M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Electrical => Topic started by: kasmankk on February 04, 2016, 10:24:40 PM
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Hi, i need a little help. My e30 has an e36 m42 swap by previous owner. My problem is the idle speed drops when AC is ON. As if the ICV is not responding.
I did some checking , all 3 signals to DME were not connected.
#48: compressor relay output
#85: pressure switch input
#86: anti stall input
My car is not using stock acond system. I am using an aftermarket electronic thermostat to control the compressor.
Anyway, i have figured out dme pin#48 and pin#85. When pin#85 is grounded, pin#48 activated. And the ICV did respond.
But pin#86 does nothing if it is connected to 12V or GND or OPEN.
Any idea, on how what kind of input signal pin#86 is looking for?
Looking forward to hearing from you. Thank you.
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No idea. I'm curious too; that's a pretty common swap that'd be great info for the E30 owners on here. My A/C hasn't worked since before I owned the car, might also help with any R134 compressor upgrades.
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not sure if im too late but i just discovered this after e36 m42 transplant into my e30
remove the AC button on the dash, check with a bulb tester to see which wires has +12V signal when turned on, splice this wire to the DME pin #48, or just splice the same way at the wire behind pin #48. This will tell the DME that the AC is switched ON.
Next ground pin #85 to any nearest metal you can find, that this might increase your idle a small bit but still less thank 1k rpm.
the idle rev hunt goes away and will not bog/stall each time you stop at traffic lights with the AC on.