Thanks for you input. This is Luft JetTronics .The throttle switch has 3
pins numbers 2,3 and 18
It is my understanding that the resistance of the two pin pairs should be
Idle EveryOtherPosition
2-18 0 ohms infinite ohms
Full EveryOtherPosition
3-18 0 ohms infinite
Just thinking of taking switch assembly apart.

"Randolph" > wrote in message
...
>
> mark barron wrote:
> >
> > 1. the resistance at the two pins for Idle at idle is not zero but about
> > 10ohms (2-18)
> > 2. The resistance for Full throttle is infinite in all positions. (3-18)
> >
> > Can this be easily repaired or do I have to get a new sensor
> > Many Thanks, Mark
>
> My experience is with CIS-e (Bosch KE-Jetronic) fuel injection. I know
> BMW has used this on both the 3 and 5 series, but I don't know what the
> 1990 535i had. It is not clear to me whether you have switches or a
> resistive throttle position sensor. If you have the latter, my
> experience does not apply, read no further.
>
> When my idle switch broke, the dealer would only sell me a set of idle
> and full throttle switches and wanted more than $100 for the set. I was
> able to find a new idle switch at the junk yard for a couple of bucks. I
> cut the old one out from the wiring harness and soldered the new one in.
> I found that the same switches were used across a number of different
> models and model years and even on models with different types of fuel
> injection. As long as the throttle body was the same, the switches
> seemed to be the same as well.