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Pull the valve cover and see if any valve springs are damaged/broken. 0 psi makes me think open valves. Also you can check valve rockers and push rods at the same time.
The other 2 are also way below spec, 80 psi is also no good. The spec is 175 psi for the 4.0, and probably the same for 2.5 L.
But since all 4 are way below spec, it sure sounds like a bad head gasket.
The other 2 are also way below spec, 80 psi is also no good. The spec is 175 psi for the 4.0, and probably the same for 2.5 L.
But since all 4 are way below spec, it sure sounds like a bad head gasket.