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Thread: question about MAP and Spark

  1. #1
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    question about MAP and Spark

    I have a really basic question. Trying to understand what the car is doing doing during these these drops in MAP & Spark(See Attachment). Trying to learn but there does not seem to be a lot of good content on how to read the scans. Any suggestions for learning would be great!
    Attached Images Attached Images

  2. #2
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    Bill@HPTuners's Avatar
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    my guess would be DFCO or AFM
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  3. #3
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    Quote Originally Posted by Bill@HPTuners View Post
    my guess would be DFCO or AFM
    I have disabled DOD already.

  4. #4
    Tuning Addict 5FDP's Avatar
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    Could you post the log here?
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  5. #5
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    Logs

    08072020WOT.hplKuperTuneCamaroSSL99_1.1.hpt

    Attached logs and current tune with DOD delete and CAT delete.

  6. #6
    Tuning Addict 5FDP's Avatar
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    I think I agree with Bill, looks like decel fuel cut-off being enabled when you coast for a few seconds. It shuts off fuel and timing goes way down.

    You also forget to disable the cat test in the engine diag's exhaust tab and forgot to disable COT in the tune. You should also go through the DTC's list and disable all the rear o2 sensor codes because you may get some of those with the cats removed.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  7. #7
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    thanks for the suggestions! THE COT is pretty straight forward. I have been reading on DFCO looks like about 50/50 in terms of disabling. Looks like there are several ways of disabling also. Some people mention likeing the poping/crackling noise it causes but i have not noticed that. Any advice on how to disable and pros/cons?
    Last edited by rkuper82; 08-11-2020 at 02:23 PM.