why does my catalytic converter vibrates?

Question

This is my next question from the one before.
Info:It only vibrate when I start my engine (cold start) but once it heat up it was fine no more vibration.

Answer 1

when cold the insides of the cat must be loose for it to be vibrating, then as the cat heats up the insides expand and stop rattling, sounds like it is time to replace your cat.

Answer 2

All catalytic converters vibrate at one time or other. In your case the motor may be running a tad rich while warming up and at a given higher idol rpm certain pulsations and vibrations may cause the converter to shake and vibrate more than usual.

Let's start at the engine. It is connected to the front frame rails and the tail shaft of the transmission with rubber filled motor mounts so as not to vibrate everything inside your car while it's running. Your motor mounts are always in some state of movement. The engine vibrations however are transferred directly through the entire exhaust system as it's all bolted solid. Some front wheel drive cars have a flex joint directly behind the converter. The reason for this is front wheel motors torque twist front to rear. The flex joint allows the exhaust system this obvious extra movement. This is why the system is suspended with rubber filled exhaust pipe hangers. The system is allowed to flex and float with the motor torque movements and associated vibrations.

Answer 3

Good morning!
I recently had this happen to me just 2 weeks past. It started vibrating at first then got worse. God is good to you! You have a warning before real trouble begins. Have your converter checked by a mechanic. Mine was telling me the insides were breaking down and an eminet implosion was about to happen. If it "comes loose" inside, it will stop the flow of exaust, thus resulting in, no power, will not run at above 25mph, etc. or worse, wont run at all. Simply, it will plug your exaust.
Perhaps this is not the problem & you have a converter that is too close to "something"? like the frame & even this will eventually wear a hole in your converter. Remember, check around for an affordable mechanic. I checked with Midas Muffler? They wanted $750.00 to replace my converter, a 96 Ford Ranger 4 cyl. Go figure! I went outside the city metro area at a garage, he replaced my converter for $ 157.00
If worse comes to worse, go to a auto salvage & save even more. Just remember, the reason converters are so high is because they are coated inside with Platinum, thats higher in cost than gold!
Have a day!

Answer 4

catalytic converters are in user-friendly terms reliable for about 50,000 miles. Is your gas mileage incredibly undesirable? i'd say that's what it is. expenses mucho deniro to interchange inspite of the incontrovertible fact that it is worth it. some muffler shops can run a bypass inspite of the incontrovertible fact that it is unlawful to try this with smog polution and damages to the ozone layer regulations now.

Answer 5

Most Cats have a heat shield covering them to prevent them damaging other components - check that that hasn't worked loose. It did on mine, so I just covered it in a massive jubilee clip - did the trick perfectly until someone went into the back of me :(

Answer 6

this problem will only get worst, its getting clogged. They put platinum in that (thats the catalist) its gonna nneed replaced in the next few months. I hit mine with a rubber mallot to temp unclog it, that wont work for ever

Answer 7

because the fixings are loose and when the car warms up the loose fixings expand and so tighten

Answer 8

depends where its located i guess.. I mean some things like land rovers have them under the car, where the exhaust is

going over humps fast will not do that any favours..

you could go garage and get it checked.. maybe its the mounting for it.. i dunno other than that.

Answer 9

It might have a broken element and needs to be replaced soon ~~

Answer 10

sounds like you need service soon