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Thread: 2016 CX-9 Loss of Power

  1. #16
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    2017 CX-9 GT Machine Gray

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    2016 CX-9 Loss of Power

    I experienced loss of power on accel the other day...I didn't mash the throttle, but instead gave it a slow but heavy dose of the pedal...An odd noise emitted on loss of power (maybe boost leak?)...i let off and all was fine. I had been running whatever 87 octane (and noticing some uneven boost) so I'm on 93 now with no further issues and smoother boost.

  2. #17
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    Update on my situation. The dealer has had our vehicle for over two weeks now. They had us driving it with a data recorder installed, but after experiencing several "limp mode" incidents, they asked to keep it and gave us a loaner CX-9. After sending the data recorder back to the Mazda engineers, the dealer was asked this week to install a different data recorder and try to reproduce the issue themselves. The issue tends to happen after driving for a while, but they apparently haven't driven it much, so they haven't been able to make it happen yet. Plus, if the issue is heat-related, the weather here has been cool lately, so it may be more difficult to reproduce. They think the issue might be related to a sensor - either a bad sensor or the software reacting incorrectly to the data from the sensor.

  3. #18
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    Mazda CX-5

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    Well, we had a happy ending. The engineers couldn't figure out the problem with our CX-9, so Mazda offered to buy back our vehicle and replace it with a new one. They gave us top dollar to trade my 2016 CX-9 (with 20,000 miles and engine issues) plus they gave me a boatload of incentives. We just picked up our brand new 2017 CX-9. Mazda did us right!

  4. #19
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    Thanks for the update, I'm happy that you were given an amicable solution.

  5. #20
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    Quote Originally Posted by seplant View Post
    Thanks for the replies. We're taking it in to the Mazda dealer tomorrow. Problem is that it only does this intermittently, so it probably won't act up while we have it there.
    Ok, that is a different problem. The original post did not indicate an "intermittent" condition. Intermittent by definition means that something is in the process of failing and not functioning consistently, or simply in a state of inconsistent operation.

    Most engine performance issues tend to reduce down to something having to do with:

    • Fuel
    • Air
    • Spark
    • Timing
    • Exhaust
    • Compression


    This is ground zero in most cases where most issues will lurk behind some Causation leading to some Effect. Initial checks you can make without a mechanic: Check for DTCs with an OBDII scanner (Home Screen > Applications > Select Warning Guidance).

    Though your 2016 should still be well under the warranty period, if you are so inclined you might want to at least try to troubleshoot the problem to a general fault. Having the DTCs may help in this regard as it starts to point you towards the system or sub-system possibly containing the malfunction. The nature of the DTC can help in determining the potential type of problem (mechanical, electrical, etc.).

    Having a Mazda 2016 CX-9 Workshop Service & Repair Manual would not hurt either - probably worth ordering from your dealer. Again, your 2016 is still under warranty and should ultimately be taken back to the dealer for repairs. However, when you do go back, you want to arrive in the service department having as much information about the potential problem as possible and at least trying to troubleshoot the matter (if at all possible) before hand could help.

    There is a difference between arriving at your dealer and telling them you have a "loss of power when you step on the accelerator pedal" and "There is an intermittent voltage irregularity going into the EGR Value. The result seems to be an intermittent loss of power on acceleration."

    There is a lot going on in front of and behind the new iSkyActive-G turbo charger to keep it spooled up at lower RPM. The new EGR design plays a role on the intake side to help keep temperatures low by routing exhaust gasses through the intercooler, but the controlled exhaust ports also play a vital role in keeping the turbos spooled as well. Both of these sub-systems would have a definitely impact on throttle response if either were malfunctioning. If the DPT value (Dynamic Pressure Turbo) which is normally constrictive at lower RPM, is somehow not opening as designed when you place a demand on the throttle, that would seem like a potential cause for "loss of power" as that 17+ lbs of "instant boost" is necessary to get things going. Without it, you could be experiencing severe lag.

    However, one of my initial concerns with this new iSkyActive-G design was its Direct Injection design. A lot of engines on the market these days are now direct injection and some of them suffer from carbon build-up on the back side of the values at relatively low mileage - leading to power loss. However, the kind of losses you are describing make carbon build-up on the valves as the exclusive causation seem fairly remote - but we don't yet know what the felt effects of direct injection carbon build-up on values will be with the iSkyActive-G because it is still a relatively brand new engine design. Time will tell and I am paying particular attention to my Valves along the way.

    Still, as someone has already stated here, being a 2016 CX-9 and having that kind of struggle in producing power under throttle makes me think in terms of ECM. As a sanity check, you can easily check the upper air intake system components for blockages (air cleaner body bottom, air filter, air cleaner body top, air pipe, air inlet hose, mass airflow sensor).

    Given the age and miles on the vehicle. This will probably turn out to be a really easy fix once you get a good trained mechanic troubleshooting it.

  6. #21
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    Quote Originally Posted by PTguy View Post
    No reports of carbon on the backs of the intake valves. In any case, that wouldn't be the same as seplant is reporting.

    Carbon on the backs of the intake valves is a result of the engine's crankcase breather system not adequately removing oil vapors before venting to the intake, plus direct fuel injection where no gasoline is in the intake air to wash off these valves. I think most engine makers have corrected this problem.

    I have to disagree somewhat. Ford, Volkswagen, Audi, BMW and GM's Cadillac division are still dealing with this issue, though aggregate reporting of these problems has fallen over the years since mass production of DI engines hit the market. By my evaluation - it is still a problem. However, manufacturers have had to deal with emissions regulations that kept coming over the years and this has been part of the price of admission. Toyota, Honda and Acura as far as "mass producers" go have done a better job, but that could very well be because they came late to the party, sat back and went to school on all those problems everyone else initially had.

    Ford, has probably been the poster child for DI carbon problems, however.

  7. #22
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    Quote Originally Posted by seplant View Post
    Well, we had a happy ending. The engineers couldn't figure out the problem with our CX-9, so Mazda offered to buy back our vehicle and replace it with a new one. They gave us top dollar to trade my 2016 CX-9 (with 20,000 miles and engine issues) plus they gave me a boatload of incentives. We just picked up our brand new 2017 CX-9. Mazda did us right!

    Wow! I just now read this far. They offered you top dollar and a new 2017. That was a class act, indeed. Kudos to Mazda Corporate for doing that, no doubt - and great for you! Congratulations!

    However, I'm now more perplexed than I was before I wrote my initial reply. I now have even more questions given my history with GM and a C5 Corvette that lost significant power above 4,300 RPM both on the road under actual loads and on the dyno. GM never offered to buy back anything by the way and they never were able to solve the problem. I guess that just shows the difference between the two companies.

    Still, I'm left wondering now whether or not this anomaly will only show up in 2016 production lines of the CX-9 and if so, which drive train (Front Wheel only, AWD or both). If I'm guessing right about Mazda's integrity, they are probably now using your old 2016 as a research vehicle. I'm pretty sure you are happy with your new 2017, but I would sure like to know if this problem extends down the production time line and into any of the 2017s. I'm sure new 2018 owners and prospective owners want to know the same - as this was one of the first very serious issues that I've read about on the CX-9. Power loss that severe without a fix from the OEM is by definition a very serious issue.

    Anomalous lemons are going to statistically occur with any automobile manufacturer no matter who that manufacturer happens to be or what they make. It is the nature of the mass production. However, I would like to know if this was merely anomaly, or some kind of manufacturing flaw that only shows up under certain manufacturing conditions. It is obviously not a design flaw, else I would expect the number of reported instances to be significantly higher. I just want to know that it was not a lingering production error onsite that apparently got missed and then trickled into 2017s and 2018s.

    I wish there was a way to track what Mazda is actually learning from your 2016 CX-9.

  8. #23
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    Mazda CX-5

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    Quote Originally Posted by Cessna CJ4 View Post
    I wish there was a way to track what Mazda is actually learning from your 2016 CX-9.
    Our dealer let us know that Mazda had them replace the entire fuel injection system on our old 2016 CX-9. They won't know for sure if that fixed the issue until someone drives the vehicle for a while.

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