I replaced the right cylinder head on 2002 jeep liberty 3.7. It also has new plugs, coil packs, cam sensor and ECU. Now the engine cranks but won't start. The dealership mechanic has no idea why it wont start. Please help.

What is your question?

replaced the right cylinder head on 2002 jeep liberty 3.7. It also has new plugs, coil packs, cam sensor and ECU. Now the engine cranks but won't start. The dealership mechanic has no idea why it wont start. Please help.