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Unread 07-22-2013, 09:44 AM   #1
mracer71
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TJ motor4.0L into YJ - what do i need to know?

Hi all! I got a chance at getting a 97 4.0L to replace the 4.0 in my YJ. I don't think it's a direct exchange, or is it? What do I need to know?
Thanks for your help!

Max.

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Unread 07-22-2013, 09:47 AM   #2
Randonexplosion
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At the very least, you will need the computer and wiring harness from the TJ 4.0
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Unread 07-22-2013, 01:41 PM   #3
Siva283
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What I am told is the engine is the same for the most part. You can hook all your sensors up to it. Your intake and exhaust manifold and you will need to plug one temp sensor hole on the back of the head. You keep your current wiring and harness and keep it OBD1 that way you do not have to go through a nightmare swap to be OBD2. You would also use your alt and accessories on it.
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1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 07-22-2013, 02:03 PM   #4
Randonexplosion
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Quote:
Originally Posted by Siva283 View Post
What I am told is the engine is the same for the most part. You can hook all your sensors up to it. Your intake and exhaust manifold and you will need to plug one temp sensor hole on the back of the head. You keep your current wiring and harness and keep it OBD1 that way you do not have to go through a nightmare swap to be OBD2. You would also use your alt and accessories on it.
I did not know that. I will shut my mouth now
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Unread 07-22-2013, 02:11 PM   #5
Siva283
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Quote:
Originally Posted by Randonexplosion View Post
I did not know that. I will shut my mouth now
I thought the same thing you did until I got schooled. I have a 99 4.0 waiting for my 4 banger to blow up to go in. I will still use my existing harness. I will add 2 injector wires and change the PCM then I will have that 1 hole to plug. Obviously I will need a new trans and such but as far as the engine goes it is pretty easy.
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1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 07-22-2013, 02:31 PM   #6
Randonexplosion
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Awesome man!

Hope this helps you OP.
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Unread 07-22-2013, 03:46 PM   #7
shaneo318
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Siva283 is right on. I have a 99 4.0 in my 91. Also remove the stuff where the coil pack stuff goes and install your distributor. Mine was from a Grand Cherokee, so I had to remove an additional idler pulley. Mine is a 5 speed so I had to get a pilot bearing too. I just left the sensor in the rear of the head and didn't hook it up.
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Unread 07-22-2013, 10:46 PM   #8
kaitlynsdad
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i put a 2000 model 4.0 and tranny and transfer case from a Cherokee in my 1992 yj the problem i got now is that my 1992 yj 2.5 had a return fuel line and the newer 4.0 does not have a return fuel line so i think i need a tank and sending unit from a 2000 tj i dont think a Cherokee tank will fit between the springs just something to keep in mind tho
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Unread 07-22-2013, 10:56 PM   #9
Randonexplosion
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Will an older style fuel rail with a return line fit on the newer 4.0? Thats what guys do with Vortec swaps do. Mine already had the correct fuel rail. Just an idea.
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Unread 07-23-2013, 05:22 AM   #10
Siva283
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Quote:
Originally Posted by kaitlynsdad View Post
i put a 2000 model 4.0 and tranny and transfer case from a Cherokee in my 1992 yj the problem i got now is that my 1992 yj 2.5 had a return fuel line and the newer 4.0 does not have a return fuel line so i think i need a tank and sending unit from a 2000 tj i dont think a Cherokee tank will fit between the springs just something to keep in mind tho
If you are keeping it OBD1 you put your intake and exhaust manifolds on it. Your fuel rail will stay in your intake. Problem solved.
__________________
1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 07-23-2013, 03:11 PM   #11
shaneo318
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I just used my old fuel rail with the return line.
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