Does this sound right? (m42 throttle body, question)

[call me jack]

I was talking to a guy at school, the other day and he told me that he wanted to run MS on his 318is, but to do that he would need to retro fit in a different throttle body/tps. His logic was that the m42 tps was non varying, and only read "idle" "on" and "wot" inputs (which just seems crude).

Can any body shed some light on this? I searched around a little bit, but couldn't find much. I even looked in my bently for a wiring diagram, at which point i discovered it doesn't feature the m42...

[DaveSmed]

The M42 is a true three wire potentiometer variable output sensor. He's thinking M20.

[gearheadE30]

basically what that means is that there is no need to retrofit a different sensor. potentiometer=variable resistance depending on the rotation of the throttle. The m20, along with other old engines, use the on-off switch. Apparently people typically retrofit M50 tps's to the M20 to run MS, but the m42 doesn't need that.

[call me jack]

basically what that means is that there is no need to retrofit a different sensor. potentiometer=variable resistance depending on the rotation of the throttle. The m20, along with other old engines, use the on-off switch. Apparently people typically retrofit M50 tps's to the M20 to run MS, but the m42 doesn't need that.

i see. i should've looked at that in my bently, if it applies to the m20. thanks guys.

[tjts1]

Yes its a POT. Now with diagram.

http://www.autolib.diakom.ru/CAR/BMW/1991/318%20Series/WIRING%20DIAGRAMS/fig02.pdf