2016 Mazda 6 making grinding noise - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 13 (permalink) Old 02-16-2019, 07:10 PM Thread Starter
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2016 Mazda 6 making grinding noise

Car is 3-1/2 years old with 27k miles. A few weeks ago I noticed a rumbling or grinding noise when accelerating from a stop. If you let off the gas slightly, it's there too. I have had the car since new and I know this isn't a normal noise. I turned it in to the dealer Friday and asked them to check it out. I asked them to check the heat shield and exhaust including brackets and gaskets. They said all were fine and test drove the car. They couldn't find anything wrong. The regular warranty is up, but not the power train warranty. Where should I go from here? Should I call Mazda and see if they can arrange for another dealer to look at it?


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post #2 of 13 (permalink) Old 02-17-2019, 09:33 AM
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I would try another dealership and/or independent shop (you trust) and pay diagnostics - once you have diagnostics, see if it's something dealership will cover and bring them diagnostics paper. Depending on what's wrong, either get it fixed at the dealer or at the shop. Wheel bearing noise?

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post #3 of 13 (permalink) Old 02-17-2019, 10:04 AM
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My first guess would be wheel bearings as well. Not uncommon for wheel bearings to take a hammering considering the 2016 GT runs on 19 inch rims and low profile 45s especially in winters where there are potholes everywhere. See if you can replicate the noise when the car is idling and take it across the rev range, if its only making the noise while in motion, i would start with the wheel bearings.
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post #4 of 13 (permalink) Old 02-17-2019, 07:59 PM Thread Starter
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I thought of wheel bearing noise. The noise is not constant, though. If you have ever driven a manual shift car and shifted into too high a gear for the speed you are going, the engine lugs and creates a growling sound. Of course, this car is an automatic, but it almost seems like maybe the gear ratio is not right. The problem is finding a competent mechanic that can listen to the noise and properly diagnose it. I'll post if and when I get it resolved.

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post #5 of 13 (permalink) Old 02-27-2019, 04:21 PM Thread Starter
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Updare:

Took the car to the dealer today for a 2-1/2 hour diagnostic check for which I paid $150. I went on a test drive with the mechanic. He heard the noise, but couldn't find the source so I'm back to square one. He checked the motor mounts, pulleys, torque converter, transmission including fluid level, heat shields, wheel bearings and complete exhaust system to include brackets hangers and gaskets. They will call Mazda for ideas, but I'm not expecting much. Guess I'll trade for something else once it's paid off. Car was flawless up to a month ago.

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post #6 of 13 (permalink) Old 02-27-2019, 05:16 PM
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post #7 of 13 (permalink) Old 02-27-2019, 06:28 PM
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Wheel bearings or CVs. If you turn sharply does the sound change?

Other possibility is the tires themselves. As they wear they can develop "interesting" noises they didn't have before.
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post #8 of 13 (permalink) Old 03-15-2019, 04:22 PM Thread Starter
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Turned out to be the belt tensioner. At least it's quiet now. I think next time I will try an independent shop since it's out of the regular warranty. I ended up paying quite a bit for diagnostic time, before they isolated and fixed the problem.

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post #9 of 13 (permalink) Old 03-18-2019, 12:08 PM
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My 2014 6 with the OEM Dunlops SP 5000 after 10-15K of use make noise. Not a grinding noise but enough to wonder if it is bearings. SO, it could be tire related.

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post #10 of 13 (permalink) Old 03-18-2019, 12:39 PM
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Quote:
Originally Posted by pecochran1 View Post
My 2014 6 with the OEM Dunlops SP 5000 after 10-15K of use make noise. Not a grinding noise but enough to wonder if it is bearings. SO, it could be tire related.
Easiest way to check bearings is to get the car on some (sturdy) jack stands only high enough to get the wheel off the ground, grab the wheel with one hand at noon, one at 6, and try to shake it. Do the same at 3 and 9.

If you can make the wheel move even a tiny bit back and forth, it's likely a bearing.

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