I think i know whats going on here. Something probably happened with either the old head or cats and since it was in a non emmisions area the previous owner probably just decided to remove the cats or put on a pre 2000 head. And because of that they were left with 2 extra o2 sensors that they just stuck where ever they could find a place for them. I bet you wont pass emmisions until the exhaust converted back to factory with the pre cats and all that junk

 

x 2 ....After you posted this I went back and took a good look at Mrtowers pictures...There's definitely something messed up with that setup in the 3rd pic.

 

flinstone, thanks that helps! i might have to end up doing that. as to putting the time in to move the cat? not a biggie i've got access to a lift and welder.

i found that in 01' they had two models, one with cali emissions and the other for the 'normal' federal regs. the cali model is the one with the dual pre-cats and 4 sensors.

also did more digging around under the hood and found clues that suggest to the motor being out of and older year. the block, head and exhaust manifold. looks like a 01' intake to me tho.. its a frankenstien jeep lol

@salad - TBH? three sensors? cuz thats what its looking like to me. i dont see any other open plugs up front. is the only difference in the harness or is there a label somewhere that would tell me?

 

False...My 2001 has 4 sensors and has never been near California...It was made for shipment to to CT...

 

they were designed to pass californias emssions standards, not that they are from califronia. did it have the mini cats too? salad said something about a TBH that has 3 sensors up front and one before the muffler.. which kinda looks like what mine is SUPPOSSED to be set up as..?

 

My 2000 Sport has 4 sensors also. I don't know where it was meant to be sold, but it was sold new in New Jersey.

They are located before and after both mini cats. There are NOT any sensors around the cat in front of the muffler.

 

I don't think vehicles are made to meet CA emission standards unless they are being shipped to CA.

Regardless...Yes I have 4 sensors and 2 mini cats, just like in the picture I posted. Never heard of an XJ having 3 sensors...2 or 4....'Course they way they screwed around changing these engines it wouldn't surprise me...

In the 3rd picture you posted it looks like there is 1 sensor mounted about 2-3 inches away from another one....it doesn't make sense to me.

 

i know.. its perplexing me and everyone else i guess. do you have pictures of your harness leading to the two pre cats and the two post cats? that would be a great reference point

 

I wonder if you shouldn't phone a dealer and tell them you need to know what the heck they had to install on the thing to sell it. It doesn't seem unreasonable that they could supply you with that info over the phone, being it's a "legal" issue. Have the Vin & date of course.

I'd say the clues would be in the harness, or the diagram for it, but which diagram?

 

The 4 sensor system was designed to meet Calif standards. Fed standards were getting tighter. They sent some to other states as well, then it became standard for all states. It's made lots of confusion, and internet yo yo's without a clue have made it worse!

The quick way to tell - does it have a distributor - 2 sensor type,
--- or a coil rail - 4 sensor type?

As far as I know NONE were made with 3 sensors.

BTW - The computers, ignition systems, Crank and Cam sensors, and wiring harnesses,are different between the 2 and 4 sensor types. You cannot interchange them.

As far as smog goes, the smog station will hook up his machine to the ALDL - it will read wrong in relation to the entered VIN - Automatic FAIL
When changing engine years, ALL aspects must be considered. It's possible in Calif to get a waiver, but it's not easy.

Someone got creative and mickey moused it. It's going to be expensive to put it right.
Check your laws - the seller is responsible for it being in stock form, no matter what state it was or is in - FED LAW!
You may be able to get your money back or get the seller to pay for putting it right.

Start by asking at your local smog station - they will tell you what agency to to see about it. The smog station can also tell you what it's supposed to have - based on the VIN.

You might be able to sell it to someone in one of the backwards states that don't check smog, but it's still a violation of FED laws.
As time goes on, those laws will eventually catch up with it.

 

i bought it private party on an 'as-is' basis, so i kinda screwed myself there..

so my year should be the 4 sensor type regardless?

and if so, since there are two pre and two post, would it not be possible to get a new manifold for the year the motor is and weld in an extra bung for the second pre cat sensor? then do the same for the post?

 

+1 to everything rrich said

Sure you could weld that together with that pic as a reference. I'd probably see if some 2000+s are out at some boneyards first... though my local one doesn't have anything newer than 95 :|

"TBH" = "To Be Honest" Internets lingo. I realized there are 4 sensors, just thought the layout was different since I didn't understand what the pre-cats actually did. First time I've commented on the 4 cat system out in public since I wasn't sure so it's not me spreading bad info.

 

hahah i totally realized that after all those comments.. lol

i just crawled underneath my neighbors for a tangible comparision but it was a grand cherokee, same engine and exhaust as mine is.. suppossed to be

but thhe plugs for the o2 wiring are different, on the xj are they color coded like black for pre and grey for post? or is it black for bank one and grey for bank two?

and speaking of salvage yard, does the 01 manifold fit up to the 96' (example year) block? ive been seaching the web to purchase one but they seem year specific with the new ones

 

I'd start with the VIN - to see what is supposed to be in there. It may be simple putting it back, or super complicated - PCM, wiring, sensors, ignition, etc.

'01 I'm very sure it's supposed to have the 4 sensor system and DIS ignition - but check! Don't go by the color of connectors, they used all kinds of colors. Look close - you may find a paper part number tag on the harness somewhere.

Who knows how much he swapped to make it work.

The exhaust manifolds will interchange from the early 4.0 to the very late ones. There's a slight differences, and the downpipe is in a slightly different position - close, but needs modification (muffler shop can help with that.)
But they all fit the head. The newer ones have a bellows between the cylinders to help prevent cracking. If it's an older head with a newer manifold, you may have to do a little porting to match the ports better (grind the manifold, not the head,) but I doubt you will on yours - too new.

Look on ebay - you can see pictures of the manifolds with the bellows. They run about $100, it's a good upgrade anyway. Then all you need is the dual cat system. It's a one piece part, factory welded together. Some places sell just the parts and you weld them yourself - they don't last long. Dealers get about $700 for the assembly, but you can find them cheaper from aftermarket Jeep parts houses - but still $500 or so. Not sure if the big cat is the same.

If you are lucky, you already have the right wiring, ignition, sensors and PCM - then all you need is the manifold and dual cat assembly.

Not lucky === $$$$$$$$$$$$? It might even be better to get the proper year motor with PCM, harness etc and swap it in.
But check first - check the number on the PCM - he may have only swapped that out.

I HATE BUTCHERS!

Some dealers may "adopt you" and really help you with discounts, help, advice, and even parts they replaced under warranty when they didn't need to.. etc. They are just people. My dealer has been a great help sometimes.

Signing AS IS does not include smog equipment. Fed and state laws make that very clear. IT HAS TO COMPLY TO LICENSE IT. The ONLY out is if it clearly states it's intended for OFF ROAD USE ONLY.

You still haven't told us if you have a distributor and plug wires or a DIS coil rail. That will give us a big clue!

You have an interesting restoration project going, please keep us informed as you go along. Best place is on this thread.

You are showing WHY it's a good idea to have a qualified Jeep shop look at it BEFORE YOU BUY, AND have it smogged by the previous owner before paying him - the law says he's responsible to make it pass smog when he sells it. If thy balk, get suspicious.

AS IS is not a loophole. Paint, seats etc yes, emission controls no.

I have an '03 Rubicon, and a 95 Cherokee - same engines, but different equipment. (Had 3 Renix's, sold them.) Still have a few pre-smog older ones too.
Before I sell anything, I make sure it passes smog fine. If everyone did that, life would be so much simpler!!!!!!!!!

 

Manifold with bellows:

http://www.ebay.com/itm/New-Exhaust-...fe8d7c&vxp=mtr


Dual cat assembly - probably not the right one for you - see the sensor bungs?

http://www.ebay.com/itm/Magnaflow-50...71eda0&vxp=mtr