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Unread 08-10-2013, 07:09 PM   #1
jermeyg
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2004 LJ Precat Failure

With a P0420 code. I removed my cat system and saw that one of the precat honeycomb was missing. Since everything seemed okay I ordered a new eastern cat system (20379) off rock auto put everything back together and kept driving.
http://www.rockauto.com/catalog/rafr...&parttype=5808

Well eventually on my way back from Moab on the I-70 I lost power and couldn't go over 50mph. It continued to get worse because the exhaust was clogged. So after some gracious jeepers got our Jeep home I removed the exhaust and made this little video to show what I found. Hopefully it helps

*disregard the welds on the pipe near the flange I was setting the welder for the new cat system.

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Unread 08-10-2013, 09:36 PM   #2
ckspeed
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Linky no worky....
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Unread 08-11-2013, 01:16 PM   #3
jermeyg
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Quote:
Originally Posted by ckspeed View Post
Linky no worky....
I am sorry about that. I think I finally got it fixed!
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Unread 08-11-2013, 01:28 PM   #4
1982cj8
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You always have to replace all 3 cats together. I purchased the eastern cats and removed the rear one when I did it, only the front cats are monitored so no check engine light and it runs better.
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Unread 08-11-2013, 02:21 PM   #5
jermeyg
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Yep I replaced all three myself although I didn't remove the third one. I imagine it probably run a little better and cooler.
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Unread 08-25-2013, 08:13 PM   #6
BMorrNH
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No way! I have a 2004 LJ, my dealership is trying to get $875 plus 2 hours for all 3, one piece. I have a local shop that wants $600 + 2 hours. Where can I buy my own one piece front pipe with all 3? It's rattling, I've noticed loss of power and poor gas mileage. Nothing alarming, but the front is rattling and check engine light is on and off every now and again.
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Unread 08-25-2013, 09:04 PM   #7
ckspeed
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Rockauto has them for around $300+/-
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Unread 08-26-2013, 04:06 AM   #8
clayduster71
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Ebay $327.18

I bought the whole thing from Midwest Auto for $327.18 delivered on Ebay the other day.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=350860795660
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Unread 08-26-2013, 07:31 AM   #9
jermeyg
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I got mine at rockauto as well. So far so good!
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Unread 08-26-2013, 08:41 AM   #10
gtospeeding
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why not remove the cat material (gut it) and bolt it back up?
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Unread 08-26-2013, 10:52 AM   #11
vishrb
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just installed the eastern cadalytic as well. Purchased from Rock Auto also. Just one day out so no real thoughts yet. Initial quality seems good.
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Unread 08-26-2013, 11:49 AM   #12
J03_TJ
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So I'm just curious, are you guys talking about a one piece item that contains all three cats and is bolt on? Or do you have to do some welding?
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Unread 08-26-2013, 01:51 PM   #13
jermeyg
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The eastern cat is a two piece bolt on setup. They give you an exhaust clamp to tighten the precat to the third cat. You can choose to weld them together if you choose. Adjustments need to be made if you are running a raised skid plate of course.
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Unread 08-26-2013, 04:27 PM   #14
vishrb
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Quote:
Originally Posted by J03_TJ View Post
So I'm just curious, are you guys talking about a one piece item that contains all three cats and is bolt on? Or do you have to do some welding?
Mine did not come with clamp. I had to buy one. but yes had all three cats. So far so good.
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Unread 08-26-2013, 10:44 PM   #15
J03_TJ
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Thanks. I have never been lucky enough to have a vehicle last long enough for cats to go out. Just thought I'd ask. Got another question for those that have experience with clamps. I cant help but go off of stories of clamps on exhaust coming loose, but don't really know if its hype or incorrect install reports. Does it matter that the clamps are up near the engine and probably the portion of the exhaust that gets the most vibration? Just wondering if clamps tend to work or they don't?
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