Useully caused by a backfire thru the exhaust from poor ignition gases built up
Your bad muffler might be part of the reason your check engine light comes on. Usually, your bad muffler causes something else to go wrong and that causes your check engine light to come on. Problems cascade.
A hole in a muffler is from two causes. It has either rusted through or been damaged by something hitting it.
loud, and shety muffler
Fatigue, maybe from missing or broken hangers.
hotness
If the toenail is too long or if it is dry, then it will split.
A muffler going bad can be caused by many things. But generally, it is either contact with the ground causing a dent, oil burning causing sludge and residue in the muffler, or corrosion from age and moisture in the exhaust pipe causing a hole or the collapse of baffles.
If you are running at high rpms and turn the key off the unburned fuel will be pumped from the cylinders in the engine into the muffler. The muffler is still hot enough to ignite the unburned fuel.
Uneven watering.
When you chew on it. Or if your cuticals are crusty, then it will rip.
sometimes when you have a split down the middle of your toungue, its from eating many sour items,
the muffler rattling? the muffler rattling? the muffler rattling?