iwontevercare

Ok, so I made a post about this noise before.

Basically I got a new engine from mazda, and I had this noise. After 300 miles, that motor broke and now I got another new one.

Mazda told me the reason why those two motors broke is because the coils were bad so we replaced them (Typical dealership excuses, but whatever I paid for it anyways)

So today I got the car back again, and its making that same noise again!

I found a video on youtube that resembles the exact noise. From what i gathered after researching it, its a wheel bearing issue? But I only heard it twice today for about 3 seconds each.

But HONESTLY, it does sound like its coming from my front left wheel.

Heres a video, its the same sound, but mine just doesn't sound that long.

Edit: Would a transmission fluid change help? After researching further, im hearing its a transmission issue and it needs to be lubricated. Idk.

Loki

iTrader: (1)

So the coils are the pretty much the leading cause of death for engines, you should keep an eye on them. Many threads here about that. The dealer should have known to test that the first time, but anyway.

For the noise, to me it doesn't sound like wheel bearing. Wheel bearing noise is more constant. If it sounds like it's coming from outside, maybe check the cat heatshield?

poacherinthezoo

Doesn't sound like a wheel bearing to me (easy way to check is to park the car, grab the wheel's spokes and pull it towards you a few times with moderate force, repeat process at each wheel - if the bearing is bad you will feel and hear it moving back and forth).

With you history of 2 recent engine failures, and the noise's apparent correlation with engine RPM (video isn't conclusive on this), I would look at the fuel pump (under the river's side rear seat cushion). That makes a grinding noise as it starts to die, and frequently fails on series 1 cars (typically in the 50-100k mile range). Running lean/lean spikes from insufficient fuel delivery can cause engine failure.