New technical info for adjusting throttle position sensor
 

On the IBMW site there is a new and interesting technical piece regarding the adjustment of throttle position sensors.

The full title of said piece is:

'Zero=Zero method for adjusting BMW oilhead throttle position sensor to reduce or eliminate engine surging'

Whilst it is not specifically aimed at the 'S' it does make interesting reading. However, I also think it would require a degree of bravery to tackle this procedure.

Worth taking a look at on http://www.ibmw.org/

Also look at the disclaimer now issued regarding incompatible procedure.