Question about 2002 Jeep Liberty

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Replaced 02 Jeep Liberty 3.7 engine with 04 Ram 3.7 - won't start

The engine seized up in my 02 Liberty 3.7- no replacements were available at the salvage yards for 02 -03 - I called Jeep parts & they told me that the 04 Dodge Ram 3.7 was the same part number - same block from 02-04 on both Liberty & Ram so we located a 3.7 Ram 1500 engine & put it in. Put most of my original sensors from the 02 on it & it wont start. Turns over but wont start. Didn't change the crank sensor yet. Will try that next. Could the computer need reprogramming? Any suggestions??

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  • ad4le Jun 28, 2009

    ps. I may have solved my own problem - I called the parts store & the crank sensor from 02 & 04 are different part numbers so tomorrow I will put my 02 original crank sensor into the engine & hope that solves the problem.......

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: 2000 jeep cherokee starts then stalls in approx 3 sec 4.0 has new crank sensor

I am going to assume that it will not run even if you push on the accelerator pedal?
Can you install or attach an old timing light to the spark plug wires, turn it one and try to start it. The light should flash with the engine running, but if it shuts off at time of engine die, and the engine is still spinning, you are losing spark, My suggestion is the cranks shaft sensor on bell housing.
Second, install a pressure gage on the test port on the fuel rail and watch it as you start the engine, fuel pressure should not drop as the engine dies, if it does, the pump is not working correctly. There are two modes of power to that pump, one to start and timed, for only a few seconds to prime the system, and one to run continuously. Find the wires going to the pump at the tank. Connect test light to those wires and watch what happens during crank and at stall, You should not have the pump shut off and the engine dies.
If you have spark, and fuel pump working, when did you last change the filter,,but I put that LAST.
It has to be one or the other of these.
Good Luck

Posted on Aug 04, 2008

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  • 1 Answer

SOURCE: Jeep GCL Backfires Stalls

Aaron, I had the same problem. It is the most expensive part of course the computer. I replaced everything as well till I replaced it. They are remanufactured and have had problems with them as well. I am on my third one now at 200k miles. Oh and by the way it does not show up on the diagnostic check. Good luck

Frank

Posted on Dec 01, 2008

  • 1 Answer

SOURCE: 1993 jeep grand cherokee will not start

Check to see it maybe a head gasket .mine was

Posted on Feb 28, 2009

csmock132
  • 4669 Answers

SOURCE: 2003 3.7 Liberty check engine light for crank sensor

2003 3.7 Liberty check engine light for crank....what? sensor? You have scanned it?

Posted on Mar 06, 2009

  • 295 Answers

SOURCE: Solving the following Error Codes

The codes you have metion is for fuel injection miss fires. and lean condition . These codes most likely mean you need to start with a tune up , and fuel injection cleaning . The oxygen sensor are very common problem with the po171,po174 code. The other common problem with the codes after a tune up is done is the intake manifold gasket is leaking .
I would take the vehicle in to a mechanic for a tune up and then demand the mechanic clears all the codes . You can take the vehicle back and drive it for a few weeks. IF the codes come back then have the vehicle recheck for the oxygen sensors or intake gaskets .

Posted on Apr 30, 2009

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I put a 02 jeep liberty 3.7 motor in my 04 dodge pickup and it will not run right


So, now you are BEGINNING to understand WHY it is against FEDERAL LAW to perform such an engine change.

You might want to download and read the following PDF file published by the Environmental Protection Agency (EPA)

http://www.epa.gov/compliance/resources/policies/civil/caa/mobile/engswitch.pdf

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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. pcardoso@cogeco.ca Thanks for your help.

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