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Thread: VATS issue - 3800 L27 to L67 - $5B4 $5B5

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  1. #1
    Electronic Ignition!
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    VATS issue - 3800 L27 to L67 - $5B4 $5B5

    Hi all, working with a 1992 Pontiac Bonne - was originally an L27 NA car, has been converted to the L67 Supercharged engine.

    L27 uses a 16141470 PCM with $5B4
    L67 uses a 16141470 PCM with $5B4

    The vehicle starts and runs with L27 Prom AXAZ - Tech1 says VATS YES

    I have a memcal here from a L67 car - BCFN - swapped it over and says Tech1 says VATS NO - Cuts out within 2 seconds

    I copied BCFN to the computer and edited it with Tunerpro to unselect VATS.

    Same issue - Cranks, Starts, Stalls immediately - VATS NO

    Strange as the wiring diagrams are identical for the VATS (PassKey) system. I have checked both 1992, 1993 and 1994 wiring diagrams and there are no differences when it comes to the VATS fuel enable signal. Even with VATS enabled in the stock memcal it should have ran!

    As a test I burnt AXAZ on the BCFN memcal and it ran no issues.

    HELP!?

    Thanks all!

    Dan




  2. #2
    Super Moderator
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    so VATS was enabled on the factory L27 calibration as well? but simply switching to the L67 calibration causes a fail?
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  3. #3
    Electronic Ignition!
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    Yes exactly. Doesn't make sense to me

  4. #4
    Electronic Ignition!
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    Any idea's people?

  5. #5
    RIP EagleMark's Avatar
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    Turn off VATS!

    There's probably a high and low VATS frequency in the bin, but since it's not in the mask/xdf you have no way to know where to change it.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  6. #6
    Electronic Ignition!
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    I unchecked VATS on the L67 bin and it STILL failed on VATS . How can I be certain what def to use for the L27 and the L67?

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