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

  1. #1
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    2.5T Pings/Knocks w/87 Octane...please try to hear your engine if you have the same

    A while back I posted on here that I was hearing a ticking sound, during acceleration, under boost around 2500-3500rpms. When in Park, if I was to rev the engine up to those rpms, there was no ticking noise.

    I took it to the dealer at 3000kms on the odometer and left it with them overnight and a day. They replicated the noise and said that it is a common noise on engines that have a valve/flap that regulates the intake pressure. In the 2.5T's case, the dealer is saying the intake manifold (dynamic pressure system). They had no fix, and said it was normal....also commonly heard on the MS6 engine from what they say.

    So ever since then I decided to switch over to no lower than 91 octane fuel for the added hp bump (which is very noticeable above 5000rpms btw)....to my ears, the ticking noise went away after 3 or 4 tanks using 91 Octane.



    ....NOW, I'm at 11,000kms.... I just recently filled up with 87 octane after the tank was empty. Low and behold, the ticking noise is back.......

    my 2.5T pings or knocks!.... this is surprising since 87 is the minimum recommended fuel.


    I am asking my fellow owners if you hear the same ping/knock noise from the engine with 87 Octane. Do the following:
    -Radio off
    -HVAC off
    -find a quiet location
    -windows up
    -from a stop accelerate fairly aggressively up to 2500rpms and holding the boost/rpms around 3000rpms

    I hear the noise coming in front of the passenger side engine bay when driving.

    I need to know if this is an isolated case with my vehicle, or is this something common.

    Thanks All!

  2. #2
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    No such noise from mine. Have you tried different brands of gasoline, all labeled 87 AKI? That makes a difference.

    You might check pages 5 & 6 of this Chevron Motor Gasoline Technical Review for some interesting information about engines and gasoline:
    http://www.chevronwithtechron.ca/pro...ech_Review.pdf

  3. #3
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    I run 87 all the time, and have not heard this, but I will check this afternoon.

  4. #4
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    I've only used 87 octane and have never heard any knocking.


    Sent from my iPhone using Tapatalk

  5. #5
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    87 octane and no such noise. having said that, i have never let the gas go down to empty.

  6. #6
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    Tried to duplicate your situation today, no pings. 87 octane, warm engine, 7 degrees Celsius today.


    Sent from my iPhone using Tapatalk

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    Haven't noticed any issues with mine though I've only had my vehicle for over 2 months so might be too early to tell...also I recently switched to using premium gas and while it is not required I don't mind paying the extra cost since we only put in low mileage on it and the extra $20 per month won't break the bank

  8. #8
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    Quote Originally Posted by tekbis View Post
    Haven't noticed any issues with mine though I've only had my vehicle for over 2 months so might be too early to tell...also I recently switched to using premium gas and while it is not required I don't mind paying the extra cost since we only put in low mileage on it and the extra $20 per month won't break the bank
    But there is no point in doing so. If you actually use the added horsepower at max rpm, OK. Otherwise, spend your money more wisely.

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    Quote Originally Posted by PTguy View Post
    But there is no point in doing so. If you actually use the added horsepower at max rpm, OK. Otherwise, spend your money more wisely.
    I have always used Shell V Power even with my previous Volvo...i know it is not necessary but I don't mind using prem gas not only for the added hp but also for the added benefits such as having cleaner engine deposits and the additives to help protect against gunk and corrosion and etc. We can debate this but at end of day it's my money and I can spend as I wish...besides it's only $20 more per month for me and this is a $50K vehicle so the extra cost is not as significant

  10. #10
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    OP, it is hard for others to replicate the exact test, also each individual has different sensitivity to noise. Can you try with 87 octane from a different brand or a busier location? If problem remains, try test drive on a dealer vehicle.

    Sent from my SAMSUNG-SM-N910A using Tapatalk

  11. #11
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    Maybe I'm out of place and need to stick to my own generation of cx-9 threads, but is this a Ford motor? My work vehicle which is a Ford Escape 1.6T ecoboost has always pinged a little. Even my CX-9 3.7 motor pings a little on 87 octane until I toss in a can of seafoam and run several tanks of 89. I feel like a lot of the 87 especially in multi-branded fuels (sam's, Kroger, speedway, etc) is just not a great fuel to use in any vehicle. They design these new turbo charged motors to "accept" 87 fuel, but that doesn't mean your motor is going to like it. If I had a new 2.5T I'd run a higher octane if for nothing else to prolong engine life.

  12. #12
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    Sound like really cheap fuel.

    Knocking, ticking, etc. is very bad for a forced induction motors as that's normally a lean condition. LEAN = Bad...very bad / RICH = Not Bad...computer is compensating and making fuel adjustments to be safe.

    Either fill up with 93 octane to see if the noice is still there or dump a can of octane booster in it now (while it's full).

    I bet the noise goes away with higher octane. Lots of fuel stations water their gas down with Methanol. There are warnings on the pumps here in the States.

  13. #13
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    Quote Originally Posted by helbigtw View Post
    Maybe I'm out of place and need to stick to my own generation of cx-9 threads, but is this a Ford motor? My work vehicle which is a Ford Escape 1.6T ecoboost has always pinged a little. Even my CX-9 3.7 motor pings a little on 87 octane until I toss in a can of seafoam and run several tanks of 89. I feel like a lot of the 87 especially in multi-branded fuels (sam's, Kroger, speedway, etc) is just not a great fuel to use in any vehicle. They design these new turbo charged motors to "accept" 87 fuel, but that doesn't mean your motor is going to like it. If I had a new 2.5T I'd run a higher octane if for nothing else to prolong engine life.
    No, this is not the Ford motor. this is a brand new Mazda-engineered engine 2.5L Turbo 4-cylinder in the new (16 and 17 CX-9).

  14. #14
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    I've run Shell 87 octane for over 7k miles and haven't noticed this issue.
    2017 Soul Red Crystal Metallic CX-5 GT/Premium
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  15. #15
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    Can you not use a datalogger like Torque to see if it will read knock values from your car? If your car was knocking, you would definitely notice it and you will feel the loss of power as the ECU will pull timing to try and save the engine.


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