I don't know what thread you're talking about, but sounds like a rod bearing in that case...
this one, lol http://www.mazdas247.com/forum/showthread.php?t=123773862
If it goes away when the motor warms up like mine does, I don't see that being a rod bearing.
That doesn't sound good, haha. Wheres the noise coming from? Passenger bottom?
i just change the oil and added some restore add. and the sound is still there. it sound like those old hondas(lawnmower) the sound is coming from the passenger side
I don't know what thread you're talking about, but sounds like a rod bearing in that case...
take off your heatshield and see if it the bolt on the top left they always get loose or come out