help

[TStroop]

Can anyone tell me what this little box thing is with two fuse or resistor looking things in it is? It has two wires going into it on my car but no wires coming out Car is an 87 325e with a build date of 11/86, Any help is appreciated.

[TStroop]

This is not my car found this picture on here. I am currently swaping a 88 325i engine into it with a 87i engine harness and the dme out of an 88i

[nebulous123]

I think that's the fuses for the main relay and fuel relay. Don't quote me.

[TStroop]

They only have two wires going in but none coming out so if indeed they are how the hell does it work

[MR 325]

It's an accessory fuse box. That style was only on early model cars.

[jlevie]

It's an accessory fuse box. That style was only on early model cars.

Correct. One fuse is hot all the time and the other hot only when the ignition is on.

[TStroop]

Ok it has 4 screws for wires there is only two wires in it, is there supposed to be 4 wires?

[jlevie]

Ok it has 4 screws for wires there is only two wires in it, is there supposed to be 4 wires?

That fuse block was for aftermarket additions. If none were added there will be two wires in and none out.

[TStroop]

Great thanks, well the search for the no spark, no fuel, no current to coil problem continues

[jlevie]

No spark and no fuel pump operation (and no injector firing) could be:

No timing data to the DME
A DME power or ground issue
A bad DME

But the coil is powered directly from the ignition switch Via C101. So if there is no power to the coil the investigation should focus there as that circuit also supplies the START signal to the DME.

[TStroop]

Take that back have power to te coil just no spark or fuel pump operation.

[TStroop]

update. fuel pump relay isnt getting signal from the main relay. The relay has constant power and ground to the dme. just no voltage from main relay. tested the main relay the way the bently manual says to and it states to replace relay if it has power here and ground here. so replace relay still not sending power to fuel relay. Anyone know where the wire from the main relay to the fuel relay goes? Dme? Bentley isnt really helping much

[jlevie]

See above. You need to be looking at the timing reference sensors first, then the DME power/ground, and finally at the DME.