Injector wiring loom

[Penelope Stopit]

Any news on this?

[Olas]

I can see twoavenues of attack, neither of which will be especially desirable to you but bear with me;

Quickest/simplest/cheapest solution is Weber carburettors. IDFs or DCOEs depending on how much space you have.

Best long term solution is also the most costly - go Haltech.

[MisterTee]

Hi all

Making slow progress on this - a combination of too much (non-tvr) work to do and not enough time.

I’m just needing a couple of new connectors then I should be able to test out another loom to see if it cures my problems. Penelope has convinced me it is a loom/diode related issue, which based on all that I have read I tend to agree with.

RayTVR kindly loaned me a spare loom, but the main connector was different to mine on the car. I’ve managed to get another loom to call my own now and just need to get that fitted - must get your kit and loom back to you Ray (sorry)!

Anyone any ideas where I can get the ‘male’ connector to fit this? I’ve scoured various websites but can’t seem to find anything that looks remotely like it.

Not sure I will get to the car again for another couple of weeks now, as I work all week, have friends coming round next weekend and then a full week of work and on-call the week/weekend after (aaarrrgghh).

Still ....could be worse, it could be the summer!

Catch up again soon

Andy

[Penelope Stopit]

Been all over the internet this morning looking for a male 8 way plug to match up, no joy

Have links to housings that match the TVR housing, terminals plus lock strip can also be ordered, they're all shown on these pages

https://www.automotiveconnectors.com/9-way-lucas-r...


https://www.automotiveconnectors.com/9-way-lucas-r...

[MisterTee]

Many thanks Penelope - that is more helpful, actually.

I had been looking for this type of connector, as this is exactly the type fitted to the main loom. I was led to believe that it wasn’t a proper Ford or TVR fit connector which is what made me start my search for a male connector for the above. Below is a picture of the connector on my main ECU loom, which looks to be the same as the ones you have found.

Andy

Edited by MisterTee on Monday 27th January 21:48

[MisterTee]

Placed an order - hopefully they will be here by the weekend. Thanks again for your help!

Andy

[Penelope Stopit]

Ok then

That's explained why

Was wondering why you were searching for the Ford loom plug, recognised the above plugs as Lucas/Rists a while back but didn't think to mention it

Was a bit slow there, hope my lack of thinking ahead hasn't caused you too much grief

Good luck

[MisterTee]

So, armed with another loom and the right connectors (thanks Penelope), I’m about to start the process of changing the connector over on the loom to match that on the car.

What might be a really silly question (but this is a TVR, so maybe not); Are the wires colour matched like-for-like either side of the connector?

The reason I ask is that the pattern of the connector on the loom



Does not match the pattern of the connector on the main harness




Many thanks

Andy

[GreenV8S]

Why are the connectors different?

[MisterTee]

It’s a second-hand injector loom. The original loom, which worked absolutely perfectly but was scruffy with various hacks and bodges was ‘rebuilt’ and the car has never ran properly since. I suspect the rebuilt loom is dodgy, but I am trying to rule that out.

I’ve got another loom but it has a different connector and so want to swap it over.

[Penelope Stopit]

MisterTee said:

The pattern of the connector on the loom does not match the pattern of the connector on the main harness

This is correct, there won't be a match from the TVR loom to the Ford loom as the manufacturers do and have used their own chosen colour codes

TVR British colour codes to Ford German colour codes

Below image (taken from diagram on previous page) shows the 9 way plug and socket with the colour codes changing

Will be back later with a little more information that will hopefully assist in terminating

[GreenV8S]

MisterTee said:

It’s a second-hand injector loom. The original loom, which worked absolutely perfectly but was scruffy with various hacks and bodges was ‘rebuilt’ and the car has never ran properly since. I suspect the rebuilt loom is dodgy, but I am trying to rule that out.

I’ve got another loom but it has a different connector and so want to swap it over.

If the new OEM loom is the same as the one TVR adapted, the wiring on the engine side of the connector should have the same colours as the old loom. If they aren't the same, you have to question whether this is actually the equivalent loom.

[Penelope Stopit]

Holding the plug in the same orientatation as shown in the pin numbered image below

Please post the cable colours entering the rear of this plug from 1 to 8 as numbered



Have you fitted the loom?

What car/year did it come out of?

Edited by Penelope Stopit on Wednesday 19th February 16:35

[MisterTee]

Okay, here goes!

1. Brown black white dashes
2. Brown green
3. Brown
4. Brown green white dashes
5. Brown yellow
6. Black
7. Brown black
8. Brown

[RayTVR]

MisterTee said:

Okay, here goes!

Hi Andy

Just been out and looked at mine (1991 S3)

First thing is that my connector is the unidentified oval red one (like the one on the replacement loom) so it looks like the spare would be ok for my car if ever needed

I have the same colours as you on the engine side

1. Brown black white dashes
2. Brown green
3. Brown
4. Brown green white dashes
5. Brown yellow
6. Black
7. Brown black
8. Brown


The colours on the 'car side match as follows;

Car side	Engine side (i.e. injector feeds)

Brown/black	1.	Brown black white dashes
Brown/green	2.	Brown green
Brown	3.	Brown
Brown/green	4.	Brown green white dashes
Brown yellow	5,	Brown yellow
Black	6.	Black
Brown	7.	Brown Black
Brown	8.	Brown

Running alongside this connector is another single way connector (almost as if nine pins were needed but an eight way connector was used)

This is

Brown White

9.

Brown white

From memory I think the spare loom had this as a single shrouded spade type connector.



Hope this helps - let us know

Edited by RayTVR on Wednesday 19th February 22:39

Edited by RayTVR on Wednesday 19th February 22:45

Edited by RayTVR on Wednesday 19th February 23:24

[RayTVR]

Penelope Stopit said:

Below image (taken from diagram on previous page) shows the 9 way plug and socket with the colour codes changing

Don't think that's the same plug - that contains wiring to gauges so I think that's up behind the dash - The plug the OP is wrestling with isn't identified on the diagram and connects the injectors etc..

[MisterTee]

Many thanks for this Ray - very helpful.

I still have your spare loom and will get it back to you, along with your star tester and will get them back across to you.

I just need some half-decent weather so that I can get the car out of the garage to work on it. My garage is tiny and doesn’t give me sufficient access to work on the car inside.

Will let you know how I get on.

Andy

[Penelope Stopit]

RayTVR said:

Penelope Stopit said:

Below image (taken from diagram on previous page) shows the 9 way plug and socket with the colour codes changing

Don't think that's the same plug - that contains wiring to gauges so I think that's up behind the dash - The plug the OP is wrestling with isn't identified on the diagram and connects the injectors etc..

Correct, good post

Had done a list for that plug "what connects to what" and having seen another similar plug shown in the Ford diagram did wonder

Hence to save any confusion didn't post up the list, thought it best to number the pins and pop the question asking for what colours go to what pins

Good information here, this will help cut the thinking down

RayTVR said:

The colours on the 'car side match as follows;

Car side	Engine side (i.e. injector feeds)

Brown/black	1.	Brown black white dashes
Brown/green	2.	Brown green
Brown	3.	Brown
Brown/green	4.	Brown green white dashes
Brown yellow	5,	Brown yellow
Black	6.	Black
Brown	7.	Brown Black
Brown	8.	Brown

Running alongside this connector is another single way connector (almost as if nine pins were needed but an eight way connector was used)

This is

Brown White

9.

Brown white

From memory I think the spare loom had this as a single shrouded spade type connector

[Penelope Stopit]

MisterTee said:

Okay, here goes!

1. Brown black white dashes
2. Brown green
3. Brown
4. Brown green white dashes
5. Brown yellow
6. Black
7. Brown black
8. Brown

Lovely, needed this

As you can see from the table posted by RayTVR, there is nothing straight forward about terminating the plug due to there being colour duplicates as ???? marked below

Brown/black	1.	Brown black white dashes
Brown/green????	2.	Brown green
Brown????	3.	Brown
Brown/green????	4.	Brown green white dashes
Brown yellow	5,	Brown yellow
Black	6.	Black
Brown????	7.	Brown Black
Brown????	8.	Brown

Now need to check through some diagrams and will post back later with findings

In the meantime, can you verify that the car loom side cables colours match up with RayTVRs car loom side cables colours?

At least the terminal configuration in your replacement engine loom hasn't been messed about with, it matches up with the Ford plug and RayTVR's plug shown in a diagram below

[Penelope Stopit]

Using the following information found in these forums and the above information provided by RayTVR and yourself





As long as your car side plug cables colours match with RayTVRs car side plug cables colours

With the ECU Disconnected

You will need to check from the car side plug cables terminals to the ECU plug terminals with a multimeter, you need to be sure that all duplicate cables colours destinations are known and then labelled, obviously label the engine side plugs cables 1 to 8

There shouldn't be any need to check the following but it won't do any harm to do so

Pins 1, 5 and 6 cables aren't duplicated at the car side plug

Brown/black	1.	Brown black white dashes
Brown/green????	2.	Brown green
Brown????	3.	Brown
Brown/green????	4.	Brown green white dashes
Brown yellow	5,	Brown yellow
Black	6.	Black
Brown????	7.	Brown Black
Brown????	8.	Brown

As can be seen, 3 x Browns and 2 x Brown/greens are the problem

Below is a list that will assist you in checking car side plug to ECU terminations, haven't included every circuit the cables connect to as that will only complicate things

Included the pin numbers that the car side cables would connect to at the engine side plug, even though you'll be changing the engine side plug

Best that you match the engine side cables terminals orientation to the TVR side plug, if you were to alter the orientation of the terminals in the TVR side plug their could be a big problem in the future if someone fitted a TVR injector loom and plugged it into an altered plug

If you're not sure of anything.....ask, here's the list for car side testing and labelling

Pin 1 - Cable Number 31B-20 Colour BR-SW = Brown/black --------Connects to ECU Pin 26

Pin 2 - Cable Number 31B-13 Colour BR-GN = Brown/green -------Connects to ECU Pin 47

Pin 3 - Cable Number 31-75 Colour BR = Brown -----------------------Connects to ECU Pin 46

Pin 4 - Cable Number 31B-75 Colour BR-GN = Brown/green -------Connects to ECU Pin 7

Pin 5 - Cable Number 31B-73 Colour BR-GE = Brown/yellow -------Connects to ECU Pin 21

Pin 6 - Cable Number 15-6 Colour SW = Black -------------------------Connects to ECU Pins 37 and 57 and Main Engine/ECU Relay Terminal 87

Pin 7 - Cable Number 31-73 Colour BR = Brown -----------------------Connects to ECU Pin 58

Pin 8 - Cable Number 31-74 Colour BR = Brown -----------------------Connects to ECU Pin 59

Edited by Penelope Stopit on Thursday 20th February 17:52