The comprehensive DOHC engine swap thread.

[2mAn]

where do the intake temp sensors connect? according to the diagrams Ive found, there is two? does one plug into the head next to the coolant temp sensor?? its roughly the same location

[pmat]

Dunno if its been mentioned, but a coding plug from a e28 535i works. the housing dosent fit in the e30 cluster tho, gotta take the chip out of the e28 plug.

[kevvve]

Thanks guys I appreciate the help.

[36brua]

Seconded, iirc the e34 pan won't fit with that on anyways.

^^ true . if you remove the bracket vs. cutting off the vertical leg , you need 2 new main cap bolts. they are TTY

[jclar]

I believe that has to come off for (some?) E34 pans to fit.

Seconded, iirc the e34 pan won't fit with that on anyways.

[agent]

I believe that has to come off for (some?) E34 pans to fit.

[kevvve]

I was going over what I've done so far and this bracket looks bent to me. Can anyone chime in? Anyone have a part number?

[2mAn]

Leave the one for the DME alone and re use your old m20 one for the cluster.

mine doesnt have any sensors, so Ill need to buy the E36/ E34 one

[Roysneon]

Leave the one for the DME alone and re use your old m20 one for the cluster.

[2mAn]

So I need one more coolant temp sensor (E36/E34) to go to the DME and I can use the one I currently have (M20, blue with 2 pins) and just have to wire that to go to the cluster.

[kevdeno]

Coolant Temp Sensors:

On your E36, one sensor is for DME and the other is for gauge cluster. You have to replace the sensor which feeds signal to the E30 gauge cluster so it will read correctly. The E36 one reads a vastly different resistance for a given temp.

1. E36 DME, E36 coolant temp sensor.
2. E30 gauge cluster, E30 coolant temp sensor. Just thread it into the spot where the old E36 coolant temp sensor for gauge cluster was. See your wiring documentation to make sense of which wires do what, but it should be in the harness already and you don't have to do anything.

[2mAn]

can someone answer the question above about the temp sensors?

[agent]

Ahh gotcha.

[2mAn]

mine is an aluminum block M52, but it was pulled out of a 97 Z3 and raced before I got my hands on it, so it may not be the original head

[agent]

noticed the 2.5 stamped on the head, any chance I already have the M50 head and not a M52??? This motor has a questionable history

M52s came in both 2.5 and 2.8 varieties. In the US the 2.5 came in E36s badged as 323s.