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Unread 06-25-2009, 10:45 AM   #1
1SickWS6
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2002 Jeep Liberty 3.7L Engine Swap to newer 2004 engine

Okay, this is driving me nuts! I have a 2002 Jeep liberty with a blown 3.7L engine. I am going to replace it, but am having trouble finding a 02/03 engine around here locally. I find plenty of 04/05/06 3.7 engines and was wondering if I would be able to drop one of those in? I understand they have different crank reluctor wheels and possibly cam reluctor wheels. I was thinking of putting a 04 engine in and then also swap my PCM for a newer 2004 PCM with the later engine tune that should be calibrated for the 04 engine. Does anyone have any knowledge if this should work? I would expect the wiring harnesses to be the same between the 02 and 04 engines and would think everything would just bolt right up and fire up. Any input would be greatly appreciated, thanks!

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Unread 06-26-2009, 05:12 PM   #2
iluvtruenos
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Basically, all engines are mechanically identical (Your 1976 Chevy 350 V8 and 1999 Toyota Corolla I4 all work the same) You can do it, but you must make both motors identical, this may include swapping sensors, tone rings, and other stuff like that.

It can be done though.
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Unread 07-01-2009, 06:51 PM   #3
nubby
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DONT DO IT..................i tried an 04 3.7 in an 03 liberty.....after a month still trying to figure out how to make it work........
for example, had to swap the crankshaft, all sensors, injectors and it still doesnt run right. and modifying the pcm info doesnt work right either
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Unread 07-01-2009, 10:54 PM   #4
iluvtruenos
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Ohh! The dreaded tone ring issue. 1999-2001 4.7 V8's had 16 teeth tone rings, and 2002-2004 had 32.

I hear your pain.

Just swap those two out, and use all the old electronics.
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Rampant Pack of Retards group president.
2000 WJ, 4.5l, AX15, 242 D60/14b, 5.5" lift front, 7.5" rear. Ford Expedition rear coils, Ram 350 shocks, JKS, IRO Long Arms, cool Badlands flag thingy.
1987 XJ - Gone but not forgotten
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Unread 08-09-2012, 10:31 PM   #5
old45b
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Easy fix

This is actually an easy fix.

When you change out to a newer motor, you have to do a few things to make it work.

1.Change the reluctor to the original one from your vehicle.
2.Change the cam sensor to the original one.
3. make and install an egr block off plate if yours did not have one.
4. Use the original instake and connectors if different.

I did this to my 2003 Liberty to a 2007 motor and it worked perfectly.
Drives like a new car and I now have 2000+ miles on my swap.

Good luck and good driving. You will enjoy your Liberty.
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Unread 01-14-2013, 06:14 PM   #6
tommxxx
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hi i am also looking to put a 2004 3.7 Liberty motor in my 2002 Liberty it is also a 3.7 so all i need to do Change the reluctor,cam sensor, install an egr block off plate original one from the 02.
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Unread 04-09-2013, 11:07 AM   #7
Griff1918
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Now how involved is this swap? Do I have to pull the crank shaft to do the swap?
Because if it is super involved I just get a remaned engine and have all new inners.
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Unread 04-09-2013, 11:16 AM   #8
tjkj2002
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Quote:
Originally Posted by Griff1918 View Post
Now how involved is this swap? Do I have to pull the crank shaft to do the swap?
Because if it is super involved I just get a remaned engine and have all new inners.
You will have to pull tha oil pan off and the valve covers,not 100% sure if the crank has to be removed though.It's a pretty involved job,not hard just takes some time.
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