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Rattle in exhaust system before the catilatic converter

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Can only be broken converter material or heat shield.
I assume you were under there tapping on the exhaust, in
order to find the issue & ask?
What do you want to know?
You know there should be no rattle & if
there is inside & the converter is 12 years old
or more it has to go.

Posted on Jul 24, 2013

Testimonial: "Had a mechanic put it on a lift and suggested it is a filter pre cat??? I have no idea what he is talking about"

  • Anonymous Jul 24, 2013

    Wouldn't ask what he was talking about or have them put it back on the lift & show you. You can use the internet to study the term do have never heard You provided no vehicle so we don't know what the exhaust system has


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  • Cars & Trucks Master
  • 22,265 Answers

Would help if you posted the make model and year here ,best advice is to consult a local garage and post what they say

Posted on Jul 24, 2013

Testimonial: "2005 chevy Suburban 1500 Z71"


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Posted on Jan 02, 2017

  • 623 Answers

SOURCE: rattle

It may be the inside of the converter has come loose.

Posted on Sep 10, 2008

  • 253 Answers

SOURCE: Have 2003 Nissan Pathfinder. Engine rattles under acceleration.

I would have to hear it. may be the engine mounts.

Posted on Nov 27, 2009

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1 Answer

What's your problem? Exhaust overheating and engin looses power.

check the converter by having someone hold the gas down while you feel the flow out of the tailpipe it will get to a point and decrease it should push more with the acceleration if it dont change the catilatic converter

Mar 15, 2012 | Cars & Trucks

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there are accually four two on each side the top ones are right at the exhaust manifolds the lower ones are buy the catilatic converters

Dec 25, 2011 | 2002 Ford Mustang

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I have a codes for a 2003 saturn vue reading p0420

It is pointing to a bad catilatic converter, as well as possibly, 02 sensor. Hope this help you, thanks. Mike from fixya

Jun 13, 2011 | Saturn Vue Cars & Trucks

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There is a clog in the exhaust system. I have had the catalytic converter replaced and still have the clog. I cannot accelerate without the car engine fluttering.

if the converter was of the honey comb style then its possible that a piece of the old converter has broken off and lodge in the exhaust downstream from the converter causing a blockage in the exhaust system.the exhaust will have to be inspected to find the blockage from either tapping the exhaust to hear a rattle or visual inspection of the inside of the exhaust.

Apr 20, 2011 | 2004 Mitsubishi Galant

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Sounds like a rattle under the van when stopped or idleing

It is most likely an exhaust heat shield or a catalytic converter that is breaing apart inside. Get underthe van when it has cooled off and "thump" the exhaust with your fist to see if you can locate the rattle. Often, the heat shield welds break where they are attached to the catalytic converter. I have fixed many of them by taking 2 or 3 large screw-type hose clamps and screwing them together to make them long enough to reach all the way around the catalytic converter and tighten them down to stop the rattle. If the noise sounds like it is coming from INSIDE the converter, you will have to replace the catalyst. (or ignore the noise)

Mar 02, 2011 | Ford Windstar Cars & Trucks

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Doest pick up speed

It sounds like you have a clogged up catilatic converter on your exhaust system replace that and it should run better.

Apr 23, 2010 | 1989 Chevrolet Caprice

2 Answers

Have 2003 Nissan Pathfinder. Engine rattles under acceleration.

I would have to hear it. may be the engine mounts.

Nov 27, 2009 | 2005 Nissan Pathfinder

1 Answer

Were is the o2 sensor for bank 1 on a 96 grand am 3.1

Passenger side exhaust pipe. some have the exhaust pipe 02 sensor just before the cat and then after, so the post cat 02 sensor is number 1 and after catilatic converter will be #2 so look on the the exhaust pipe Number one cylinder is #1 bank. look on intake manifold to see the #1 plug.

Aug 17, 2009 | 1996 Pontiac Grand Am

4 Answers

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

1 Answer


It may be the inside of the converter has come loose.

Sep 10, 2008 | 2002 Ford Explorer

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