Crank Sensor???

[1990e30coupe]

Hey Rev,
I am not getting any spark, figure its the crank sensor. It is on a 1987 325e!
I pulled the motor and put on all new seals/gaskets. What I need to know is if there is supposed to be an air gap for the crank sensor and what the amount is as far as numbers for measure.
Also the sensor is wired to what I believe is a test site/plug and then routs from that to the brain, but I have never seen two test sites (just obd1), therefore, can someone clarify for me if its an actual test site.
If it is a bad sensor I wouldn't even know where to begin to change it out since its hard wired in.

Any help would be greatly appreciated!
Thanks Rev

[Andy.B]

Your car has the Motronic 1.0 fuel injection system that uses 2 sensors located on the driver side of the transmission bellhousing for crank position.

The two sensors are visible in this picture: AFAIK, one senses the rotation speed of the crankshaft, while the other sensor TDC of the crankshaft.



The sensor on the pulley of the crank that you are seeing does not actually provide a signal to the dme, and is used only for the BMW scan tool that plugged into the diagnostic port.

[Andy.B]

I would get a voltmeter and start checking things out. No spark could be caused by plenty of things besides a band crank sensor.

[1990e30coupe]

Man thanks guys, The Chilton's I have don't tell me shit. I am working on getting a Bentley, anyone know where to order them through ???
I must have swapped the two plugs around I know exactly what it is. Hopefully I didn't fry anything by plugging them in wrong ill swap them around.

[1990e30coupe]

She fired up, I had the plugs switched thank you! Saved me time of not having to search around. I got a guy coming with plug in to run and test everything then she will be on the road. Also if anyone knows what idle rpm she needs to be running at right now its just below 1k rpm about 800-900?

Thanks again Andy

[Andy.B]

800-900 sounds a tiny bit high. If the idle is smooth, but high, check the idle control switch on the thermostat housing. If it is not working then the separate idle control module used in the eta's won't kick in, leading to a consistent high idle.