Question about 2003 Buick LeSabre

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Catalytic converter problems

Rattling during cold start

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Heat shield is most likley loose

Posted on Dec 25, 2013

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1 Answer

Rattling noise when idling


Under the car like the exhaust? Catalytic converters do that inside their metal shell or housing. Beat on it with your fist when it is cold to hear it. (Not running).

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Rattling catalytic converter 2001 s500


Once your catalytic converter starts rattling that means it has to be changed Not cheap either.

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My check engine light is on & a diagnostic code check says it could be the catalytic converter (140,000 miles on vehicle), a vacuum leak, or O2 Sensor. What in your opion would be the most probable...


The catalytic converter being bad will definitely cause a drop in mileage and also a loss of power. Do you hear a rattling type sound when the vehicle is started cold or just when the ignition is shut off? Also if you bang on the converter with your hand, you may be able to hear the loose material rattle inside if it is bad. I think your Explorer has four catalytic converters also. What are the specific codes you received?

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Banging from what may be the catalytic converter when the truck warms up.


When the truck is cold hit the converter with your hand. If it rattles you just confirmed that the cat is broken up internally. At first this will likely not cause any problems but eventually you will start to see a cat inefficiency code or worse the honeycomb can plug up the exhaust and cause a loss of power.

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Rattling sound from the exhaust


The metal shielding around your catalytic converter could be rattling or the rubber donut that holds the rear tailpipe could be bad. When your car is cold shake your tailpipe and see if you can reproduce the noise. If you can your tailpipe donut is likely bad. Three dollars at any auto parts store. If it does rattle when you shake your tailpipe then the heat shield for your convert could be loose. You need to tighten it up another piece of metal between it and the converter to keep it from rattling. If you hear the rattle when you go over bumps too then your exhuast is probably, loose. Crawl under there and stake shaking things, I am sure you'll find the problem

Apr 07, 2010 | 2002 Kia Rio

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There is a rattling when i start the truck. its also loud when in first gear to second. sounds toward back of truck. exhaust?


Yes sounds right, if you have recently had exhaust work done or been four wheeling or ran over something in the road something may have gotten bent and is hitting the under carrage,.If it is a higher mileage vehicle (100 K +) it may be the platnum in the catalytic converter is wearing down and rattling in the encasement, that can be tested by getting under the vehicle when it's cold and rapping the cat. converter fairley hard with your hand and listen for a rattling sound.

Feb 23, 2010 | 2000 Isuzu Trooper

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Rattling under car when car starts or is cold.


you will want to go to an exhaust shop to have them look for broken welds or brackets as well as the catalytic converter. if it has come apart inside it will create this issue. common.

Feb 22, 2010 | 2002 Mini Cooper

1 Answer

Replace muffler, not the catalytic converter which started to rattle. Stop running, will crank but will not start. can it be the catalytic converter.


if the converter is rattlin then it needs to be replaced because the element inside is broken. if the jeep still does not run try removing the catalytic converter to see if the restriction is too much. should start if the converter is restricted. if it doesnt maybe its whatever caused the converter to go bad in the first place

May 28, 2009 | 1996 Jeep Cherokee

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My subaru forester has a rattle in the catalytic converter can it be repaired


I bet its just a the heat shield on the catalytic converter. Subaru uses very thin metal and the heat shield is bolted as opposed to welded together. This rattle is extremely common on subys.

mrmopar is right that you should replace it.

however there is a quick fix that will stop the noise. Go pick up a 6" stainless steel hose clamp at the hardware store. put the hose clamp around the cat. It should be obvious whats loose when you look under the car.

if you are a little handy its not a hard job to do your self. Just 4 bolts. You can get a catalytic converter for $200 online. Get the gaskets too. shouldn't take more than an hour or two.

You will need to put the car on jack stands or rhino ramps to get access. Once you are under the car, the parts are easy to get to.

Always, always chock the tires when your under the car. You do not want a car to fall on you.


Apr 21, 2009 | 2002 Subaru Forester

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Engine noise at cold start-up.


Sounds like your oil pump inside the engine is not pumping oil fast enough when you start your vehicle its common problem for mitsubishi motors my car does the same thing.

good luck

Nov 04, 2008 | 2002 Mitsubishi Montero

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