Crazy Rattling Noise From Exhaust/Underneath - Defender Source
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  #1  
Old January 25th, 2008, 05:49 AM
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Crazy Rattling Noise From Exhaust/Underneath

First I will tell you that it has been colder than a witches tit here the past week so I have not had a chance to crawl under Grover to try and pinpoint this noise. All of a sudden last week I started getting a rattling noise from underneath, in the area directly under the passengers, more on the right side. It does not do it when the vehicle is cold, only once it has warmed up. It won't make the noise at idle. The only time it makes this kinda hollow rattling noise is when I accellerate, say between 1500 and 2500 rpm (est). It almost sounds something like a piece of metal tapping on the exhaust. It will make this noise while in neutral, so no tranny or tcase issues. I would think if it was a stuck valve or lifter it would make the noise when cold and go away after warming up...

With this vague description, does anyone have any ideas?
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  #2  
Old January 25th, 2008, 07:09 AM
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Time for some new cats. Honycomb breaking up inside the catalytic (sp?) converter. Fix it before it clogs up solid makes the exhaust redder than hot and burns the truck to the ground.


or it could just be something metal banging against the exhaust
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.

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  #3  
Old January 25th, 2008, 09:39 AM
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2nd that, it's the cats alright, been there done that. Easy fix though that any old muffler shop can do. If you want some good sound, consider going ahead and doing a Flowmaster muffler while they are under there. I have 40 series and love it. It has a nice growl, but not obnoxious.
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  #4  
Old January 25th, 2008, 11:27 AM
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Cats. I replaced mine about 3 months ago. Flowmaster universal cats, got off amazon for about $60/each and had my muffler shop install them. Oddly, amazon was the cheapest place I could find anywhere, including shipping...
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Old January 25th, 2008, 01:04 PM
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Wow, thanks guys! I already have a new NRP muffler and exhaust. I will replace the cats with some Flowmasters. I am glad it should just be something simple like the cats.....

Follow-up Post:

Quote:
Originally Posted by Davis
Cats. I replaced mine about 3 months ago. Flowmaster universal cats, got off amazon for about $60/each and had my muffler shop install them. Oddly, amazon was the cheapest place I could find anywhere, including shipping...
Any idea what the part number was?

Follow-up Post:

Did you mean Magnaflow Universal Cats #94004?
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  #6  
Old January 25th, 2008, 08:08 PM
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I was thinking about those Magnaflows since I already have a muffler and I like it. If I hit the muffler I can hear something in there i think it parts of my cats. Could any increase in power/economy be expected from those magnaflow cats??
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Old January 26th, 2008, 02:51 AM
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Yeah, I was thinking of those magnaflows...thanks!
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Old February 9th, 2008, 06:23 PM
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Just as a follow-up, I replaced both Cats with some Magnaflows and the noise is gone!
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Old February 9th, 2008, 06:50 PM
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do you have part numbers for the Magnaflow cats? What muffler do you have?
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Old February 9th, 2008, 09:26 PM
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Magnaflow Universal Cats #94004. However, I would do some research to find ones that are 2" ID versus 2"OD. It would have been so much easier to slip them on and weld them versus butt-welding them.

I am running NRP exhaust.
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Old February 10th, 2008, 11:39 AM
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Get a 2" ID sleeve--makes life easy. Or just cut two 3" pieces of 2" ID tubing.
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Old February 10th, 2008, 11:57 AM
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Quote:
Originally Posted by Jeep Rescue
Magnaflow Universal Cats #94004. However, I would do some research to find ones that are 2" ID versus 2"OD. It would have been so much easier to slip them on and weld them versus butt-welding them.

I am running NRP exhaust.
Is your tubing into and out of the cats offset on one side (I think its the passenger side)? If so how did your muffler shop get around this b/c my shop says that they need to redo the whole system? I think they are screwing with me?

Did yo also replace your O2 sensors?
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  #13  
Old February 10th, 2008, 04:03 PM
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Quote:
Originally Posted by Davis
Get a 2" ID sleeve--makes life easy. Or just cut two 3" pieces of 2" ID tubing.
Yeah, crappy auto parts places were out.

Quote:
Originally Posted by mdmccallum
Is your tubing into and out of the cats offset on one side (I think its the passenger side)? If so how did your muffler shop get around this b/c my shop says that they need to redo the whole system? I think they are screwing with me?

Did yo also replace your O2 sensors?
My passenger side did have an offset cat, meaning the exhaust entered towards the top (when viewed from the side) and existed towards the bottom. That should not make any difference when installing a cat with centered entrance and exits. I welded my own, but any reputable muffler should should be able to make them work.

I did not replace the O2 sensors, but should have.
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  #14  
Old February 10th, 2008, 06:09 PM
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I did not replace my O2 sensors. Probably should, but at the same time, I have no indicator that they are going bad. Question is if the Cats went bad due to the O2 sensors or if they just wore out--just don't know. Does anyone have a check for this? I have no codes thrown...
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  #15  
Old April 6th, 2009, 07:12 PM
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I can hear the DS cat rattling around. I have a code 44. I hope to get it replaced this week.
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