naki_k wrote:It also didn’t explain why the same MY 3.2 did have one, when the 4.0 did.
Just had my TB cleaned up, damn it was dirty, I even had to lightly sand it with 800 to get to shiny metal as even after a lot of scrubbing with scotch pad I could still see a smudge where the butterfly parked(must have been some sort of a scale). Of course both IACV bolts snapped like they were made of butter so that added another hour of work to it
This the machined surface, the other side is similar, I suppose that's why a gasket isn't needed? I had to use a crowbar to remove it after getting the bolts off, it was stuck for good without any instant gasket. I might use some if I can find it though on reassembly.
I really wish Jaguar used better bolts here
It seems its the same story with 40s and x300s. I know its loctited but still, they snap so easily, plus you have to take the whole TB off to get to IACV bolt on the x300. I've cut bolts in the middle so hopefully if I ever have to remove it, I should be able to do it without removing the TB.
One thing I remember you had trouble with, it's this and associated high idle:
I know that it looks like there is no adjustment possible here but if you loosen up these bolts the whole thing will move by a 1mm each side and that's enough to get the idle down back to normal(or very high). Either do it from underneath while car is running or remove the TB, plug the TPS in, turn ignition on so there is power to the sensor and adjust to one side(sorry cant remember which one), either check the current/adjusted value through an OBD scanner or on green/yellow cable. Remember that ~0.1V when closed, makes all the difference
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.