Question about 2004 Acura MDX

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I have a 2004 MDX and its making grinding noise at 40mph and 60mph. Local auto repair shop say its catalyic converter. Does anyone have answer to the noise.

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I have personally never heard of a grinding catalytic. also, these vehicles are not known for cat failures (not to say it can't happen). my first suspicion would be a faulty wheel bearings or lumpy tire. next time you are driving, try swerving the car side to side and listen for if the tone of the noise slightly changes. if so, you can bet you have a bad bearing. i would get a second opinion on the noise, the best way to check and isolate a bearing noise is to put the car on a hoist and accelerate to the speed of the noise, with someone underneath using a stethescope probe to isolate the source of the noise. if the noise goes away on the hoist, you can bet its a tire noise. good luck!

Posted on Jun 01, 2010

  • Nikki May 09, 2012

    I have a 2004 MDX and I have the same noise when I hit 35 - 40 mph, it;s a vibration sound. I bought 4 new tires, had the wheel bearings checked out and I still have the noise. It to me also sounds like the cat converter to me. I had a Ford Thunderbird which also had the same vibrating sound at certain speeds. Ford did tell me they did have issues with the cat converters so my husband ended up taking it off after many attempts of Ford trying to repair it.
    When I called Acura regarding this issue all they said was it wouldn't tear up my car but I could bring it in for them to take a look at it. I never did take it in, being unemployed and disabled the last thing I need is to fork out mega bucks. I'll find out what it is someday, just hope it keeps running. Good luck.

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