Crank sensor location 1988 M3

[840ways]

I am unable to locate the crank sensor on my 1988 M3. I thought it would be up front across from the crank pulley somewhere. Can someone provide the exact location of the crank sensor?

My 1988 M3 cranks over but won't start. I used a In-Line Spark Tester. There was No spark in any of the 4 cylinders. Most likely the Crank Sensor. I have had a power steering reservoir leak. Their could be a bad connection or a bad Crank Sensor.

[sprytel]

old thread - not sure if you still need the answer. the crank sensor is on the bell housing - it reads pulses off of the flywheel

[Del Schier]

I sort of have the same problem. I just finished a clutch and Metric Mechanic transmission install and everything with the work seems great except the tachometer is now haywire. There are 3 flywheel sensors. I think the two bottom ones feed the ECU to make the engine run and the top one is only a diagnostic TDC sensor. I am afraid I screwed one of them up making the tach go haywire but the engine seems to be running, starting and idling nicely. The tach jumps wildly all over the place, not really following the engine RPM. All the other gauges are good and the tack was fine before I had the sensors out. Anyone have any ideas on the problem, and/or tell me which one feeds the tach, if any.

[sprytel]

its been a looong time since I've looked at the wiring diagram, but I am almost certain that the tach is driven from a signal from the ECU, not from a flywheel sensor. the sensors feed data to the ECU that use it for the engine control, then processes that signal into a signal (square wave, I think) that the tach uses to create the dial reading.

- - - Updated - - -

yes, I just confirmed - that tach gets its signal from the ECU

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