Throttle Position Sensor Adjustment Options

[Island_Racer]

Hello,

I had to pull off my tps recently and i installed it again without much thought......i got misfires at WOT and it hit me instanly the tps needs to be adjusted properly......

What is the procedure for said task? And what resistances shud i be reading between which terminals....

[Island_Racer]

Ok, so i position the tps based on the specs: engine is hunting at idle
I decided to check the base timing anyway: it was waaaaay gone not even in the area that has increments (car wont even drop its idle when the pins are shorted...it was still hunting between 1000-1300....but CEL was flashing so i imagine it was in the calibration mode)
I rotate the distributor to full retard: timing comes back as far as 16 btdc
So i loosen the tps (after marking the spot) and put it to full retard as well: timing goes to 5btdc and the car idles at 700-800 (the correct idle for base timing mode, i also cud move the distributor to the 10 if i wanted)

Instead

I turn the tps slowly to see if i cud catch the 10 using it (distributor is at full retard still): any movement at all away from the tps at full retard makes the timing advance back to 15-16

So i put the tps back to that full retard position and set the dizzy to get the right timing....got it to 10 btdc (pull out the shorting wire)

I go for a drive and get a few good pulls right up to redline but then after awhile, at WOT (running 10psi) i get misfires at 5000 and up rpm
It'll miss...continue pulling...miss some more...then continue pulling up to redline (i was so scared while doing it, but wanted to see if it wud clear up as i went higher)

But it isnt every time i go WOT this happens...sometimes it pulls perfectly up to red line and sometimes it does the other

I broke my laptop so i cant log info rite now to analyze, but from what i see right when it happens

AFR's in the 10's
Fuel pressure is ~54
Boost seems to hold steady (10psi)

If i raise the boost pressure to 12psi: Misfires happen right as it hits full boost @ WOT even before 5000

I put in new BKR6E plugs with 0.031" gap. Checked distributor and wires....

I used to run 16 psi and had BKR7E plugs with 0.028" gap perfectly fine.....sigh

Its the fact it doesnt always happen that is making it hard for me...

This post has been edited by Island_Racer: Dec 13, 2013 - 10:20 AM