unknow origins. Somewhere around 2800-3000 I would guess.

My Parents drove the truck back from FL a couple weeks ago with out any problems. I have been driving it every since. I got caufght is a huge down pour of a rain storm and splashed aot of water up inot the engin bay of the struck. Every sice the rain strom my truck has had a low rpm low load miss. It just happens upon take off and when the truck kicks down into OD cruising. I have changed the plugs and wires, and it did not help.

I am at a loss for what I need to be looking for or at. Any idea's would be great.

Josh

 

Lots of o2 sensor probs around. Make sure nothing got ruined off the cats.

 

Never thought about that. EFI/LIVE scan shows I have DTC's:
P0135 "02S Heater Performance Bank 1 Sensor 1"

EFI/LIVE systems test reluts show I have one 1 sensor heater bad.

Any idea which sensor that one is, and if replacing it would maybe fix the issues? I am not abpve replacing all 4 of them. That would get pricey though.

 

Try reseting the code first before spending hundred$ on new sensors.

 

Bank 1 sensor 1 is the drivers side, front sensor.

 

I reset the code twice and still havent resloved the issue. This sucks. Not one of the autoparts stores has an OE sensor. Its gonna be mid week if I order one today. Looks like I am off to buy a universal to make work until I can get a new one ordered.

 

Well I am back from the shop. I used a crappy universal cut and splice sensor and it didnt really help. It solved the O2 sensor code but replaced it with:

P0171 "Fuel Trim System Lean Bank 1"

I ordered an OEM replacment sensor so I cna do the plug and play thing. I am alo gonna wire up a WB here soon so I can fine tune the truck in.

I will post up how it turns out for all that are interested.

Thanks for the help guys.

 

WOW For a second there I thought it said 2500HP on a 6L!!

 

My bad meant 2500HD. I wish I had a 2500HP truck.

 

I put in a new OE replacment O2 sensor. Bank 1 is still reading lean. I checked the system test and all is showing good. I guess I will be taking the truck to the local dyno for some tunning. I dont really know what else to look for. I am beginning to think that its been like this since I got it and just noticed it when I start watching the real time data on EFI LIVE.

Question? Do you have to do a free air calibration on OE replacement O2 sensors?