Clarity on NY XJ catalytic converters emissions type - Page 4 - JeepForum.com
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post #46 of 66 Old 01-01-2020, 09:04 AM
axlaxl
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Originally Posted by Fourspeedman View Post
LISurfcaster are you saying the O2 sensors are also CARB required?!? I looked them up and only the expensive MOPAR units even mention that. I just bought four BOSCH sensors for the 4.0 I am rebuilding because I always had good service from BOSCH sensors. Did I screw up? Four MOPARs would cost almost $500.
I've never heard, seen or read anything about O2's needing to be CARB certified, just CATs.

For the record, generally speaking the NTK O2's are the preferred sensor for the 4.0l. Just a thought, if you can return the Bosch and get the NTK's most people here would suggest you do so. Nothing wrong with Bosch overall, just on the 4.0l on an XJ they can be finicky. I use Bosch on my MX-5 where it is the preferred O2.

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post #47 of 66 Old 01-01-2020, 09:54 AM
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Axlaxl- thanks for the heads-up. I did a search and found all the bad reviews about Bosch. No go on Jeeps? I never would have known. Back they go. EDIT: NTK's on the way.

Mark in Queens- Home of Spiderman and the Ramones
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post #48 of 66 Old 01-01-2020, 09:56 AM
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Originally Posted by axlaxl View Post
I've never heard, seen or read anything about O2's needing to be CARB certified, just CATs.



For the record, generally speaking the NTK O2's are the preferred sensor for the 4.0l. Just a thought, if you can return the Bosch and get the NTK's most people here would suggest you do so. Nothing wrong with Bosch overall, just on the 4.0l on an XJ they can be finicky. I use Bosch on my MX-5 where it is the preferred O2.


That go for spark plugs as well?
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post #49 of 66 Old 01-01-2020, 12:00 PM
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I have Bosch platinum plugs on both my XJs and they run fine. Let's see what the others say. I know platinum is required on waste-fire ignition systems like ours to resist electrode decay. The only upgrade I know of is Iridium plugs. I can vouch for Iridium being a superior material but you will pay a premium that I consider worth it.

Mark in Queens- Home of Spiderman and the Ramones
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post #50 of 66 Old 01-01-2020, 12:05 PM
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Originally Posted by Fourspeedman View Post
I have Bosch platinum plugs on both my XJs and they run fine. Let's see what the others say. I know platinum is required on waste-fire ignition systems like ours to resist electrode decay. The only upgrade I know of is Iridium plugs. I can vouch for Iridium being a superior material but you will pay a premium that I consider worth it.
Be frank with you I vote cheap Champion Copper tops.
After about 20K.
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post #51 of 66 Old 01-01-2020, 06:25 PM
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I used the Bosch for years because they were the cheapest platinum available then. I tried the Iridium in my Wife's car at 50k. At 100k I went to change them and they were as clean as the new ones. I actually saved them for in case I stupidly break one sometime. (don't ask)

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post #52 of 66 Old 01-02-2020, 12:06 AM
Ralph77
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I actually saved them for in case I stupidly break one sometime. (don't ask)
Don't have to explain anything to me.
I have practically every part I ever removed and replaced or upgraded from my Jeep.
I don't throw anything out. Never know what might come in handy.
My usual MO is if I sell the vehicle ask the new owner if they want the stuff. If not it gets tossed.
If the vehicle is getting junked it all ends up inside it. LOL.
Besides stuff that has a core I don't have most of the exhaust from when I replaced it.
But that is because I sold the cats for scrap.
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post #53 of 66 Old 01-02-2020, 04:29 PM
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Was looking to see if I had a picture for somebody on another thread here and I came a what was advertised as a Federal Emissions XJ exhaust on Craigslist.
See how the Y Pipe is one pipe all the way to the cat?
Also I believe this to be a pre 1/20/00 build date cause everything is slip on.

EDIT: If this and the other shot I posted are correct XJ parts I wonder if the one piece pipe thing is a pre 1/20/00 thing.
All I have for a shot is the one earlier in the thread and it does not show if it is slip on or flange.
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post #54 of 66 Old 01-02-2020, 08:12 PM
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Attached is from the Walker Exhaust web site and I can confirm these are the parts needed on a Cali exhaust XJ
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post #55 of 66 Old 01-02-2020, 10:16 PM
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^^^ Exactly as my 2001xj CA emissions ^^^^ Plus 5 O2 sensors. and a couple of hangers.
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post #56 of 66 Old 01-02-2020, 10:18 PM
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Bosh O2s are notorious to cause issues with Jeep and Chrysler. Nothing wrong with the brand, their calibration is completely off for our application (meaning their resistance value is not exactly what PCM expects).

Plugs need to be copper core. Iridium is the wrong heat range.

If you use the wrong stuff and are lucky, you may never experience issues with engine operations, yet still run around in circles trying to figure out why you are failling smog.

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91 XJ 4.0 - Avital 4103, Stage-2 aFe intake system, BBK high flow Throttle Body, 703s injectors, Jones Exhaust A3518M-5
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post #57 of 66 Old 01-03-2020, 12:25 AM
Ralph77
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Originally Posted by axlaxl View Post
Attached is from the Walker Exhaust web site and I can confirm these are the parts needed on a Cali exhaust XJ
Same here but only for a build date of after 1/20/00.


Quote:
Originally Posted by Michaelj51 View Post
Plus 5 O2 sensors. and a couple of hangers.
5 O2 sensors?
On behind the rear cat?
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post #58 of 66 Old 01-03-2020, 08:01 AM
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So I guess I jinxed myself.
Yesterday the Jeep was running a little funny.
I could feel what I thought was an intermittent miss.
No CEL. When I threw the scanner on her there was no pending codes either.
I have this little theory. So it is Winter and cold then you get a warm spell.
I figure some condensation builds up in the gas tank. So when this happens I throw some dry gas in.
Anyway that has been the weather around here for a bit.
So this morning I start the Jeep and oh yeah.
CEL flashing on and off, sound like it is running on 5 cylinders, etc.
CEL finally stays on and sure enough. P0304.
So I figure the Copper Tops have about 20K them. Which as we all know is really 40K.
So simplest thing first. Pulled the plug out of cylinder #4 and replaced.
Seems OK. Cleared the CEL and we shall see.
Should have replaced all the plugs last April when I pulled them to check. LOL.
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post #59 of 66 Old 01-03-2020, 09:08 AM
Michaelj51
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Originally Posted by Ralph77 View Post
Same here but only for a build date of after 1/20/00.




5 O2 sensors?
On behind the rear cat?
Total of 4, pre and post the two small CATs in the Y pipe....... Sorry Phat finger on the keyboard.
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post #60 of 66 Old 01-03-2020, 09:11 AM
Ralph77
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Total of 4, pre and post the two small CATs in the Y pipe....... Sorry Phat finger on the keyboard.
Whew.
Cause that would have been a new one to me. LOL.
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