The engine knocks and is most noticeable when warm and idling. The knock sounds like it's coming from the lower part of the engine.
SOURCE: 2000 jeep cherokee engine knock additional info
This could be a piston rod or, crank shaft issue considering the location of the sound.
SOURCE: engine knocking noise in 2000 saab 9-3 SE?
It's a common problem with these cars i am actually fixing mine as of now. That car is all about oil pressure and when it is low you'll start to get a tap and or what sounds like a knock due to the lifters not having enough pressure. Try taking your oil pan off and check your oil pick up line going from the oil pan to the turbo. A lot of times it gets a lot of sludge build up and makes the pressure little to none. If that looks clear check the slump inside the oil pan and see if that has sludge build up. Well hope this helped
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