i don't know did anyone try this
try to start up my car....
cranking it.. then hurt a BIG BANG NOISE.. is like "BANNNNNNNNNG"
i was like WTF?.........
then try to crank it again and it starts... drive it for a while... shut it off.. and it starts again....

anyone heard that sound? sound like a gear is hitting a hard metal or hitting other gear..

 

Never heard that kind of sound, and don't recall anyone reporting such a sound on the forum. Doesn't sound good. Keep your senses tuned to engine and transmission operation to see if you notice any significant changes in performance.

There have been problems with bolts loosening up in the clutch/flywheel assembly in some early-build cars, so I suppose it could be that. You might want to take it in to a Mazda shop so that you can at least get the problem on the record in case of future catastrophic failure of a component.

 

Banging is bad.

From front or rear?

Could it have been an exhaust pop? Did you have an aminal under the hood? (Like in Florida sometimes snakes can get stuck in the belt)

 

It's hard to tell exactly what you mean, but you don't mean the "clack!" noise the fuel shutoff solenoid (or whatever that thing is that prevents pressurized fuel from flooding the engine when it's shut off) makes, do you? It is kind of loud.

Does it make the "bang" noise just when you shut the engine off?

 

^i know which noise u are talking about the shut off engine noise
nono
i am talking about when i start the car...

 

Try answering my questions.