I have a 2013 Mazda5 Automatic. I have been struggling to figure out what is causing a slight rattling noise in what seems to be located in the engine. When I accelerate high speeds between 80km - 90km/h. At first I was not able to duplicate the problem, so I tried a couple of things that would hopefully resolve the issue. After looking around on the internet, it advised that air/fuel combustion could be misfiring and to try premium fuel. This did not resolve the issue. It also advised that the fuel injectors could be dirty ad might not be providing adequate fuel in the cylinders. I tried some Gumout All In One, and after this I tried lucas oil upper valve lubricant fuel system cleaner. This did noy resolve the issue.

After more investigation, I was finally able to pin down when the rattling occurs. I switched to manual mode and found that the rattling occurs when I accelerate, between 1750 and 2000 rpm on 5th gear. The rattling goes away, shortly I after it goes above 2000rpm.

Has anyones encountered this issue before? any insight is much appreciated. Thanks

 

I have the exact same thing. A light rattling or ticking type of sound between 1900 and 2200 revs in my case when lightly pressing on the throttle. Seems to come from under dash or hood.

I've had two mechanics listen whilst driving and they don't know. Heat Shields and exhaust are apparently all fine. I've had the engine mounts all replaced. Tried to isolate all things that might be rattling. Tried higher octane fuel.

Have you figured this out? It is getting on my nerves.

 

If you are seeing oil by the axle then it is coming from the transmission. Where the axle and trans meet there is an oil seal, a good mechanic will replace it when doing a cv axle.

Have you ever checked the fluid level in your transmission before the axle replacement? Most people can't do this by themselves because it requires a plug to be removed on 192.168.100.1 192.168.1.1 the transmission.

 

UPDATE: So I had taken my Mazda5 for it routine maintenance at 80,000 km. Oil Change, Brake Service, and they also added the Throttle Body Service, as they did not have a record of it being done, and notice carbon buildup. Surprisingly after this service, I have not heard the rattle ever since. It has been over two months and have everything I can to get it to rattle again. I believe it's been fixed for me. Hope this helps anyone having a similar issue.