84 930 12 pin plug engine bay?

[mgro1959]

Trying to figure out what this 12 pin plug is for. 14 pin on back of the relay panel for the engine harness but since my engine is at my friends does this plug get buried in engine or is it a mod. Car didnt have engine. Thanks Rob

[9dreizig]

That's stock ,, it will be plugged in near the rear fuse block on drivers side

[mgro1959]

Hi Todd: It already has a plug there. The engine harness goes to that. This plug wont reach the relay box.

[full quack]

That is the connector that goes to the fuse panel area, pops in from the bottom side.

However, in your picture, your firewall has a zilloin new holes drilled and some with grommets in them, they are not factory. Somebody has been moving/adding/re-arranging things around over the previous years.
Maybe someone did a COP system or dual ignition or EFI, or, or??

Mark

[mgro1959]

This car was running twin plug hence 12 holes in tge firewall. I have an 84 original engine from another car. This is an 84. My engine jas the 14 pin plug that goes the the back of this panel. That reciever seems intact. The wiring is wrapped and appears factory for this mystery plug. This plug will not reach the back relay panel. If it did then engine would be bypassed. Both this mystery plug and the engine plug are female.

[Jim2]

Rob, the cis system was supplemented with an electronic fuel head control. It's commonly called an extra injector or some such name since it looks like typical bosch efi injector mounted to the forward side of the fuel head. That harness will route under the drivers seat connecting to a motronic box. If this system was deleted the motronic box may be long gone.

[full quack]

I count 14 holes in the plug shown in the picture, not 12, yes at least 1 hole has no internal receptacle, that is normal.

An '84 is a gray market car(no import to America), so most likely would not have had the lambda system or the extra injector.

My '84 had none of that.

You can also swap out that troublesome "yellow" relay for a red relay, works flawlessly, ran mine that way for 12 years!

Mark

[flightlead404]

Originally Posted by full quack

I count 14 holes in the plug shown in the picture, not 12, yes at least 1 hole has no internal receptacle, that is normal.

An '84 is a gray market car(no import to America), so most likely would not have had the lambda system or the extra injector.

My '84 had none of that.

You can also swap out that troublesome "yellow" relay for a red relay, works flawlessly, ran mine that way for 12 years!

Mark

Doesn't even need a red relay. A black one is fine as there's no inductive load.

[full quack]

True enough on the black vs red, just seems that the red ones are more robust than the black one's.

Although everybody should have one of each as spares in the glove box anyway ;}

Mark

[mgro1959]

Thank guys for your input. I did pillage a wiring harness when I bought my 84 drivetrain years back. In fact I bought almost everything and more from the 84 being parted as I planned to put tge setup in my carrera. This car is 351 and the car parted was 460 something. They are close but the parted car did not have this plug on the harness which is my query. The lamda I have to look into. Thanks Rob.

[mgro1959]

Originally Posted by full quack

I count 14 holes in the plug shown in the picture, not 12, yes at least 1 hole has no internal receptacle, that is normal.

An '84 is a gray market car(no import to America), so most likely would not have had the lambda system or the extra injector.

My '84 had none of that.

You can also swap out that troublesome "yellow" relay for a red relay, works flawlessly, ran mine that way for 12 years!
Mark

Well after some investigation this car must have originally had a lamda system. There is a box under the drivers seat similiar to my 86 motronic. This car was sold new in Germany. Was built Oct 11 1983. The engine I have is less then 100 away up in # and I personally removed it and the complete wiring harness from that car. It didnt have this system. Presuming the wires on the 14 pin at the back match my engine harness can I bypass this system as my engine didnt have the components relavant to it? Thanks Rob. .

[jpnovak]

The electrical panel should have two different 14 pin connectors. The one in your picture goes to the engine wiring harness. The one in the picture should plug into the more forward end of the electrical panel. It sits right underneath where the CDI should be mounted in a stock system. If you do not have the male mating connector on the panel then you should look for the rectangular slot where it locks in place and the harness may be cut or behind it if previously moved.

[mgro1959]

Hi Jamie thanks for info. Is it possible for you to post a picture of the receiver your talking about. I dont seem to jave anything however there is a factory cap on some wires. Thanls Rob.

[jpnovak]

I am used to this electrical panel with visible second connector. MIght be earlier than your car.

The other possiblity is a Lambda connection that is usually attached by the DS shock tower.

[mgro1959]

I dont have that connection under the cdi box.Seems weird but there was an 86 engine in this car before. Its possible that the previous owner converted it from the 84 engine and added the ECU system. Sure looks as though its always been there.
If my engine does not have components for lamda as it didnt run this can I ignore and plug my regular 14 pin into the back of the engine relay panel. Have to trace wires but it looks intact. Thanks Rob.

[mgro1959]

The lamda connection is by DS shock tower and has the length to make it back to the area under the cdi panel. No plug though. Seems strange it would have those components removed. I did add a cdi box as that was not there and is required for my engine harness. Thanks Rob.

[flightlead404]

There seems to be some confusion about what connectors are being talked about here, perhaps just my lack of coffee.

There s/b a 14 pin female connector hard mounted on the bar at the front (rear from workers point of view) of the engine compartment, roughly in the position of the one shown in the OPs pictures.

However, the length of cable on the one shown in the OPs pictures is suspiciously long for it to appear stock to me.

The engine harness connector pokes though a hole in the rear sheet metal and is the 14 pin that connects to the hard mounted one.

Then off the engine wiring harness there is another branch towards the rear of the car that connects to the 14 pin connector on the electrical panel.

I've never seen a 14 pin connector under the CDI, certainly not on either my 82 or 86.

[mgro1959]

Thanks again for input. My car is an 84 and I have a complete harness and engine from another 84. My engine is about 75 #'s newer in production. Its harness plugs into the back of the relay panel. I appears the this car has the lamda brain and components under the seat. It was running an 86 twin plug crankfire engine before it failed and I purchased the car engineless. It may be that the previous owner at some time added this harness for the 86 engine. Its appears complete and unmolested. Can I ignore the lamda setup as my engine was not setup to run with it. Thanks Rob.

[flightlead404]

Originally Posted by mgro1959

Thanks again for input. My car is an 84 and I have a complete harness and engine from another 84. My engine is about 75 #'s newer in production. Its harness plugs into the back of the relay panel. I appears the this car has the lamda brain and components under the seat. It was running an 86 twin plug crankfire engine before it failed and I purchased the car engineless. It may be that the previous owner at some time added this harness for the 86 engine. Its appears complete and unmolested. Can I ignore the lamda setup as my engine was not setup to run with it. Thanks Rob.

Yes however I'd search for some old posts on here by billjam with some wiring diagrams that show how it all works and how to removed various bits and bobs. Very useful.

[Cornerlot]

My '86 930 has that same 14 pin connector by the DS shock tower. Its still plugged into the engine harness but it may be at least partially dead as the car now has EFI and Electromotive ignition.