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Thread: Just finished my COS tune and no start

  1. #21
    Joe (Moderator) joecar's Avatar
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    EFILive tunetool is quirky when it comes to correcting OOR cells, exactly what cv8r said above.

    More info:

  2. #22
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    Thanks for the info!

  3. #23

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    is it running now
    330 rwkw EFILIVE OS 01290005 SD Cam / Head Tuned 6 speed VY SS Commodore
    10/71 Blown 572 Big Block Chev HQ 2 Door Monaro

    GM Performance Centre
    Busselton WA
    AUSTRALIA
    Phone: 0447 003050

  4. #24
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    Default Just finished my COS tune and no start

    I just tried it yesterday. It started right up but then stalled out. It then keep saying reduce power. And would only run for a second or two after then stall. Any ideas?

  5. #25
    Joe (Moderator) joecar's Avatar
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    How did you populate the tables in the COS...?

    i.e. did you do either of these:
    - full flash the empty COS file and then cal flash from the corresponding GM base file...?
    - full flash an already populated COS file...?

  6. #26
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    Default Just finished my COS tune and no start

    I did a full flash of the cos then a cal flash of the stock tune I got from the truck.

    Since it last ran it has gotten injectors and a cam and the twin turbo setup. I'm also maf less with a gm iat sensor if that helps.

  7. #27
    Joe (Moderator) joecar's Avatar
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    Did you correct the IFR...?

    Are you getting a MAF DTC (without this it is going to do its best to use the MAF)...?

  8. #28
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    Yes I adjusted the IFR to the proper units.

    I dont remember if I am getting a MAF DTC or not. I know for C6001 I have P0101-P0103 set to Non emissions.
    In C2901 I have the MAF frequency set to 1 and also for C2903 so it should be setting a code right?

    Thanks

    Current tune loaded: Riebel cos3 0001.tun

  9. #29
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    These are the DTCs I am getting.

    P0315: Crank position variation not learned
    P1514: Map/Maf Throttle position correlation
    P0102: Maf Circuit low
    C0327: Encoder Circuit

    I also did notice my 2 bar map sensor was reading 15psi with the key on engine off is that a concern? Do I need to change that?

    Here is the data log of this tune starting and stalling right away. Cos3 run 4-3 start n stall.efi

  10. #30
    Joe (Moderator) joecar's Avatar
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    P0102 is sufficient to fail the MAF (so the PCM then uses VE exclusively).

    P1514 indicates that the throttle/airflow sanity tables are being exceeded (see the Engine Diagnostics folder of your tune file).

    KOEO MAP should read barometric pressure, 15 psi (101 kPa) is correct at sea level.

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