Poor CL behavior, WOT = OK, help ???

Discussion in 'SN95 4.6L Mustang Tech' started by DonMaximo, Nov 5, 2009.

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  1. DonMaximo Member

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    Problem Solved

    8+ months back I replaced the stock TB and upper plenum with a combination from C&L. Pretty much a plug and play "WITHOUT" resetting KAM by disconnecting the battery.

    I just reinstalled the original TB/plenum, flushed the KAM, built the KAM and now the car is working properly again. Very refreshing to say the lease.

    I can only suspect that over time the KAM settings being captured by the PCM and C&L combo may have resulted in bad data for the PCM. I don't feel particularly confident about this hypothesis yet as I would have expected the PCM to adapt to this slight improvement in air flow and take LAMBSEs & HEGO into consideration when calculating injector pulse width.

    I ordered an SCT flash device yesterday. Once I come up to speed on it's functionality, I'll reinstall the C&L setup and will tune accordingly.

    MANY MANY thanks again to all who participated in this thread. Without this forum, this problem resolution would have taken much longer

    Sincerely,

    Darryl
    DonMaximo, Nov 6, 2009
    #21

  2. oxfordgt Member

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    That is in no way how the ECU works. After 3 run cycles the ECU would have relearned the settings after changes.

    What all did you swap (TB, Plenum, IAC, TPS,)?
    oxfordgt, Nov 6, 2009
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  3. DonMaximo Member

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    Only the TB & Upper plenum were replaced 8 months back.

    When the problem originally began to surface, I replaced plugs, COPs, and cleaned the air filter, MAF meter, and TB. Then I replaced the TPS. None of these relatively cheap solutions fixed the problem.

    Then I purged the KAM...and the problem was more pronounced.

    It's that simple...

    Then I reinstalled the original TB & plunum, took the car for a 15 minute drive around town and it's like new again.

    As for rebuilding KAM, how do you define a cycle ?
    DonMaximo, Nov 7, 2009
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  4. oxfordgt Member

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    oxfordgt, Nov 7, 2009
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  5. GDawg Founding Member

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    Never test with anything but a DMM (Digital Multi-Meter). Don't use an Analog. You were probably getting 0.30vAC and just reading it wrong. 0.30vAC is okay. Anything higher than 0.40vAC is too high. Hence, if it was 30vAC you are looking at major computer screw ups...!
    GDawg, Nov 8, 2009
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  6. DonMaximo Member

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    Gotcha... now I understand what you're getting at and why we had a disconnect.

    This link is specific to the Onboard Diagnostic behavior and this does make sense.

    What I was referring to is Adaptive Learning that is typically used by an ECU/EEC/PCM computers to capture information over a period of time which is specific to how the fuel injection components work together. This is why I stuffed buzz words like LAMBSE, HEGO, etc into my message. These are specific to the fuel injection system... not OBD.

    As a reminder, my engine never kicked the MIL.

    Many thanks again for the link and clarification.

    DonMaximo, Nov 9, 2009
    #26
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