I have a rattle, almost a buzzing sound, that comes from under my pick up truck sometimes. I hear it most often when I am pulling my boat when just pulling off from a stop. It drove me crazy! I finally found what was doing it. Its the catalytic converter! I had to replace a piece of my exhaust pipe and I told the guy that was working on it about the noise. He said," Lets see if it is the "cat" doing it". With the pipe off behind the catalytic converter you could look into the end of it. He shook the converter and sure enough it made the rattle sound. It turns out that some catalytic converters are made with material that shrinks a little after they have been used a few years and that lets the "guts" move around inside and rattle when the engine is under load like when I pull my boat or punch the gas to get out in traffic in a hurry. I took a hammer and knocked a small dent in the top, bottom and both sides of the catalytic converter's housing and put a stop to the racket! That beats the crap out of the alternatives, listening to it, paying several hundred bucks to replace it with one that will probably do the same thing or just taking it off and putting a piece of pipe in its place which happens to be illegal. The guy that was working on it said that he wasn't touching it but would make up the piece of pipe to replace it if I wanted to do it myself. I figured why bother as long as a few little dents would stop the aggravation.
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crwdns2944067:03crwdne2944067:0
In reply to my post of a temporary solution for cars catalytic rattle and extremely poor performance, putting a scissor jack under the converter and jacking up the car a bit so it collapses the converter, changes the flow of air and loose particles creating a better flow of output to increas performance enough to get you home
crwdns2934271:0crwdnd2934271:0 Paul Gadue crwdne2934271:0
Paul, what if this person's rattle is not from catalytic converter and they ruin there converter using your suggestion, costing them BIG$$$$ for nothing. I am not arguing the point that this could be a ((temporary fix)) for a bad clogged/loose baffle, but you would want to be positive the converter is bad and replace converter shortly afterwards. MY 2 cents, have a good day.
crwdns2934271:0crwdnd2934271:0 L Pfaff crwdne2934271:0
The quality of answers on ifixit is disappointing.
crwdns2934271:0crwdnd2934271:0 Daniel Powers crwdne2934271:0