I've been noticing that my throttle isn't fulling disengaging when you let off the accelerator. It'll sit at about 1100 rpms and It just doesn't coast, plus its causing a lot of heat on the brakes. I've tried greasing the cable and I've recently ( within the past year) cleaned the throttle body. It's only done about 1,000 miles since I've done that. Is there a common issue with these throttle cables I'm missing?

 

I almost NEVER use the little gifs but here is one.

Jaguar addressed this issued a few decades ago.

bob

 

This may not be a universal solution, but when I brought my x300 back to life, it was sticking around 2000 rpm. I sprayed the throttle shaft area with PB blaster and worked it back and forth, fully opening it and letting it snap shut several times, and it hasn't been a problem 1000 miles later.

 

Might need this mod:
https://www.jaguarforums.com/forum/x...carman-111454/

 

You can put your hand on the butterfly shaft tower and twist it to see if you have some travel before the idle stop

This will split the issue in halve , either you have a mechanical issue or a IAC valve not " stepping " to the correct position

Never read of a ELM - 327 device reading of the TPS sensor reading 0 % but more like 11 or 14

There is a post on using the original throttle return spring and preloading it around to the next screw post that sticks up there for more return force

Do not adjust the TPS mounting adjustment until further knowledge

The TPS should read 0.60 + or - 0.02 volts DC on the Green / Yellow colored wire as it goes over the fuel rail but do not adjust yet

http://www.jagrepair.com/images/Auto.../jagxj1997.pdf see page 50

Feel under the butterfly for the locking clip to be on the EV - 1 type connector to the TPS . Mine was missing and you can barrow one from the trunk dome lights

Scariest thing for me is running the engines on the Boeing 767 after fixing them as the nose bounces around with a light fuel load and empty cabin hoping the parking brakes don't let loose around the vehicles

Editing

 

All the above members offer far more sophisticated advice and are clearly far more knowledgeable than I, however I had such an issue, the throttle would stick and would accelerate on its own. All I did was identify the throttle cable and kind of separate it from the rest of any other hoses and whatnot, and just set it on top of everything else, this solved my problems. Every once an a while (perhaps once or twice a year) it may get caught on something and stick open again, but just separating it and laying it back down always seems to help. Happy hunting!