A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
Damage. Hole. Perished gasket. Incorrectly fitted. Corrosion.
No. It will cause a problem with both back pressure and noise.
Remove the muffler
Yes, because without one, the noise of the engine or motor would be too loud, and the muffler serves a purpose of applying back pressure for compression.
Something to check would be if there is rust in the break-drums that would need to be cleaned. Another possibility would be the strap around the muffler. Check to make sure it isn't broken. If it is, the muffler may be hitting part of the frame, hence the noise. Other than that, I have no idea.
What would cause a grinding noise after a tire is replaced and the brakes are not worn?
That's very likely, yes. Get it checked - a "flapping" exhauast system won't last long, but if you tend to it immediately, it may be an easy, permanent fix.
cause its weird
It is likely that the rat is sick so I would take it to the vet.
Maybe the muffler is bad.
Unlikely. A more probable cause would be that there's something wrong with the exhaust/muffler. A bad hub would have other symptoms, like poor steering, pulling when braking/acccelerating, vibration etc before you'd begin noticing the noise.
Because of condensation the inside of your muffler, the muffler will begin to deteriorate (rust) over time from the inside. This can and will cause holes in the muffler. Along with the hole (s) the internal structure of the muffler will eventually break apart and plug the muffler, preventing the exhaust gas and the pressure from the engine from exiting the vehicle. This will cause what is called "back pressure" on the engine, causing it to lose power. Extreme example would be "you push the gas pedal to the floor but the car will not go more the 25 miles per hour". I would recommend you have you muffler replace. That should solve your problem.
Not likely. But you know you have a hole in your muffler so unless you want to have an accident from carbon monoxide poisoning you should have it replaced ASAP. Then reset the light and if it does not come back on, you know that was the cause.
A whistling noise indicates a vacuum leak.
A buildup of raw fuel in the exhaust system is then ignited and damages the exhaust muffler or blows a pipe apart.
loose or bad u joints.
what would cause a knockings noise in my boat 3560- 2004 transmission when in idle goes away when you give it gas