Liberty Jeep 2002 at what milage do I change the timing belt?

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
my guess is all you need is the correct flex plate for engine to TC.

Now this depends on the climate and mileage if you live in a dry hot climate then around 6/7 years or around the 80K miles ,but if you live in a more temperate climate then around 10 yrs or 100,000miles

not one symptom posted!
nor engine option size?
double failure.

every year the motor had different parts and timing was moved. try and take parts off the old motor. like the fuel rail and the sensors

How do you know the pressure is fine? What is the pressure? Either the engine is bad, or the oil pressure sender is lying, you need to know ASAP.

If the radio works, but the display doesn't the bulb is burned out, I think removing the radio is necessary to replace it. I would see it as an excellent opportunity to upgrade sound systems and go with an aftermarket unit that will interface with your Ipod.

I’m happy to assist further over the phone at https://www.6ya.com/expert/gregg_78ecbb34e27be215

Here is a website that a free manual can be down loaded for your vehicle


http://ezinearticles.com/?Find-the-Free-Auto-Repair-Manual-You-Need-Online&id=92717

I suggest check in the Jeep-KJ-2002-Liberty-Service-Manual-PDF-Secc-08-Electrical-Systems and page 487 and next for FUSES.

Also here you have the Jeep-KJ-2003-Liberty-Service-Manual complete with all sections.

Hope this help to solve your problem (remember rated this).

Hello there, Id say the EGR system has an issue. Have you been noticing decreased fuel milage prior to the rough running? Do you have a code scanner by chance? Autozone and Checker auto provide a free code scan , and that should place you in the right direction. Thank you , Quinn Texada

Typically you would loosen the mounting bracket on the alternator so that the alternator moves inward and releases tension on the serpentine belt. I found a video that might be of interest to you...
http://www.wonderhowto.com/how-to/video/how-to-change-a-serpentine-belt-on-your-car-39904_6/
Best of luck...