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Thread: Issues with my truck

  1. #1
    Junior Member
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    Default Issues with my truck

    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 have DTC's:
    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.avent set up my PID tables yet or doen 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.

  2. #2
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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.

  3. #3
    Joe (Moderator) joecar's Avatar
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    Sounds plausible, those DTC's even make sense now... lean on one bank is usually an exhaust leak.

  4. #4
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    Well I checked for exhaust leaks. Didnt find any major ones. Tightened everything up and still no luck solving the issues. I took the truck to the Local Dyno Shop. A buddy owns the place and I told him to find the problem, fix it and then do a complete WB tune on the truck and call me when he gets done.

    I dont have time to mess with it.

  5. #5
    EFILive Reseller wait4me's Avatar
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    There might be water in the pcm connections. Sometimes when people put in there pcms if they get a tuned one, forget or dont put in the orange seals in correctly, so water gets in and then causes weird issues until the water dries.
    "If you can leave a black mark on the pavement, from the exit of one corner to the braking point of the next one, you have enough horsepower."

  6. #6
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    I am sure Jessie an dhis guys will figure it out. They do alot of the LS1 performance stuff localy. They know thier stuff. I would have done it but have been working 7 days a week and just got stuck on 3rd shift so my schedule is all screwed up.

  7. #7
    Joe (Moderator) joecar's Avatar
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    Let us know what it turns out to be.

  8. #8
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    Will do

  9. #9
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    upadte. Found a dead injector on the #7 cyclinder. Ordered a new injector and tunning will start soon.

  10. #10

    Default

    So did the new injector fix it?

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