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Thread: 2.5T Pings/Knocks w/87 Octane...please try to hear your engine if you have the same

  1. #16
    Registered Member

    2010 CX-9 GT

    Join Date
    Jan 2011
    Melbourne, FL
    Most modern engines have a knock sensor that the ECU uses to monitor fuel quality - the ECU constantly adjusts the ignition timing and other parameters (boost pressure, etc.) to be right at the threshold of knock.

    It isn't surprising that you started hearing pinging when you switched to 91 from 87 - the engine was running with parameters that the ECU found that worked with 91 octane gas. If it doesn't stop, you either have a problem with the engine, or the gasoline you are using is <87 octane and the ECU can't pull enough timing to fix the issue.

    Personally, I'd stop buying gas from whatever station you bought the "87" octane gas from and try another. I have a Subaru that needs 93 octane gas or it pings like crazy - some gas that is "93" octane works fine while gas from other stations results in mild detonation. It's possible that for whatever reason, your engine is slightly more sensitive to fuel quality than others on here.
    Last edited by jal142; 03-20-2017 at 09:08 PM.

  2. #17
    Registered Member


    Join Date
    Feb 2017
    South Florida
    Can always disconnect the battery for a few hours to reset the ECU.

    Maybe it'll relearn the fuel parameters.

    Still sounds like bad fuel. Put some octane booster in it with 87 or fill up with 91 or higher. I bet it the noise goes away.

    If it doesn't you tell Mazda you've tried everything and the noise persists. Don't leave until it's fixed.

    Ping / Knock is not good. Detonation on a forced induction can do harm after time.

  3. #18
    Registered Member

    2016 Mazda CX9 Signature, 2013 Merc GLK350 4Matic, 2001 S2000

    Join Date
    Aug 2016
    Thanks to all for the replies.....I recently burned off that tank of 87 from Esso and filled up with 87 Shell.... will report later

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