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Thread: LS6 944 Misfire

  1. #11
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    That’s not what I’m asking. You are running the engine off the MAF only, why? Have you tuned the new MAF cure 100% since that’s what’s controlling the fuel. Misfires can come from many things and a bad mixture is one of them.

  2. #12
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    Quote Originally Posted by Team208Motorsports View Post
    That’s not what I’m asking. You are running the engine off the MAF only, why? Have you tuned the new MAF cure 100% since that’s what’s controlling the fuel. Misfires can come from many things and a bad mixture is one of them.
    I see. I was not aware I was running MAF only, that was not my intention.

    I just checked my tune and found B0120 set to 400. I think I did not set B0120 back to 4000 after my last Calc Vet.
    Last edited by pormgb; July 16th, 2018 at 01:58 PM.

  3. #13
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    Is the engine a stock ls6? Is the maf a later cartridge maf or truck maf?

  4. #14
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    Quote Originally Posted by Team208Motorsports View Post
    Is the engine a stock ls6? Is the maf a later cartridge maf or truck maf?

    Specs;
    Stock LS6 Intake
    226,229 578,585 Cam
    LS6 Heads with Manley Valves
    Professional Products 85mm TB
    Delphi LS6 MAF
    SVO 40lb Injectors

    I set B0120 back to 4000.

  5. #15
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    And you VE tuned then maf blend or maf tune and ve blend?

  6. #16
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    Quote Originally Posted by Team208Motorsports View Post
    And you VE tuned then maf blend or maf tune and ve blend?
    I used the results of Calc Vet and blended both MAF and VE tables. I use a WBOS for the AFR reference.

    My old VE table is probably right. Calc Vet produced it. I never saw the benefits of the corrected table because it was never used (B0120).

  7. #17
    Joe (Moderator) joecar's Avatar
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    Ah, good observation by Team208...

    is your MAF corrected...?

    looking at your log LS1B_133, it seems to me that MAF looks like it is under-reporting (i.e. MAF table needs to go up in some places).

  8. #18
    Joe (Moderator) joecar's Avatar
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    Something else: if this is a transplant, then te MAF ducting will be different than the donor car... post pic of engine bay showing MAF ducting... any bends too close to the MAF will not be able to be tuned out.



    ( also: after MAF is corrected, you will want to correct VE table )

  9. #19
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    Quote Originally Posted by joecar View Post
    Ah, good observation by Team208...

    is your MAF corrected...?

    looking at your log LS1B_133, it seems to me that MAF looks like it is under-reporting (i.e. MAF table needs to go up in some places).
    Yes, the MAF was corrected via my last Calv Vet.

    Do you recommend running another Calc Vet or can I manually raise some of the MAF table areas?

  10. #20
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    Quote Originally Posted by joecar View Post
    Something else: if this is a transplant, then te MAF ducting will be different than the donor car... post pic of engine bay showing MAF ducting... any bends too close to the MAF will not be able to be tuned out.



    ( also: after MAF is corrected, you will want to correct VE table )
    MAF Plumbing.

    Click image for larger version. 

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