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Thread: So my GenIV went from running good to not want to idle, i'm stumped

  1. #1
    Tuner in Training FourG63 97GST's Avatar
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    So my GenIV went from running good to not want to idle, i'm stumped

    Details 2002 Z06. just did an LS2 swap. it's an 2005 LS2 24x reluctor, 1X cam gear.
    initial first start up

    https://www.youtube.com/watch?v=JohoUaQ-d0w

    warm start, car has an SD tune. Maf there for the IAT

    https://www.youtube.com/watch?v=B6VOvKNYoFw

    wired in IAT sensor, bleed cooling system, everything still cool.

    https://www.youtube.com/watch?v=CoNCkMWjz0s

    another hot start. At this point, I noticed the CEL P0101-P0103 which is MAF that i just removed to wire in IAT, DTC P0343 popped up, Camshaft Position (CMP) sensor Circuit High voltage, car still starts and runs at this point. I start looking around for info on the DTC, appeared the code is generally GenIV motor with GenIII pcm related, Cam bolts backing out, or cam sensors wires need to be switched. Engine has new front cover, new cam, New roll master 1x timing set, new crank sensor, lock tight cam bolts. so unlikely with bolt backing out issue. top end has like 25mins of run time on it.
    found this schematic on cam sensor. I do have 12v going to the sensor. dunno what happening after that yet.


    Still running at this point
    https://www.youtube.com/watch?v=3oJ3C9JR8kk

    go to bed and it just won't start run anymore. when it does, it's for a few second, then it dies. I started focusing on that code. I switched the A and C cam sensor wires, the code did go away, but it still wont run. I switch the wires back and the code back. now I'm uncertain how relevant is that code to my diagnosing.
    https://www.youtube.com/watch?v=tLfz5uLzUP4

    and I do have fuel pressure, 58psi on my mechanical gauge....I need ideas on where to look, can the cam sensor be logged somehow? i haven't found that channel

    the logs attached is from it running bleeding the cooling system going through its heat cycle
    then cranking with wire switch
    then switched back
    Attached Files Attached Files

    - 02 Z06, LS2, Twin Turbo

  2. #2
    Tuning Addict 5FDP's Avatar
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    MAF dtc's need to be on MIL on first error for speed density only. That could cause it to not want to fail and go into speed density and keep running.

    Out of curiosity what MAP sensor is that and how do you expect it to run with a VE table that is extremely high at everywhere down low. The one log warmed up and in closed loop showed a massive exhaust leak or vacuum leak as the LTFT was pegged at +25. Change cylinder volume to match the 6.0 engine size too.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuner in Training FourG63 97GST's Avatar
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    I got it, during trying things, I happened to try a map from 2 days ago before I took of the MAF, and it ran. the MAF error was the common denominator. got it running again, thanks.
    The car is mid assembly on stands with a tune from my 5.7, vacuum lines and exhaust not sorted yet. it's a 3.3bar if I remember currently. it's going to be retuned. just sorting out bugs while i button it up.

    - 02 Z06, LS2, Twin Turbo