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Thread: MAP sensor oscillation at key on. Seemingly high value when idling/running. VIDEO

  1. #1
    Potential Tuner
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    May 2018
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    MAP sensor oscillation at key on. Seemingly high value when idling/running. VIDEO

    This is after trying 2 different MAP sensors (ZR1 3 bar), checking the wiring to the sensor, replacing the wiring from the ECU to the sensor, and even tried 2 different ECU's (Both P59's with 3 bar SD OS).

    Anyone have any idea what this could be??

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  2. #2
    Potential Tuner
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    May 2018
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    You can also turn the key off and it does the same oscillation for another 20-30 seconds.

  3. #3
    Tuning Addict 5FDP's Avatar
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    Random question, how many MAP channels are you logging?

    Just the 3 bar channel or several map channels?

    Does removing the channel, then re-polling for supported parameters, then adding the channel back in help any?
    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.

  4. #4
    Potential Tuner
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    Fairly certain I'm only logging the one MAP channel.

    Haven't tried removing the channel.

  5. #5
    Tuner in Training
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    I had the exact same thing when I had a 1Bar map and 2Bar map graphing.