can anyone give me a diagram on the ecu plug for a 325 1994

[swifty123]

hi im fitting a 325i engine in a 1998 z3 and have a problem with it starting? its cranking over on the key but its not sparking dose anyone have a diagram on the ecu plug for what i need to get it to run thanks dan

[Grrrmachine]

Is this an M20, M50 or M52 engine?

[swifty123]

hi thanks for the replie its an m50b25

[Grrrmachine]

If it's not an E30 car or E30 engine, you're better off asking for help in the M50 forum:

http://www.e30zone.net/modules.php?name ... forum&f=56

In the meantime you can read what we know about these engines:

http://www.e30zone.net/e30zonewiki/index.php/M5x

[Brianmoooore]

Enter your engine into the drop down boxes here: http://www.autolib.diakom.ru/CAR/BMW/
You do realise this engine has an EWS immobiliser?

[swifty123]

hi thank for all the replies. i could not find anything that says ews on it under the glove box and there is no chip in the key i thought it would have to have a chip in the key? i have the hole car the engine came from

[Brianmoooore]

on closer inspection of your OP, I see you don't mention the age of the engine.
The ECUs for a M50Tu engine come in two flavours - same type number but one is a maroon label and the other silver. The silver has EWS, the maroon does not.

[swifty123]

hi sorry its an 1994 325 and its has an maroon label. thank you for the help any ideas why it has no spark it turns over and there is alive feed (12 volts) to the coil packs but the signal wire seems weak (4volts at max) ?

[Brianmoooore]

Assuming things are wired correctly, the usual reason for no spark is a failed crank position sensor.
Does the fuel pump run while cranking?

[swifty123]

theres not alot to plug in wrong! but not sure if fuel pump is working but the z3 has an ews system is there any way of getting ride of it or by pass it

[Brianmoooore]

The only thing the Z3's EWS should be doing now is interrupting the signal to the starter motor.
This is easily bypassed by removing the two thickest wires from the EWS module (black/yellow and black/?) and joining them together.
Need to know if the pump works when cranking.

[swifty123]

im sure the pump is working as i can smell petrol when its turning just need to know how to get it to spark

[Brianmoooore]

im sure the pump is working as i can smell petrol when its turning just need to know how to get it to spark

Doesn't prove anything. Need definite proof, either by listening to the pump with the covers off, connecting a test bulb across the pump terminals, or disconnecting the supply pipe and monitoring the fuel flow.

[swifty123]

ok will try that tomoz! had a mate pop over with his new diagnostics kit and it came back with dws ie its immobilised any ideas.

[Brianmoooore]

Only needs battery + and - of the engine loom to be connected (ring terminals), and power on the green wire in the loom plug for the engine to run.

[swifty123]

legend disconnected the ring terminal jumped power to the green wire and now it sparks just got to rewire it up to the car thanks again