2004 Chevy 2500HD 4x4 Tune issues.
07-01-2007, 08:27 PM
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2004 Chevy 2500HD 4x4 Tune issues. 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 caught is a huge down pour of a rain storm and splashed aot of water up inot the engine bay of the truck. 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.
EFI/LIVE scan shows I had this DTC:
P0135 "02S Heater Performance Bank 1 Sensor 1"
EFI/LIVE systems test reluts show I have one 1 sensor heater bad.
I put in a new OE replacment O2 sensor. Bank 1 is reading lean. I checked the system test and all is showing good.
DTC:
P0171 "Fuel Trim System Lean Bank 1"
For the sake of argument I swapped the driver front O2 with the passenger front O2 and it is still the same thing. Bank 1 is Lean. I dont understand how Bank 1 is super lean and Bank 2 is only slightly lean. I mean it idles at 21% on Bank 1 and 2.3% on Bank 2.
Something has to give. I havent set up my PID tables yet or done any real tunning on the truck. I just found it odd to be off by so much from the driverside bank or the passenger side bank. I have checked for leaks and everything. I am at a loss.
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 caught is a huge down pour of a rain storm and splashed aot of water up inot the engine bay of the truck. 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.
EFI/LIVE scan shows I had this DTC:
P0135 "02S Heater Performance Bank 1 Sensor 1"
EFI/LIVE systems test reluts show I have one 1 sensor heater bad.
I put in a new OE replacment O2 sensor. Bank 1 is reading lean. I checked the system test and all is showing good.
DTC:
P0171 "Fuel Trim System Lean Bank 1"
For the sake of argument I swapped the driver front O2 with the passenger front O2 and it is still the same thing. Bank 1 is Lean. I dont understand how Bank 1 is super lean and Bank 2 is only slightly lean. I mean it idles at 21% on Bank 1 and 2.3% on Bank 2.
Something has to give. I havent set up my PID tables yet or done any real tunning on the truck. I just found it odd to be off by so much from the driverside bank or the passenger side bank. I have checked for leaks and everything. I am at a loss.
07-01-2007, 09:48 PM
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Okay I got to messing with the truck some more. I may have an exhaust leak where the header meats the transistion pipe to the Hi Flow CAT. It is tight but I think it is out of alingment. I bounced the truck through a decent size ditch a few days ago. That is about the time this all started. I got under the truck earler and there is an audible ticking comimg from the area of the header to transistion pipe ball and socket flange. I am gonna drive the wifes Tahoe to work tonight and work on the truck in the morning.
