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I recently experienced this same problem. I finally had it properly diagnosed as a broken skirt on the number 6 cylinder. I replaced the engine because it seemed to be the least expensive way to solve the problem. I was out about $1500, but was worth it in the long run. I kept the original engine and am planning on rebuilding it someday soon to have a replacement in the future of sell it to recoup some of my money. Hope this helps. Dean

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Q: You hear knock in engine Jeep Grand Cherokee what can be wrong?
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