327i c104 wiring

[ElijahKnapp]

Ok I've been searching for some hours now and can't find a set in stone answer for this.... I have an 86 325es that I am swapping to 1.3 with a 885 head. Everything is in and wired up. The c104 is the last thing I have to do. At first I was getting no spark or fuel. I'm using an 89 harness that has one 3 wire plug and one 2 wire plug coming off before the DME in the glove box. Old c104 has black, green/red, and white/yellow on the body harness side connected to thick green, thin green, and white wires on the original harness c104. The NEW 89 harness on the 3 wire plug(looks like a rounded c104) has brown, blue/red, green/purple wires. I tried splicing the 3 wire plug directly into my 3 wire c104 body side plug. This gave me constant fuel flow with key in the ON position, which isn't right from my understanding, and also gave me no spark still. Does anyone have a definite answer on which wires to splice the c104 into? Thanks in advance.

[Untouched]

C104

Ok I've been searching for some hours now and can't find a set in stone answer for this.... I have an 86 325es that I am swapping to 1.3 with a 885 head. Everything is in and wired up. The c104 is the last thing I have to do. At first I was getting no spark or fuel. I'm using an 89 harness that has one 3 wire plug and one 2 wire plug coming off before the DME in the glove box. Old c104 has black, green/red, and white/yellow on the body harness side connected to thick green, thin green, and white wires on the original harness c104. The NEW 89 harness on the 3 wire plug(looks like a rounded c104) has brown, blue/red, green/purple wires. I tried splicing the 3 wire plug directly into my 3 wire c104 body side plug. This gave me constant fuel flow with key in the ON position, which isn't right from my understanding, and also gave me no spark still. Does anyone have a definite answer on which wires to splice the c104 into? Thanks in advance.

Hi. I am also in the middle of this conversion. Those 3 wires on body side of the c104 are for the tach. From my understanding, the black wire is for tach and the white/yellow is for the fuel econogauge. I currently do not have them hooked up (no tach) and am able to get the car started, though it seems to not like having much throttle applied. Idles fine though.

Anyway, those wires don't have to do with you not getting spark/fuel. What is the reading on your Crank Position Sensor on the front of the engine? Should have a reading of around 540 ohms between 2 of the pins. That one sensor controls most of the spark/fuel timing.