Question about 2002 Jeep Liberty

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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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  • 1SickWS6 Jun 25, 2009

    I have a 2002 jeep liberty 3.7L and want to put a 2004 Jeep Liberty 3.7L engine in it, but they have different crank reluctor wheels and possibly cam reluctor wheels therefore the tune will be off and it will not start with the 2002 PCM. I am wondering if I also swap in a 2004 PCM if it will fire up? I would imagine the wiring harnesses would be the same, but am not sure...

  • Richard Scordino May 11, 2010

    Never trust the wiring harnesses...I have five different diagrams and none of them match my jeep.

  • yadayada
    yadayada May 11, 2010

    try our live chat

  • skudoman
    skudoman Feb 10, 2013 thinking of doing this take a look at this video and make life easy.

  • Michelle Holden Jul 27, 2013

    Can the reluctor gear be changed from a 12 tooth to a 31 tooth?


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Has anyone made this work yet? I have the same problem 2002 jeep 3.7 and just installed a 04 motor. Timing is off. Some one had a good idea of mounting the crank gear to the out side of the harmonic ballancer and mounting the sensor with a bracket. What about the cam gear on the left side. Does the timing cahain have to come off to remove it? Or has any one swaped the wiring harnest, and computer.
Please email me back. Thanks for your help.

Posted on Apr 21, 2012

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I have just done that engine swap - check my recent post as now the engine turns but wont start - Jeep dealer says -04 engine part numbers on the 3.7 Liberty are the same as the 02-04 Dodge 1500 3.7 - which engine was easier to find & cheaper than the Liberty. I bought the 04 & switched out all of the sensors off my 02 except the crank sensor. That may be why it wont start - I called the parts store & they said the sensor was different. I will let you know how it works out - I will be working on it tomorrow..

Posted on Jun 28, 2009

  • ad4le Jul 01, 2009

    Stick with the 02-03 engine - I am swapping it back out - the one cam gear between the 02-03 & 04 on the right side ARE different - block & crank & left cam gear are the same but because of the difference on the electromagnetic vs. plain right gear, it's too much work for me to go through the engine to bother with it. I'm not going to swap computers, wiring - etc.

  • Michelle Holden Jul 27, 2013

    Can you change the reluctor gear?


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I build a 2002 3.7 engine in a2004 jeep.the car will not start. take it out again and chahge the crank gaer and the cam gear.the car start running very good,but they took out the 2004 cats out and i build the 2002 cats in,but my engine light still on.they show me the 2 codes,420 and 430.

Posted on Apr 08, 2012

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There are also different camshafts, different valve springs, engine will have different emission profile, but in range of adaptation I think.
If you want to have exact this same profile, You should move also camshafts and springs to newer one.
You have to change right cam gear, crankshaft reluctor, intake, probably oil smoke and pan (depends of what model engine is), all sensors. There is also ring in back of crankshaft whitch will block putting 2002 transmission converter, you need to have special tool to remove it. This says that it's lot od work, what we are doing now, nearly all new engine disassembled... in few days we'll try to fire engine, let's see...

ad4le - is Your finally running?


Posted on Feb 24, 2010

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  • caniggia Mar 03, 2010

    swap completed with success as described. fuel corrections are in the limit 10% (available limit 25%), runnig better than old one.

  • ERIC Oct 15, 2011

    Did you just change right cam gear, crankshaft reluctor, intake, all sensors, ring in back of crankshaft which will block putting 2002 transmission converter? I have an 2002 Jeep liberty and a 2004 motor. Is the crankshaft reluctor part of the crank? Thanks

  • Michelle Holden Jul 27, 2013

    I a looking to buy a 2004 3.7 motor to put in an 2004. Has anybody done this or does anyone know how to do this? I know the cam gear and crankshaft reluctor are different and I'm gonna have entire 2004 truck. Does anyone know, instead of changing everything on the engine, can you just change the computer?


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Do not use the 04 motor, I am going thru this right now, the crank is the same but the reluctor gear is different and even though you've changed the cam gear, it will not start.

Posted on Oct 26, 2009

  • biker280 Nov 01, 2009

    Also, forgot to mention, the intake on the 04 is missing the intake temp sensor, not a big deal but you have to swap intakes.

    The computer will not swap as its totally different. I am pulling out the 04 motor and putting a low mileage 02 motor in, what a cluster ****, :(

  • cheeno66 May 26, 2010

    would an 05 3.7 work on an 04 jeep liberty blown 3.7?


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I want to change a 3.7 motor off of 2004 jeep Liberty 2wd in order to fit my 2002 jeep liberty 4wd?

engine swaps are complex as is mixing engines to wrong transmissions.
so both are 3.7L, is that it?
you never said what exacty didnt fit.
the flex plate to TC
or TC to A/T pump side mismatch.
if its the flex then get the correct flex plate.
or call jeep parts? ask them for the right parts
the side of the trans has the trans part number
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Is there ANY other engine that will fit in a 2002 jeep liberty limited? 3.7L v6... need a whole new engine

3.7L EKG Powertec, engine. SOHC with roller followers,
did you check compression, or just P030x codes???????
and what if its just a stuck valve or collapsed lifter
why not ask for help in diagnosis?
compression bad? on one or more? cylinders, post #
pull the Valve covers, see if there are broken valve springs
or bad cam lobes, or lifter bad? (motion)
if it didnt burn oil , try rebuilt heads.?

ran for 12 years, so what is the mileage>? 300k?
Oil changes, at 5000 ?

the 3.7 may fit...says wiki.
warning, some engine blocks may NOT be same. (filter mounts, engine mounts) check first.
but you can find this at any engine builders web site. (google them)
ive swapped many and engine, even wrong engines.?grin
there are always choices, i always have and had spare cars.
so down time is never an issue for me.
but others yes. (rent a car is one option while fixing another)
1: if the block is bad get a short block.
2: if the heads are bad get yours rebuilt , or exchanged.
3: if you blew the engine to total destruction, pistons hit valves? (rare)
then get a used engine, or buy a rebuilt.
or pull yours and take it to any top machine shop and drop it off.
bingo, fixed and cheap too. no middle man, to rip you.

The 3.7 liter PowerTech V-6 engine is, essentially, the 4.7 V-8 with two fewer cylinders.
then later, morphed to the Pentastar V6. (today's motor)
cast iron block, (lasts long time, easy to bore and rebuild)
no rubberband cam belts, real chain, drive.
2 valves per cyl. making head rebuilds fast and cheaper.
forged pistons, not cheap cast.
MOPAR is not POS.
ask engineer Brian Crothers

I run the 3.8L in my 08 JK.
its a real low tech, push rod motor. (ended in 2011)

id fix mine, if it failed
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God bless you

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2002 Liberty.? KJ car. (USA)
ever seen a real FSM? "factory service manual"
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here it is , read it, then ask questions?

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