Heat shield on catalytic converter?
Octane rating of fuel not high enough
Timing too far advanced
Catalytic converter itself
Possibly a loose heat shield or other component.
It may be the heat shields on the exhaust system vibrating.
The rattling sound in the front of a 1995 Honda Civic wheels can be caused by wheel bearings. These bearing allow the wheel to turn and when they fail the produce a loud noise.
If it's a type of clunking noise, check your gearbox. If it's some kind of rattling, check your hubcaps.
It is the alternator....
no oil
Many different things can cause a rattling noise in a Mazda tribute. Stark by checking the engine belts and all brackets for anything that could be loose and causing a rattle.
what kind of noise?
Well without further analysis or information, a short answer would be that your engine is BROKEN.
The guy in the trunk is still alive!!!
Bad ignition coil
The most common cause is slipping belt