[2000 XK8] everthing replaced

Hey everyone, the name is Ken [2000 XK8/X100/AJ27], and over the last year I’ve basically become a master Jag mechanic… THE HARD WAY. However, I’m now at the end of my rope.

here is what I’ve replaced/fixed in the last 30 days

  1. Both Heads were worked over and machined, and New Head Gaskets
  2. Timing Chains and Tensioners (primary and secondary)
  3. All 8 Coils, and All 8 Plugs
  4. Radiator and Hoses
  5. Primary Overflow Reservoir
  6. Thermostat Housing Tower (aluminum upgrade) and Thermostat
  7. Water Pump
  8. 3 Oil Flushes and new Filters in the last 7 days
  9. 2 Complete Coolant Flushes in the last 7 days
  10. 8 Valves on the Bank 1 intake were bent and replaced (stems were all grinded and polished to match the resurfacing of the heads
  11. Oil Pain and Oil Sump Strainer, completely cleaned out
  12. Set Timing and Checked Timing no less than 4 different Times (AJ27 = VVT)
  13. All 32 Valve Guides
  14. Upstream Bank 2 O2 Sensor

AS A SIDE NOTE THE CHECK ENGINE LIGHT IS NOT ON

AS A SECOND SIDE NOTE, I’M GONNA WATERBOARD THE FIRST PERSON TO SAY ITS A WEAK BATTERY

The result of all the work I’ve done on this vehicle has yielded a car that performs poorly and runs 15 degrees HOTTER (10 minute idle at any ambient temp, Engine compartment feels like its literally on fire) than it ever has in the year that I’ve owned it. Sensor reads temp at 208-210 and my on-board OBD-II monitor confirms the temps. It’s like the car is consuming itself from the inside and I cant stop it.

Any advice minus the aforementioned weak battery nonsense would be GREATLY appreciated, for I am now at the point of my Jaguar ownership where I’m ready to harm the car (on purpose) just to feel better for the time/work and money I’ve dumped into this seemingly bottomless pit

Welcome to the forum, not sure why you would think overheating would be caused by a weak battery?
With the work that has been performed the first thing that comes to mind is whether the engine was in the correct position as far as timing is concerned. I believe these engines are NOT timed at TDC but at some other position?