DBF

My crack reference sensor plug has crumbled a part, and when removing it I noticed my car doesn't have a speed sensor. Should the opening in the bell housing have a plug of some type? Also, where is the speed sensor on these cars. Thanks for the help.

cajuncroc

The speedometer sensor is on top of the transmission.

gtroth

One sensor (speed+ref) on the 16V motors.

JohnKoaWood

IIRC on an S2 (16V motors) the sensor on the bell housing is the speed sensor, the reference sensor (hall sender) is in the distributor housing for the cam timing.. but I could be wrong!

And yes there are 2 sensors...

Wipeout

I believe you are correct. One in the bell housing and the hall sender at the cam.

gtroth

No. One sensor in the bell housing for speed and ref. There is a 'missing tooth' on the notched speed gear that the 16V dme's pick off as reference pulse.
In this post of mine is a scope trace I made of what comes off the speed/ref sensor:

https://rennlist.com/forums/924-931-...p-xposted.html