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They almost always crack on the very front hold down ear. It is a poor design by Chrysler, and used ones are hard to come by. When torquing down the intake mounting bolts tighten them even, and a little at a time. 20ft lb is plenty on the front bolt. This is a problem in the 99-04 Grand Cherokee, and others using 4.0 engine.

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Q: What causes an intake manifold to crack 2003 Jeep Grand Cherokee?
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