You will even notice that once the catalytic converter reaches temperature, you may not hear it again. Whenever you hear a ticking or knocking noise coming from the catalytic converter, this might be caused by one of several problems. Some cars do indeed make this kind of sound while idling.
The heat shield bolts should be tightened to factory spec. But you should try to jiggle the heat shield. To know how much to fix the heat shield rattle, your vehicle needs to be taken to the repair shop for assessment. Note that it is illegal to drive your car without a heat shield on the catalytic converter. A catalytic converter without a heat shield can heat the interior of the car, which may cause a fire if you park on dry grass. It may be enough to increase airflow and stop rattling noises.
If the heat shield is missing bolts or has become loose, it can cause excess noise while the car runs. This can be done by removing a few bolts. You may need to use some penetrating oil since the high heat can cause the bolts to be quite stubborn. Once removed, thoroughly wash the cat with soap and water.
If the inside is hazy, you can polish it with some high-grit sandpaper to ensure maximum heat reflection. Before reinstalling the heat shield, add some anti-seize compound on the bolts. Make sure to tighten them to the proper torque specifications. A universal cat will require welding, while a vehicle-specific converter will be installed with bolts.
The first step is to douse the bolts with penetrating oil so they can be removed. Let it soak in for a while, then use a socket wrench to remove all four bolts. Installing the new cat is just as simple. Set it in place and insert all four bolts, making sure to add some anti-seize compound to each of them first. Wrench the bolts down to the proper torque specification. The catalysts in your converter could theoretically last forever since they are not consumed in the chemical reaction.
Other factors can cause a cat to lose functionality or fail, though. Likewise, a misfiring cylinder can cause the converter to overheat and drastically shorten its lifespan.
Short of these occurrences, your catalytic converter should continue to function without any issues. There are some ways to reduce this cost. The parts are a majority of the total price, but you can get a cheaper model by purchasing an aftermarket brand instead of an OEM device. Also, you could save even more by installing the new cat yourself. By following a few easy steps, you can prolong the life of yours, saving you trouble and headache in the long run.
Switching to high-octane fuel is the first step. This can help clean out your whole system, including your catalytic converter. Also, be sure to take your vehicle for regular maintenance. Engine tune-ups and inspections performed at regular intervals can alert you to any developing problems before they grow into something larger. If your check engine light comes on, be sure to get it to a mechanic right away to avoid costly damage. Your vehicle needs to be driven until it reaches operating temperature.
This will require driving for about 20 minutes at highway speeds. I suggest doing this at least once a week. If you found this article to be an aid in your catalytic converter research, please feel free to share it so that others can find it more easily as well. If you have any questions or comments, please leave them in the comment box below so that I can respond in kind. I work with noise all day, so I enjoy any peace and quiet I can find. I began looking at ways to improve the sound quality of my home and to make a soundproof office for myself.
I created this blog to share what I learned and to make it easier for you to improve your quiet space too. We are reader-supported. These kinds of temperatures are more than enough to automatically ignite grease, oil and transmission fluid, particularly if it happens to come into direct contact with the catalytic converter, often referred to simply as the "cat. Converter heat shield rattle is indeed annoying, but is remedied with a few basic materials.
Spray the converter's heat shield bolts with penetrating oil about an hour before you go to work on them. Converter bolts will heat-seize just like any other bolts in your exhaust system, and a bit of penetration oil can go a long way toward preventing a mishap with snapped bolt heads.
Remove the heat shield bolts and then the heat shield. Wash it with soap and water and take a look at its inside. Odds are that you'll find it dull and discolored.
You want the inside of your heat shield bright and shiny so that it reflects heat back toward the converter instead of soaking it up and radiating it into your back into your engine. Go ahead and polish the inside of the heat shield with some grit, grit and then grit sandpaper.
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