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Thread: Dangerous cylinder deactivation trouble on 2018 CX-5 and 6 models

  1. #511
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    cx5 gt +pp 2018

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    https://www.mazdarecallinfo.com
    run it there. if it doesnt show,
    Enjoy the nice car.

  2. #512
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    Quote Originally Posted by cz5gt View Post
    https://www.mazdarecallinfo.com
    run it there. if it doesnt show,
    Enjoy the nice car.
    Thanks for the prompt response! I ran my vin at that site and it shows one closed recall. Does that mean the fix was applied before I bought the vehicle?

    Sorry for the noob question by the way.

  3. #513
    Structural Member shadonoz's Avatar
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    Quote Originally Posted by dancx-5 View Post
    Well guys, guess who just bought a 2019 CX-5 Touring last saturday (lol)? Love the car but this problem stresses me out. This is my first new car and I have a 2 year old son who I drive all over the place. I ran my VIN number and didn't see any recalls for it yet.

    What should I do?
    You should relax and enjoy your new car! Even with the recall issues, it's still the best.

    Just don't try any risky maneuvers... but I'm sure you won't with a 2 year old in the car anyway.

  4. #514
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    Quote Originally Posted by dancx-5 View Post
    Thanks for the prompt response! I ran my vin at that site and it shows one closed recall. Does that mean the fix was applied before I bought the vehicle?

    Sorry for the noob question by the way.
    Yours was fixed. My status still says 'Incomplete; Remedy not yet available'

  5. #515
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    Quote Originally Posted by MyFirstMazda View Post
    Yours was fixed. My status still says 'Incomplete; Remedy not yet available'
    What problem is that for, if I may ask?

  6. #516
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    Guys thanks for your time. I look forward to spending more time on the forums and learning more about the CX-5 and other Mazdas in general. I love my CX-5 and chose it over other cars after nearly 2 years of research and a few years of saving. I love the design language of the cars and Mazda's emphasis on handling.

  7. #517
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    Question: This engine with CD is used in the 3 and the 6, and is not unique to the CX-5. Does this recall include those as well?
    Just curious.

  8. #518
    Structural Member shadonoz's Avatar
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    Quote Originally Posted by Buzzman12 View Post
    Question: This engine with CD is used in the 3 and the 6, and is not unique to the CX-5. Does this recall include those as well?
    Just curious.
    yes

  9. #519
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    Quote Originally Posted by Avoidin Deer View Post
    What problem is that for, if I may ask?
    For the CD concern. I know one guy on the forum got his fixed and he is in NJ. I don't get why mine gets that message. I called the dealership a week or two ago and they said they didn't have the part yet and they would call me when they got the part in. I have delayed calling them because I want them to fix a few before me so they get some practice doing it
    Last edited by MyFirstMazda; 07-16-2019 at 09:04 PM.

  10. #520
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    Quote Originally Posted by dancx-5 View Post
    Guys thanks for your time. I look forward to spending more time on the forums and learning more about the CX-5 and other Mazdas in general. I love my CX-5 and chose it over other cars after nearly 2 years of research and a few years of saving. I love the design language of the cars and Mazda's emphasis on handling.
    There is a lot of knowledge here.

    My CX-5 is my first Mazda, and I also put a lot of research into before buying. Much of my research was asking NOOB questions here.

    Congrats on the new addition to the family! Oh, and congrats on the kid, too

  11. #521
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    Quote Originally Posted by MyFirstMazda View Post
    For the CD concern. I know one guy on the forum got his fixed and he is in NJ. I don't get why mine gets that message. I called the dealership a week or two ago and they said they didn't have the part yet and they would call me when they got the part in. I have delayed calling them because I want them to fix a few before me so they get some practice doing it
    Gotcha. That's a smart tactic.

    I hope you (and everyone else) get it remedied soon and can make this a distant memory...

  12. #522
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    $800 to visually inspect

    Quote Originally Posted by madar View Post
    Jeez...that's like a new set of tires!!
    Also keep in mind that if you do go forward and want it popped to visually inspect, you will need to have a new valve cover gasket to replace the old one to make sure it creates a good seal and donít start a new set of issues.

  13. #523
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    I saw mentioned earlier in the thread talk of running rich. I'm assuming this is because the rocker arm that fell is over an intake valve? Is this always the case or is it possible for a rocker to fall off an exhaust valve? Do exhaust valves have rocker arms? During CD, I doubt the rockers would change their pivot point and only stop the movement of the intake valves while the exhaust valves keep moving. I'm not an expert so please let me know if anything I say sounds off.

    Let's assume it's only a rocker over an intake valve that can fall off. Wouldn't an OBDII scanner tell you that one of your cylinders is running rich immediately after some spirited driving (if not a stored code, then atleast a pending code that doesn't trigger CEL)? I'm thinking of doing this after I get the PCM update and wanted to get some thoughts from you guys if this would just be a waste of time. My logic is that if the rocker arm is off, the intake valve is always shut no matter how hard I accelerate. This should throw atleast one pending code while accelerating hard. If a rocker is off but no code thrown while engine is running at its limited peak, then it's either not much of a concern anymore after the PCM update or Mazda disabled the throwing of relevant codes for those cylinders. I would like to doubt that it's the latter since thats very shady and has the potential to ruin their company reputation.

    Last question, is there a schematic I can refer to determine which valves are intake and which are exhaust? It's not clear which is which when looking at just the photos posted here. Thanks for those amazing high quality photos btw!
    Last edited by Codeniko; 07-20-2019 at 01:26 AM.

  14. #524
    Registered Member yrwei52's Avatar
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    Arrow Dangerous cylinder deactivation trouble on 2018 CX-5 and 6 models

    Quote Originally Posted by Codeniko View Post
    I saw mentioned earlier in the thread talk of running rich. I'm assuming this is because the rocker arm that fell is over an intake valve? Is this always the case or is it possible for a rocker to fall off an exhaust valve? Do exhaust valves have rocker arms? During CD, I doubt the rockers would change their pivot point and only stop the movement of the intake valves while the exhaust valves keep moving. I'm not an expert so please let me know if anything I say sounds off.

    Let's assume it's only a rocker over an intake valve that can fall off. Wouldn't an OBDII scanner tell you that one of your cylinders is running rich immediately after some spirited driving (if not a stored code, then atleast a pending code that doesn't trigger CEL)? I'm thinking of doing this after I get the PCM update and wanted to get some thoughts from you guys if this would just be a waste of time. My logic is that if the rocker arm is off, the intake valve is always shut no matter how hard I accelerate. This should throw atleast one pending code while accelerating hard. If a rocker is off but no code thrown while engine is running at its limited peak, then it's either not much of a concern anymore after the PCM update or Mazda disabled the throwing of relevant codes for those cylinders. I would like to doubt that it's the latter since thats very shady and has the potential to ruin their company reputation.

    Last question, is there a schematic I can refer to determine which valves are intake and which are exhaust? It's not clear which is which when looking at just the photos posted here. Thanks for those amazing high quality photos btw!
    Thereís a cutaway drawing and a short video showing the valve train on SkyActiv-G with cylinder deactivation from exhaust side by Inside Mazda:

    MAZDAíS NEW CYLINDER-DEACTIVATION OFFERS IMPROVED FUEL-EFFICIENCY WITHOUT SACRIFICING DRIVING PERFORMANCE

    I also took some screenshots out of the video in post #33 earlier in this thread.

    No, cylinder deactivation will shut off both intake and exhaust valves. Thus it requires more energy to compress and expand the air of disabled cylinders in a mostly sealed environment. This means the system isnít as efficient.

    So far we have only seen the very last of intake rocker arm of cylinder #4 fallen. Apparently thereís a pocket big enough to let the rocker arm fall. Others seem to be having no space to fall, but once a rocker arm is too loose to be out of position, the wobbling rocker arm definitely will hit some valve train components and damage them even thought the rocker arm has no place to fall.

  15. #525
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    2018 Mazda CX-5 Touring AWD

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    Noticed the recall when looking online at used 2018 CX-5ís, I bought mine last year. I didnít think too much about CD at the time so hopefully Mazda knows what theyíre doing. This is my first Mazda, almost bought a 3 in 2016 and almost bought one instead of my CX-5 last year, and the CX-5 was considerably more expensive. I love the CX-5 but feel a little iffy on long term reliability. So far, no issues. Took my car to redline twice today on the freeway and itís been as smooth as itís always been. I canít find the combination of features and driving quality like Mazda in what Iím willing to pay so I was even thinking about a 2018 3 if I can find a good one. My CX-5 is paid off so I have a little more wiggle room if this CD rocker arm turns out to be a longer term issue. Iím at 12,900 miles now on my CX-5 Touring AWD. Thank you to all of those who contributed to this thread, it was a good read!

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