A couple of pointers please

For all your questions, problems and DIY stories
Post Reply
Sel The Don
E21 starter
Posts: 29
Joined: Mon Feb 10, 2020 11:35 am
My E21(s): 1983 315

A couple of pointers please

Post by Sel The Don »

Hello all, I've nearly got all the electrics sorted on the car but have hit a few stumbling blocks.

I only have the wiring diagram for the 320/6 and 323/6 so any help will be much appreciated!

Image
There's this set of wires next to the main light switch and rear window defogger, I can't seem to trace this to anything. Are these for the fog light?

Image
Found these 3 wires coming out of the main wiring loom in the engine bay, I'm thinking that these may be for the brake pad wear indicator but I can't find them on the diagram.

Image
There's this sensor on the front of the engine block that has the connector snapped off, is this the coolant temp sensor? What about the other blanked hole?

Image
So onto the carb, any ideas what's going on with this wiring? Does anyone know where the water and vacuum pipes are supposed to go?

Image
Same for these wires too, I can't trace them on the wiring diagram.

Image
Back of the block next to the dizzy. What sensor is this?

Would be a massive help if anyone that knows their way around a 4 pot carb engine that can give me pointers.

Cheers


User avatar
nic65
Upcoming E21 fanatic
Posts: 131
Joined: Tue Sep 18, 2018 2:12 pm

Re: A couple of pointers please

Post by nic65 »

oil pressure lamp
Sel The Don
E21 starter
Posts: 29
Joined: Mon Feb 10, 2020 11:35 am
My E21(s): 1983 315

Re: A couple of pointers please

Post by Sel The Don »

Thanks for the reply but which one are you talking about?
User avatar
nic65
Upcoming E21 fanatic
Posts: 131
Joined: Tue Sep 18, 2018 2:12 pm

Re: A couple of pointers please

Post by nic65 »

the last photo...

First photo is for defogger.

Second photo,i dont see enough.

Third photo water signal
Sel The Don
E21 starter
Posts: 29
Joined: Mon Feb 10, 2020 11:35 am
My E21(s): 1983 315

Re: A couple of pointers please

Post by Sel The Don »

Ok cool.

The second photo is the wiring loom from the dash into the engine bay, the black thing next to the wires is the electronic spark control unit.

EDIT: It's not the defogger as that's already connected.
User avatar
Jeroen
Site Admin
Posts: 29194
Joined: Tue Sep 14, 2004 12:23 pm
My E21(s): '81 323i Baur
Location: The Netherlands
Contact:

Re: A couple of pointers please

Post by Jeroen »

Pity the wiring has seen some modifications over time, for example the blue and red wires are not part of the original wiring loom. Apart from the main wires you will always see a combined color coding, for example blown with white stripe (brown-red), blue with red stripe (blue-red) and so on. If you have the 6 cylinder wiring diagram, the color coding will be identical on your car so that may already help you identify the purpose of wires.
Regards/groeten, Jeroen
User avatar
nic65
Upcoming E21 fanatic
Posts: 131
Joined: Tue Sep 18, 2018 2:12 pm

Re: A couple of pointers please

Post by nic65 »

Sel The Don wrote: Thu Apr 07, 2022 8:45 pm EDIT: It's not the defogger as that's already connected.
Front defogger with dedicated switch for front and rear
Sel The Don
E21 starter
Posts: 29
Joined: Mon Feb 10, 2020 11:35 am
My E21(s): 1983 315

Re: A couple of pointers please

Post by Sel The Don »

Jeroen wrote: Fri Apr 08, 2022 11:58 am Pity the wiring has seen some modifications over time, for example the blue and red wires are not part of the original wiring loom. Apart from the main wires you will always see a combined color coding, for example blown with white stripe (brown-red), blue with red stripe (blue-red) and so on. If you have the 6 cylinder wiring diagram, the color coding will be identical on your car so that may already help you identify the purpose of wires.
It's a massive shame and what's worse I'm working off the injection equipped vehicle wiring diagram so most of the wires are not even the same.

No-one seems to know about the carb vacuum piping or the coolant piping routing so I'm just going to get it working as much as I can and trade the car in for something else.
Sel The Don
E21 starter
Posts: 29
Joined: Mon Feb 10, 2020 11:35 am
My E21(s): 1983 315

Re: A couple of pointers please

Post by Sel The Don »

nic65 wrote: Mon Apr 11, 2022 9:01 am
Sel The Don wrote: Thu Apr 07, 2022 8:45 pm EDIT: It's not the defogger as that's already connected.
Front defogger with dedicated switch for front and rear

So the front defogger is electric and doesn't work from the fans?
User avatar
Jeroen
Site Admin
Posts: 29194
Joined: Tue Sep 14, 2004 12:23 pm
My E21(s): '81 323i Baur
Location: The Netherlands
Contact:

Re: A couple of pointers please

Post by Jeroen »

Sel The Don wrote: Mon Apr 11, 2022 7:39 pm No-one seems to know about the carb vacuum piping or the coolant piping routing so I'm just going to get it working as much as I can and trade the car in for something else.
sadly I'm no carb specialist, these are getting rare these days but a good 4 cyl workshop manual should be able to help you out?
Regards/groeten, Jeroen
User avatar
nic65
Upcoming E21 fanatic
Posts: 131
Joined: Tue Sep 18, 2018 2:12 pm

Re: A couple of pointers please

Post by nic65 »

[/quote]
Front defogger with dedicated switch for front and rear
[/quote]


So the front defogger is electric and doesn't work from the fans?
[/quote]

sorry, i meant the combo switch for the front and rear fog lights
Sel The Don
E21 starter
Posts: 29
Joined: Mon Feb 10, 2020 11:35 am
My E21(s): 1983 315

Re: A couple of pointers please

Post by Sel The Don »

Jeroen wrote: Mon Apr 11, 2022 9:47 pm
Sel The Don wrote: Mon Apr 11, 2022 7:39 pm No-one seems to know about the carb vacuum piping or the coolant piping routing so I'm just going to get it working as much as I can and trade the car in for something else.
sadly I'm no carb specialist, these are getting rare these days but a good 4 cyl workshop manual should be able to help you out?
Are there any 4 cyl manuals for the E21 available? I also have the crappy Pierburg 1b carb so will have to take that into account.
nic65 wrote: Mon Apr 11, 2022 9:56 pm
Front defogger with dedicated switch for front and rear
[/quote]


So the front defogger is electric and doesn't work from the fans?
[/quote]

sorry, i meant the combo switch for the front and rear fog lights
[/quote]

Gotcha. I suspected it was for for the fog lights even though the colours are different to the manual I have. Cheers
Sel The Don
E21 starter
Posts: 29
Joined: Mon Feb 10, 2020 11:35 am
My E21(s): 1983 315

Re: A couple of pointers please

Post by Sel The Don »

So I'm very nearly done with the wiring. I have 3 violet/green wires left over.

As they're joined I presume that they connect to the two sensors on the carb and to the pulldown unit?

One of the violet/green wires also has a green/black wire with it, although I don't know what it's for I'm presuming that these are for the pulldown as it has two connectors on it. Where does the violet/black go, to ground? All grounds are brown so I'm unsure.
Post Reply