Re: Rough running
Rusty,
from my calculations, your TPS looks like it is working. It's different to mine, but it does seem to work.
On paper, applying 12V across pins 1&3, results in :-
Closed:
Mine_
[email protected] = 1V
Yours
[email protected] = 0.7V
Open:
Mine_
[email protected] = 9.7V
Yours
[email protected] = 12V
Yours is certainly not stuck in the open position, when closed. (But when fitted, it may never close completely due to mechanical constraints)
Yours does have a wider range than mine, and I'm not sure if the ECU can handle that. The ECU MAY be thinking that the throttle is open more than it really is - it would run RICHER than it should.
There is 1 other thing you could look at. The resistance between pins 2&3 should vary smoothly from 1.143 to 4.62, as you rotate the TPS from closed to fully open. It shouldn't jump. If it jumps, it is most definitely crook.
My bet is that your's is crook, because the range is too wide.
Keep us posted. We're learning heaps.
(If you change it, and it fixes the problem, would you mind sending the TPS to me? I'd like to find out how it failed.)
By the way, were you aware that the TPS is a BMW part?