Cats rattling or heat shield?
03-10-2012, 09:57 PM
#1
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Year: 1996
Model: Cherokee
Engine: 4.0
Cats rattling or heat shield?
I have a rattle coming from the exhaust on idle and take off. I don't hear the rattle while driving. Any thoughts on further diagnostics to tell what it is?
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03-11-2012, 07:29 AM
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Year: 1992
Model: Comanche
Engine: 4.0
Originally Posted by cico
Roger that...
Originally Posted by Dirk Digler
Beat the cat, I hate cats.
03-11-2012, 10:32 AM
#9
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Year: 1998
Model: Cherokee
Engine: 4.0L
Inside the cat, is a ceramic honeycomb core.
Sometimes they get a "hot spot" inside & start to crack. Then little chunks bounce around & sometimes work their way out & fall on the ground behind your vehicle.
This would signal a possible fuel mixture problem & the unfortunate end of the converter.
Sometimes they get a "hot spot" inside & start to crack. Then little chunks bounce around & sometimes work their way out & fall on the ground behind your vehicle.
This would signal a possible fuel mixture problem & the unfortunate end of the converter.
03-11-2012, 10:56 PM
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Year: 1994
Model: Cherokee
Engine: 4.0L I6 HO
If you do have a bad cat, replace it with this one.
http://www.davesport.com/cgi-bin/davesport/DCAT100.html
It's a metal cat that will handle the exhaust temps of a Jeep and it will flow better than most other cats.
Some fabrication will be required, but a muffler shop should be able to handle it.
http://www.davesport.com/cgi-bin/davesport/DCAT100.html
It's a metal cat that will handle the exhaust temps of a Jeep and it will flow better than most other cats.
Some fabrication will be required, but a muffler shop should be able to handle it.
Last edited by alnielsen; 03-11-2012 at 10:58 PM.
03-12-2012, 07:00 AM
#13
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Year: 1995
Model: Cherokee
Engine: 4.0
Check EVERYTHING !!!!!!!!!
And I mean EVERYTHING !!!!!!!
I thought my CAT was rattling, even began looking into which one to order.
Then one day, while in the driveway idling, I heard something fall to the ground and the rattling stopped!
It was a CLAMP that was rusted off.
Push/Pull/Tugg on all the clamps and hangars.
And I mean EVERYTHING !!!!!!!
I thought my CAT was rattling, even began looking into which one to order.
Then one day, while in the driveway idling, I heard something fall to the ground and the rattling stopped!
It was a CLAMP that was rusted off.
Push/Pull/Tugg on all the clamps and hangars.
03-12-2012, 08:23 AM
#14
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Year: 1997
Model: Cherokee
Engine: 4.0L
The most common cause is the heat shield. In most situations the heat shield is wrapped around the cat like a clamshell and is held together with spot welds. They rust and separate, causing a rattle. I've fixed many by locating the offending weld then drilling through the weld with a self-tapping screw.