2011 AWD CX-9 Shutter between 1200 and 1500 rpm

[giovannifer]

I have a 2011 mazda cx9 GT AWD. Recently ive experienced a shutter between 1200-1500 rpms and usually 5-6th gear. It goes away with constant acceleration and the shutter just keeps becoming more apparent. I took it to a shop where they diagnosed differential bushings, had those replaced, and my shutter came back. Ive done extensive research on this and when through the works. I replaced my coil packs, injectors, spark plugs, the whole 9. I even jacked the car up to try to see if the driveshaft had any play to see if it was the transfer case, it didnt. My last best guess is transmission, but i dont want to believe it lol. Anyone have any insight they can give me?

 

[Lazy2.5]

my guess would be the torque converter, but i highly recommend you have it properly diagnosed by another shop. you're just spitting into the dark otherwise.

 

[rowlands57]

Yes, sure sounds like the torque converter staying locked at lower speed/gear.

 

[Lazy2.5]

Yes, sure sounds like the torque converter staying locked at lower speed/gear.

My thoughts exactly.

@giovannifer if you have more than 80,000KM on your transmission and have never changed the filter, highly suggest you do so anyways. That would be the only other realistic culprit here, as you've replaced spark plugs and ignition coils.

 

[giovannifer]

My thoughts exactly.

@giovannifer if you have more than 80,000KM on your transmission and have never changed the filter, highly suggest you do so anyways. That would be the only other realistic culprit here, as you've replaced spark plugs and ignition coils.

It ended up being the torque converter and the transfer case. I'm starting to feel a vibration in the rear right of the vehicle now, The mechanic diagnosed differential bearings or something of that nature, which gave the axles a whole lotta play.