A loose bracket, rubber hanger or connector, or one that is badly corroded, can allow a muffler to rattle as the exhaust pipe bangs against another part of your vehicle when you accelerate or drive on bumpy roads, or even when you first start the car and it’s stationary and idling. If you are hearing a loud sound like pieces of metal contacting each other, it usually means that something is touching the exhaust pipe. This exhaust component is required by law to keep vehicles operating at acceptable noise levels. In most areas, hitting the road with a missing or damaged muffler is illegal. These opposing waves partially cancel out most of the original loud noise. Mufflers contain perforated tubes or baffled chambers that create opposing sound waves when sound waves from the engine travel into the muffler. In most cars, the muffler is installed in line with the exhaust pipe, and its job is to minimize the noise that comes from a car’s engine. Related: What Are Common Exhaust System Problems? What Causes a Muffler to Rattle? Is your muffler rattling? If so, let’s take a closer look at some of the possible causes and your repair options. When you hear a rattle, it could be caused by numerous things. One of the most common exhaust problems is a rattling sound. CARS.COM - Most exhaust problems can be diagnosed by paying attention to unfamiliar sounds or taking a look underneath the car.
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