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2014 Holden Calais rumble when cruising

My 2014 Holden Calais V V8 has got an acoustic rhythmic rumble when cruising at constant throttle between 1000-1250 rpm. It's been at a Holden service centre for over two months and they have replaced the tailshaft, auto transmission, and engine/suspension and exhaust mounts with little change to the rumble. They have also put on different wheels/tyres and exhaust from another Calais. Holden concluded that: "it's a known characteristic with AFM engines" and nothing else can be done. Have you or your colleagues experienced the rumble? Was it a known characteristic to you? Is there a cure? I find it hard to believe that the "Flagship" of the Commodore range isn't as smooth as lesser models.

It's not something that I have come across, and I'm not aware of it being a known problem. Without being able to hear it it's hard to point you in the right direction. The dealer has done everything you would think of doing, but without isolating the cause. You could try changing the torque convertor, check that the brakes aren't warped, and replace the wheel bearings.

 

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