Coolant temp sensor

[325issguy]

Hey guys,

I just bought an 1987 325is with a 98 m52 swapped into it.
My car has a m3 dash. I cannot for the life of me get the coolant temp gauge to work. I have tried the stock m3 temp sensor and it has not worked even when i switched the plug around... Anyone have any tips? I have checked the wiring, it works fine.

My oil temp gauge does not work either. The previous owner said that it has a 88 oil temp sensor but I have not confirmed it.

[Uber E30]

where did they put the sensor?

[325issguy]

I have this part.

http://www.zionsvilleautosport.com/store/shop.mv?Screen=PROD&Store_Code=6134&Product_Code=OBDITSM&Category_Code=CCSE36

It is installed as shown, there is coolant in there every time I remove it to change sensor, etc. I just dont get why it doesnt work. Do I need to ground the actual part or should it just ground from screwing in?

[FredK]

I'm pretty sure you need to run a separate ground from the $49 manifold to somewhere on the block/head.

[325issguy]

How did you all run the ground?

[FredK]

There is a screw on the machined piece. Crimp a ring terminal to both sides of a wire. Attach one side to the machined piece. Attach the other to the front of the valve cover, where the fuel rail ground attaches.

[325issguy]

Thanks guys,

I dont remember seeing a screw but I will double check. I tested a ground on it tonight and that was my problem.

-Chris

[almostM]

Can I get more info on your M52 swap? Or other M52 swaps

[e30devo]

Can I get more info on your M52 swap? Or other M52 swaps

haha.

[z31maniac]

Can I get more info on your M52 swap? Or other M52 swaps

Search.

You can find the answer to just about every question you could possibly have on 24v swaps without starting a single, new thread.

[325issguy]

Just for clarification, my sensor manifold had no screw in it. I just ran a clamp around it for the necessary ground. Works like a charm. Now for the oil temp gauge haha.