Phil01

Need to plug I to techstrram and live data, check evaporated fin temperature and both solar sensors are working as its these sensors that boost the lower temps when it detects solar uv

https://www.quora.com/What-is-the-function-of-a-clutch-plate-torsional-coil-spring

When the torsion springs go weak in either the pressure plate or in the DMF then the engine torque is not absorbed and can and does send a thump through the transmission and can move the gear lever, a mild case of torque fluctuation. But as others have said, check your rubber mountings as easy 1st check. The thud sounds like a low frequency thomp and can feel it as well as hear it.

On alloy wheels the wheel is centralised by the shouldered nut, On steel wheels it's centralised by cone taper on end of nut. If you look at a Toyota shouldered alloy wheel nut you will find it also has the cone taper at end of nut is it will fit both types of wheel securely

I'd be looking at the damper springs in the pressure plate, gone weak and not absorbing the torque

For emissions, it prevents a massive negative pressure in the intake.

Mr Muscles oven cleaner, if you doubt this tip then dont do it, you need to be confident

What area are you? May just need an actuator clean and lube and a relearn for the shift points and clutch bite point, all this can be carried out using Techstream, Toyota diagnostic kit or any GOOD diagnostics like Wurth Wow or Autel etc

You had a remap or just a dpf coded out?

https://www.ebay.co.uk/itm/For-Denso-D4S-D4R-Xenon-HID-Headlight-Ballast-Control-Unit-KDLT003-DDLT003-/283790604551?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=710-127635-2958-0

And of course you need the front seat tilt fitted for a 3dr

Auris mk1 pre face lift and face lift seats fit either model, just watch out for 3dr and 5 Dr. 3dr do fit a 5dr but with a small mod to outer lower fitting. 5dr fitted to a 3dr will be awkward as sit higher on rear seat base

95 psi...there is your problem, its not just compression its also the lack of negative pressure or vacuum to pull that fuel through the combustion chamber and readily atomise it with the air, just solid fuel droplets that then condense on the cylinder walls and can not propagate a complete combustion, hence petrol in oil, black sooty plugs Your engine will never ever work until you sort your compression loss...its not all about compression as vacuum is just important, you loose comp and your have lost vaccum

How long you had it?, if very recent it Maybe worth trying a hard battery reset just before your hill climb, it will then adapt to your driving demands rather than relying on previous drivers driving style

Just check your bulbs. One may have blown ages ago and then the 2nd one just recently...