Engine swapped

[TCapps]

I just got a 2000 XJ and started cleaning it up and I noticed a sensor on the driver side on top of the engine. Turns out it's a temp sensor for the temp gauge. I haven't found out the year of the engine but I know that sensor is not in a 2000, so now I need to know if I need an aftermarket gauge to connect to it because there is no connect in the factory wiring harness. I just want to make sure my coolant temp it good because I don't believe my gauge is right currently.


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[4.3LXJ]

Sounds like someone has replaced the engine, or block anyway with one from an earlier year. The sensor was probably left in, otherwise there would be a large leak. So no, you don't have to worry about it. The 00 uses one sensor instead of two. As long as the ECM and your single sensor is working properly you shouldn't have any worries about it.

[TCapps]

Okay I thought so but I just wanted to make sure. It's my first jeep.

Thank you.


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[finneys98xj]

They may have just swapped the head. Post a pic of the top

[bluedragon436]

Yeah almost wondering if they didn't somehow end up with the "bad" head.. and replaced it with an earlier head.. maybe even one of the ones that everyone says is the much "better flowing" head..

[TCapps]

I will post a pic once I get back to the house.


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[MattybPDX]

Yeah almost wondering if they didn't somehow end up with the "bad" head.. and replaced it with an earlier head.. maybe even one of the ones that everyone says is the much "better flowing" head..
That's my thought. They probably got rid of the 0630 head to prevent a crack or because it all ready blew.

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[TCapps]

https://uploads.tapatalk-cdn.com/20170519/1f177e5ca2adf8ea2a8ab9e89aed1d10.jpghttps://uploads.tapatalk-cdn.com/20170519/fdedeec74dfee469ddff3ec7fb9f7ac5.jpghttps://uploads.tapatalk-cdn.com/20170519/9d8c74839164e0b59691bb8217599198.jpg

Here's the pics of my head, the sensor and I'm guess the number.


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[MattybPDX]

Sorry, I had that backwards, 0331 is the head you should have stock on your jeep. They are very prone to cracking and it's common for people to switch it out with the 0630. My research shows your 7120 is from a '91-'93 xj. I Can't personally answer your sensor question so I have to refer you to Google, although, I'm sure someone on here must know the answer.

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[TCapps]

Okay so that explains the sensor. Well that's good I won't have to worry about the 0331 than, good.


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[MattybPDX]

Since you have a 99+ intake with a 7120 head you'll get an extra little oomph. You can add a bored throttle body and new injectors to get some more kick on top of that.

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[TCapps]

Awesome. I'll add that to my list of stuff to do. Thanks.

Any idea on how to troubleshoot the e-fan? I'm going to take a multi meter to it just to make sure it's getting power but I don't believe it's working.


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[finneys98xj]

DO you have the split exhuast manifold or one single header

[TCapps]

I hate to say this but I'm not sure. How would I be able to tell?


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[MattybPDX]

Stock should be single exhaust header. Do you have 2? When looking at the down pipe from the manifold thereshould be 1 single pipe going down. Out you have 2 then that's aftermarket.

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[TCapps]

https://uploads.tapatalk-cdn.com/20170519/4064ecb89921aa427f3e8913a48fc3ae.png

I'm not able to go check right now but does this number help. I think it's 53010198


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[finneys98xj]

The split header has two collectors and pre cats. But the ports are a little different shaped than the head you have installed. most people that do this swap either use an adpater or they use the older one piece header. I dont see the adpater on your head is the reason i asked.

[TCapps]

That's something I need to look into then? Getting this adapter?

I'll be of better help tomorrow after work. I plan on spending some quality time with her this weekend and I think me wife's a lil jelly haha.


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[finneys98xj]

Stock should be single exhaust header. Do you have 2? When looking at the down pipe from the manifold thereshould be 1 single pipe going down. Out you have 2 then that's aftermarket.

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00 and 01 had a split header with 2 pre cats.

[MattybPDX]

00 and 01 had a split header with 2 pre cats.
That I did not know.

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[finneys98xj]

That's something I need to look into then? Getting this adapter?

I'll be of better help tomorrow after work. I plan on spending some quality time with her this weekend and I think me wife's a lil jelly haha.


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https://jeepexhaustadapter.com/

Go to that site and read and you'll see the adapter. If you have a single piece header you dont need this and you will be ok. the only time i see anything being a problem is if you have to do emissions testing like the communist state of cali.

[TCapps]

Well I'm in Texas. I know they have state inspections and I'm guessing they check emissions.


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[TCapps]

https://uploads.tapatalk-cdn.com/20170519/71712b608933fa05c694246a0ab38591.jpg

It does have the adapter


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[bluedragon436]

https://uploads.tapatalk-cdn.com/20170519/4064ecb89921aa427f3e8913a48fc3ae.png

I'm not able to go check right now but does this number help. I think it's 53010198

That'd be the PN to the stock rear portion of the stock 2 part exhaust manifold

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That I did not know.

Two piece manifold will look like this http://i.ebayimg.com/images/g/b4MAAOSwcBhWYMn4/s-l1600.jpg the one you referenced is the manifold to the right in the picture..

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https://jeepexhaustadapter.com/

Go to that site and read and you'll see the adapter. If you have a single piece header you dont need this and you will be ok. He'll either need the adapter or to go to the older single piece manifold, because the part number he referenced was for one of the two manifolds from the 2piece manifolds... the only time i see anything being a problem is if you have to do emissions testing like the communist state of cali.

[TCapps]

https://uploads.tapatalk-cdn.com/20170519/71712b608933fa05c694246a0ab38591.jpg

It does have the adapter


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It felt like there was some play on the bottom of the adapter. Idk if it's supposed to sit flush and tight?


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[finneys98xj]

https://uploads.tapatalk-cdn.com/20170519/71712b608933fa05c694246a0ab38591.jpg

It does have the adapter


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Sorry to say but the piece of metal with that little hole isnt the adapter that is the manifold gasket. and from the looks of it seems they tried sealing it up with rvt. YOu can clearly see in you orginal pics. That the manfolds are tight to the head and it doesnt have the adapter. If it isnt leaking you are fine it is just a small resiction in flow.

[TCapps]

Damn, well that good to know.


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[finneys98xj]

Also if that extra temp sensor bothers you just get a bolt and replace it. Thats what i did on my first xj when I put a 93 head on a 98.

[TCapps]

It doesn't. I was just making sure it didn't need it hooked up. It's been running hot. (Flushing cooling system Saturday) wasn't sure if my temp gauge wasn't working properly because if that not being connected but now I know it's just a plug and I'll just stay that way for now.


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[OldFaurt]

Good morning,
Most emission places in Texas will hook up to your OBDII port under your dash
the machine looks at pre catalytic O2 sensor and then the Post catalytic O2 and see
if the Catalytic converter is doing it's job. if that fails then they check with a visual.
so unless it's totally hosed up, it should be fine. at that year the old header for the 7120 head, (same as mine) does not have a bung (Threaded hole) for the PRE-O2 sensor. that is an easy weld job to fix. JEGS.com has them for about $10 and the wiring should exist. if it is not throwing a check engine light it should be right.
Hope that helps, and by the by, the 7120 head is a lot more robust than the 0630... I got dirty pictures, the 0630 is a dirty little head. damnedest thing is it ran great... right up until it didn't.
Good morning to you all,