Tach checklist

[Mastrcruse]

Alright, I have one weekend to get the tach to start working before I don't see the car for 1 1/2...unless I get it transported down to TX.

The tach doesn't work and I need help to see what I can do to get it going.

Just a reminder....This is a 318 that has an M30 in it.

So could someone help me, pictures (I'm a visual guy), write-up, checklist of what I need to do, make sure of, and double check to see why and what I need to fix so that the tach works?


Do I need to change these? Both, I was told, work fine but it hasn't solved my tach problem. Do they have anything to do with the tach? I ask because I believe I remember reading it did.

http://www.realoem.com/bmw/showparts.do?model=DC74&mospid=47231&btnr=12_0312&hg=12&fg=05

Also, on a side note, my speedo doesn't work. Might be a stupid question but where is the speed sensor for the car originally? Is it the sensor in the dif.? How might I get that working with the ole' m30?

Thanks
DJ

[Mastrcruse]

If it helps, I still have this thing hanging.

[Doughnut]

The sensor pictured is the crank angle position sensor - the speed sensor is on the diff cover.

Cant remember what the tach wire color is...

[Mastrcruse]

Stupid question...do I even the crank angle sensor? The motor works just fine without it connected to anything. I have the wiring diagram but is there something special I need to do to wire the 318 speed sensor up to the m30 back to the 318 cluster or does the speed sensor have nothing to do with the motor?

I was thinking it didn't matter what motor it had in it because it was sensing the diff not the motor.

[JoeMadoo]

If your car is pre '88, Connect the black wire from the c104 connection in your glove box to pin #9 of the C101 connector in your engine compartment.

[Mastrcruse]

Thanks, its actually a 91.

[wildstoats]

If your engine is a B34 that is a diagnostic sensor that does nothing.

[Mastrcruse]

Yep b34. Thanks