1. Can I adjust the Throttle body for additional travel to satisfy the TPS?
Don't do it.
What you describe is more than likely related to a linkage rod problem.
You can't tweak the TB to open any more than it opens to begin with anyway. It only offers adjustment for how far it closes and that should never be tampered unless you know
exactly what you are doing as guessing and fiddling will only make things worse on the ECU and related while improving nothing.
2. Does it really matter if the WOT is not reading correctly as I do not drive the car at WOT in any gear?
2 parts.
Part 1: Yes it matters as it also triggers the ECU to run a little fatter fuel mix and in open loop.
If you've an electronic VVT it triggers that also.
(without all that going on, you're potentially running stupid lean when you
least want to do it)
Part 2: The 'WOT' switch should engage at around 57~59 degrees travel.
ie: not right at the WOT point (90 degrees) but slightly beyond half travel.
Again, that points most toward incorrect linkage adjustment.
ie: if the TB doesn't open enough due to incorrect linkage, the TPS is never gonna switch anyway, and as you say it does function when off the TB its prolly fair to assume that it is indeed a functional TPS.
You could try it against a protractor while it's off the throttle body if you wanted to confirm the angles more closely. From the point at which the idle switch is
just active (as in even a tiny deflection toward the open throttle direction will cause it to switch off) lay the protractor w/zero at that point and read the degrees of angle that the high travel switch engages at.
If it ticks at around 60 degrees it's linkage. Though anything less than 89 degrees (the max the TB can move regardless) would still imply the linkage is wrong and not letting the TB move enough to even engage a 'wide' TPS let alone reach full throttle.
Its a switchbox rig with a circut closing at zero TB deflection and a switch closing at 57+ degrees TB deflection while 'middle travel' is no switch engagement, it's not a progressive sweeper/potentiometer, so 'switch on' is 'switch on'.
(not to say its impossible for the high or low end switch to fail in a way that doesn't let it activate in the right range, but the odds of that are
REAL slim with outright failure being the more common defect)
But as Antony asked: Why aren't you ever using full throttle?
Granted you don't need to be there all the time, but in the grander scheme of things, it can actually help things in an Italian Tune~Up kind of way if done periodically.
Engines that are meant to to spool need to spool occasionally or they load up with carbon and junk and stuff and start to run like **** until said carbon and stuff and junk gets blown out. (these are not American V8's that cruise at 2000rpm all day)
*Simular premis: you wouldn't try to cut your lawn with the lawnmower set to 'idle' would you?
