Help! 2021 CX-5 undiagnosed engine knock

[alexdemench]

Hi everyone, I hope you can help me out - this is driving me nuts.

I have a 2021 CX5 GS, skyactiv engine. Purchased new, all regular oil changes by dealer.

There's this engine chugging/knocking sound that varies with RPM, sounds almost like a diesel engine when it's there. No engine lights have ever come on.

But it's very intermittent. Will be present in summer or winter. More noticeable in the cold, or just after starting, but it'll last through my 20min commute. Happens in the summer in 20*C too.

I've brought it to the dealership twice but each time it isn't there when they examine it and tell me they don't see anything wrong.

I'm reaching the end of my warranty period and really worked this will cause premature engine failure and brick my car :/

Video attached and I'll add some other videos of abnormal/normal sounds in the comments.

Anyone have ideas or advice?
Thank you so so much in advance!

 

[alexdemench]

Same noise in 8*C, several months earlier

 

[alexdemench]

Normal (to me) revving engine

 

[Moonlighter]

Have you shown these videos to the dealer?

I did that when I had a intermittent issue with my previous CX5 and tha5 was all it took for them to act.

 

[alexdemench]

Have you shown these videos to the dealer?

I did that when I had a intermittent issue with my previous CX5 and tha5 was all it took for them to act.

Yeah emailed these videos and showed in person, but they say that unless the noise is there for them to examine, they can't really do anything :/
And it's so loud in the maintenance bay that I can barely hear the video/engine noises when I'm there myself.

I'm hoping someone here can point me in the right direction in terms of what it could be, so I can give them more specific direction...

 

[Mazdiod2]

I can hear that it's not normal. Does it vibrate more when it makes this noise?
You say intermittant. How often is that?

 

[alexdemench]

I can hear that it's not normal. Does it vibrate more when it makes this noise?
You say intermittant. How often is that?

No obvious vibration or lack of power that I've noticed. It'll come on for a period where every time I start it, it's there for a day or a few days. Then might go away for weeks at a time.

It's happened winter-summer-fall. Now this is the 2nd winter. Hasn't seemed to affect overall driveability and function, but I'm worried this will lead to some major issue in the powertrain prematurely.

I just can't think of what would be so intermittent like that :/

 

[Moonlighter]

Yeah emailed these videos and showed in person, but they say that unless the noise is there for them to examine, they can't really do anything :/
And it's so loud in the maintenance bay that I can barely hear the video/engine noises when I'm there myself.

I'm hoping someone here can point me in the right direction in terms of what it could be, so I can give them more specific direction...

Escalate to Mazda HQ.

Thats a pathetic response from the dealer.