Exhaust systems are regulated by the government. Many states' emissions tests require that the exhaust system, including the muffler, is fully functional and efficient. The muffler is one of the easiest portions of the exhaust system to monitor--either it is working or it is not. You can repair the muffler to address some issues, but you must replace it to fix most problems. A quick troubleshooting session can help determine what action is necessary.
Turn the vehicle off. For added safety, if the vehicle was recently run, allow it time to cool down because a muffler tends to get hot during operation.
Jack the car up high enough to see under the rear, following your manual's jacking procedure instructions.
Verify that the muffler is attached to the exhaust pipe. If it is not, take it to a local welder or exhaust shop to have it reattached.
Inspect the muffler to ensure it is whole and the muffler's body does not have visible holes or dents.
Replace the muffler immediately if there are signs of damage. Obtain a new muffler from your local parts store. With the rear of the car still jacked in the air, locate brackets that are holding the muffler in place. Loosen the brackets and slide the muffler out towards the rear of the vehicle.
Slide the new muffler into place, just as the previous muffler was. Utilize the mounting brackets to tighten the muffler back into place. Lower the car by releasing the jack slowly. Start the car and observe the muffler to ensure that exhaust is exiting the muffler port.
