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BMW 740i Muffler

Easy Troubleshooting Tips for Your BMW 740i Muffler

The seamless and peaceful ride that you experience with your BMW 740i is made possible by the efficient muffler in its exhaust system. This device minimizes the noise of the exhaust in your vehicle's internal combustion engine. It is located lengthwise underneath your vehicle and blows backwards at the rear. However, due to age, corrosion, and other factors, your BMW 740i muffler would eventually wear out. This could then be the culprit behind some of your car problems, such as hissing noises and even poor fuel economy. Here are some tips on how you can check if your muffler is still in good terms with the exhaust system:

Engine noise

Your BMW 740i muffler is meant to minimize the noise that your engine makes and not to cause it. So when it starts to get loud down under, then maybe your muffler is causing a riot. To confirm whether your muffler is acting up, you can start by removing it from your vehicle. Just make sure that it has cooled down since it can be very hot even after the engine has died. Shake the muffler and listen if there is a sound from inside. If you hear a soft rumbling and a small amount of debris falls off, then your muffler is still okay. But if you hear a rather loud crackling and a lot of debris comes out, then it is most probably deteriorated. Replace the muffler with a new one immediately to get rid of the noise.

Exhaust leaks

A hissing noise that could be caused by a crack or hole in the muffler could be very dangerous. When your muffler leaks, it puts you and your passengers at risk due to the carbon monoxide content of the gas. It could enter the passenger compartment via the cowl vent or firewall and cause poisoning. A little percent of this deadly gas could already cause headache and nausea immediately. It can also burn spark plugs and even plug boots. Before this happens to your muffler, inspect it for any signs of corrosion that might damage it and cause it to crack. Look for any discolored paint near the exhaust ports. Check the exhaust pipes connected to the muffler, the seams in the shells of the muffler, and even the hump in the exhaust pipe for any leaks. Replace any rusted or damaged part immediately.

  • Maintaining Your BMW 740i Muffler

    You can always drive your BMW 740i without having to hear the loud and unnecessary noise of your engine, only if you know how to keep your muffler in good shape. A muffler is an acoustic soundproofing device that minimizes the noise that your engine makes. If it gets broken or corroded because you did not maintain it properly, then you can endure the crackling sound of your engine. You can also enjoy inhaling carbon monoxide for two hours, and die in a while. You don't want that, do you? What you can do now is to start protecting it from premature wear. Here's a guide on how you can keep your BMW 740i muffler from making too much noise:


    Clean it regularly.

    Just like any other car components, you can always clean your muffler to keep it from wearing out caused by dirt buildup. Wipe the shell of the muffler using a cloth to remove the first layer of dirt. Next, wash it with soap and water. Wipe it dry. You can also buy aluminum or chrome polish, depending on the material of your muffler, and apply it evenly. And just like that, your muffler is more protected from getting dirty and rusty again.


    Don't clean the insides of your muffler.

    As much as you want to keep your muffler clean, you can clean the shell all you want, but just don't clean its interior. Pouring water or soap solution inside the muffler would only cause it to corrode and wear out faster. You can shake your muffler to get rid of the debris trapped inside. Just make sure that you won't be able to inhale any harmful gas that might come from it.


    Inspect it for leaks.

    As part of your regular car check-up, make sure to inspect your muffler's condition, as well as the other parts of the exhaust system for leaks, cracks, or missing fasteners. This is to ensure that there will be no exhaust leaks that could cause problems to your spark plugs and other components. Repair or replace damaged parts with new ones immediately.