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Old 09-13-2011, 04:05 PM   #1
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Default How to Replace Catalytic Converter

The cat converter has rattled on my 98 XJ since I bought it about a year and a half ago. Now, when I give it some gas, it's unresponsive for a bit and kind of sputters out before taking off. I'm also getting a "chugging" like sound when accelerating. I'm assuming that the cat converter is clogged.

My questions are:

1. Does it sound like my assumption on the bad cat converter is correct?
2. How do I go about replacing it cheaply? Can I cut the old one out with a hack saw and simply slide the new on into the exhaust pipe and fasten with exhaust clamps? That sounds too easy and I'm sure I'm missing something, but can't find a write up on it.

Please keep in mind that I do not want my CEL to be on and would need to be able to pass emissions.
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Old 09-13-2011, 04:18 PM   #2
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I would guess you need a tune up way before the cat is clogged. And the rattling is just the heat shield on the out side of the cat or on the under-body of your XJ. But if in fact you are right that is one way to change out your cat. If I were you I would use band clamps and not those crappy u-bolt ones that always leak and rust so fast they are not re useable. Welding it in is still the best way. Oh if your cel isn't on now then it isn't you cat. I would also take the time to clean your 02 sensors now as well as they can cause the issues your describing. That only costs a half a can of brake clean and should be done every tune up unless you hate money?
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Old 09-13-2011, 04:18 PM   #3
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The cat on our '98 was a factory "slip fit" at both ends and clamped. Depends on how rusty things are as to how easily it "un-slips". Ours popped right off at both ends.
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Old 09-13-2011, 04:22 PM   #4
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Quote:
Originally Posted by djb383 View Post
The cat on our '98 was a factory "slip fit" at both ends and clamped. Depends on how rusty things are as to how easily it "un-slips". Ours popped right off at both ends.
Sounds like yours was already replaced I have been under at least 20 97-99 and none of them were like that.
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Old 09-13-2011, 04:33 PM   #5
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X2!!!
I would also take the time to clean your 02 sensors now as well as they can cause the issues your describing. That only costs a half a can of brake clean and should be done every tune up unless you hate money?
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Old 09-13-2011, 04:42 PM   #6
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Looks original to me, but maybe not. Muff and cat had the Chrysler PentaStar on the cases.
Attached Thumbnails
How to Replace Catalytic Converter-004.jpg   How to Replace Catalytic Converter-005.jpg  
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Old 09-13-2011, 06:05 PM   #7
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First time I have seen a set up like that come stock. Normally see it all one welded piece or with a bolt flange thing.
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Old 09-13-2011, 06:24 PM   #8
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On my the cat is welded to the down pipe and clamped from there on.
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Old 09-13-2011, 06:53 PM   #9
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I believe the '98 FSM shows it's all clamped, except for the muff/tailpipe, they are welded.
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