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Thread: need a little help from the experts

  1. #1
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    Default need a little help from the experts

    I ahve most of my tune really working well now and have it running really well. Idle, accel and decel, slow roll, etc. all are really excellent.

    My problem is this - after about 40 minutes on the road it begins to deteriorate and runs choppy.

    Has anyone else encontered this and what did you find?
    2000 Camaro SS Convertible
    M6,
    LTs, AFR 205s, Comp xer 220/224, LS6 intake, Ported TB, AR TT IIs

  2. #2
    EFILive Distributor dfe1's Avatar
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    Are you sure it's time related? It sounds more like a temprerature issue-- perhaps after 40+/- minutes of driving, inlet air or coolant temperature rises enough to cause changes in timing or fuel. I don't know of any timers that would cause a change after the first few minutes of drive time, but there are a lot of temperature-referenced tables. Have you determined whether fuel or spark is getting whacked?
    DigitalEFI- EFILive US Distributor
    sales@digitalefi.com
    678/344-1590

  3. #3
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    You're right, it's not timr but iat and ect are remaining constant. I get the distinct impression that it is running richer, like the 02 sensors are over heating or something but my 02 bung for the wideband needs to be repaired so I can't measure it. It's just strange as I don't see it in fuel trims, or 02 frequency but it definitely gets a distinct roughness, starts to feel "flat".
    2000 Camaro SS Convertible
    M6,
    LTs, AFR 205s, Comp xer 220/224, LS6 intake, Ported TB, AR TT IIs

  4. #4
    EFILive Distributor dfe1's Avatar
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    What about spark timing? Any significant change in it?
    DigitalEFI- EFILive US Distributor
    sales@digitalefi.com
    678/344-1590

  5. #5
    Lifetime Member mr.prick's Avatar
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    IATs over 96*F tend to lean me out.

  6. #6
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    Interestingly, yesterday it drove perfect all the way, main difference:
    Bad Day - IAT 63 at start of run, 64 toward the end
    Good Day - IAT at 59 at start, 43 toward the end
    2000 Camaro SS Convertible
    M6,
    LTs, AFR 205s, Comp xer 220/224, LS6 intake, Ported TB, AR TT IIs

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