what year model 4.0 to use for a swap - JeepForum.com
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post #1 of 37 Old 03-03-2019, 08:05 PM Thread Starter
Mrflyingdonut
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what year model 4.0 to use for a swap

Going to swap my 258 for a 4.0, Should i go with a 92-95 year model or a 96-98. Is there a difference?

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post #2 of 37 Old 03-03-2019, 08:13 PM
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Do you want an OBDl or OBDll? Most people seem to say the OBDl is easier. I went with a 95.

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post #3 of 37 Old 03-03-2019, 08:18 PM Thread Starter
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Do you want an OBDl or OBDll? Most people seem to say the OBDl is easier. I went with a 95.

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I have no Idea, I still haven't decided if i'm going to a pull a part and find an intake with the fuel injection parts, or use my 258 intake with a fitech or sniper
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post #4 of 37 Old 03-03-2019, 09:01 PM
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I've noticed that you have several threads going on your engine swap topic. To answer your question about the differences between 92 to 95 and 96 to 98 4.0s is that 92 to 95 is OBDl which has one O2 sensor and 96 to 98 is OBDll which has two O2 sensors. Back when I was doing this swap everyone had an easier time with the OBDl swap because of the single O2 sensor and this swap had been done and there was more info out there to help in doing the swap. I have since seen more swaps using the OBDll 4.0, and even guys using the grand charokee 4.0. There used to be something about the computer from the grand charokee having vehicle anti theft issues that could not be bypassed. There is info out there on these different swaps. Go to Google and type in 4.0 swap and will pull up tons of stuff you can read and educate yourself on the different swaps being done with the 4.0. This will help you with your decision on keeping your 258 or swapping in a 4.0. I can't help with deciding about the V8 swap. Heck I would like to do the LS swap myself, but money is an object for my wife and kids right now.

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Dana 30/Model 20 with 4.10 gears
33/12.50/15 BFG's
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post #5 of 37 Old 03-03-2019, 10:35 PM
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You will get the best out of the 4.0 swap (engine or just the head) by controlling fuel and spark, the sniperefi etc will only control fuel as far as I am aware. The thought of doing all that work for fuelling and still having a vacuum and mechanical controlled dizzie would be .........

The MOPAR years from 92 have more support than the Renix era. Most seem to go with the pre-distributorless coil pack engines, whcih leaves you with 92 to 98. At heart the swap is the same in any of those years, take all the plumbing and electrics that came with the engine and lay it into the CJ and hook it up. They all need a fuel system mod to the CJ.
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post #6 of 37 Old 03-04-2019, 12:51 PM
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There's more differences between OBDI and OBDII than just the number of oxygen sensors. Regulated return on the fuel is one, distributorless ignition is another (year dependant of OBDII), etc.
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post #7 of 37 Old 03-04-2019, 12:56 PM
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Quote:
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There's more differences between OBDI and OBDII than just the number of oxygen sensors. Regulated return on the fuel is one, distributorless ignition is another (year dependant of OBDII), etc.
also motor mounts depending on year of the block

Told my girl I just had to forget her, Rather buy me a new cartburettor,
So she made tracks sayin' ths is the end now, Cars don't talk back they're just four wheeled friends now
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post #8 of 37 Old 03-04-2019, 01:36 PM Thread Starter
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You will get the best out of the 4.0 swap (engine or just the head) by controlling fuel and spark, the sniperefi etc will only control fuel as far as I am aware. The thought of doing all that work for fuelling and still having a vacuum and mechanical controlled dizzie would be .........

The MOPAR years from 92 have more support than the Renix era. Most seem to go with the pre-distributorless coil pack engines, whcih leaves you with 92 to 98. At heart the swap is the same in any of those years, take all the plumbing and electrics that came with the engine and lay it into the CJ and hook it up. They all need a fuel system mod to the CJ.
The Holley sniper and fitech both have ignition timing, (same thing as spark control?) Would a set up like this be similar performance to the original mpi setup

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post #9 of 37 Old 03-04-2019, 03:47 PM
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Originally Posted by BagusJeep View Post
You will get the best out of the 4.0 swap (engine or just the head) by controlling fuel and spark, the sniperefi etc will only control fuel as far as I am aware. The thought of doing all that work for fuelling and still having a vacuum and mechanical controlled dizzie would be .........

Wait, what? You'll get the most out of a 4.0 swap by leaving it alone and swapping it in as it left the donor vehicle. It already controls fuel and spark from the factory.

I'm not sure how sniperefi and 4.0 swap were mentioned in the same sentence and/or reference. There's no need for aftermarket EFI systems if you're swapping in a 4.0.
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post #10 of 37 Old 03-04-2019, 03:59 PM Thread Starter
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Wait, what? You'll get the most out of a 4.0 swap by leaving it alone and swapping it in as it left the donor vehicle. It already controls fuel and spark from the factory.



I'm not sure how sniperefi and 4.0 swap were mentioned in the same sentence and/or reference. There's no need for aftermarket EFI systems if you're swapping in a 4.0.
It's just the engine I got doesn't have the fuel injection system with it, so I was wondering if I should find one in a junk yard or order a sniper

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post #11 of 37 Old 03-04-2019, 04:00 PM
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Junkyard would be cheaper.

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Dana 30/Model 20 with 4.10 gears
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post #12 of 37 Old 03-04-2019, 04:03 PM Thread Starter
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Junkyard would be cheaper.

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What are all the parts I'll need to pull? Manifold with throttle body and computer, is that all?

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post #13 of 37 Old 03-04-2019, 04:32 PM
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I would get everything that you don't have on the 4.0 you have now. Check the exhaust manifold for any cracks where all the pipes come together. I would grab the fuel lines back as far to fuel tank as you can, and the wiring harness, PDC relay box and computer. I also got some brackets from a 94 grand charokee for accessories and to center up the fan.
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1983 CJ7
Sherwood Green Metallic/Nutmeg Interior
4.0 I6
T-5/Dana 300
Dana 30/Model 20 with 4.10 gears
33/12.50/15 BFG's
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post #14 of 37 Old 03-05-2019, 08:05 AM Thread Starter
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I would get everything that you don't have on the 4.0 you have now. Check the exhaust manifold for any cracks where all the pipes come together. I would grab the fuel lines back as far to fuel tank as you can, and the wiring harness, PDC relay box and computer. I also got some brackets from a 94 grand charokee for accessories and to center up the fan.
Going to head to pull a part some time this week and see what I can find

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post #15 of 37 Old 03-05-2019, 01:25 PM
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It's just the engine I got doesn't have the fuel injection system with it, so I was wondering if I should find one in a junk yard or order a sniper
I get that, however it really has nothing to do with my questions/comments directed at Bagus Jeep. If you get a 4.0 out of the junkyard it is already EFI. He was talking about using aftermarket EFI on a 4.0. At least that's how I read his comment, since he mentioned both in the same sentence in reference to each other and fuel only vs fuel and spark.

What I said would be irrelevant if he was addressing a partial 4.0 you already have, but I saw no mention of such a thing.
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