Looking for wiring diagram for Audi 80/90 NG Engine
 

Hi all, looking for 1991 Audi 90 (10v NG preferred) wiring diagram, I would imagen Audi 80 would be the same. Struggling to connect wiring loom on to the fuse box, still have several wires without a home, may not even be used but any help would be helpful.
Thanks in advance.

I have a Haynes manual that has various wiring diagrams. Sadly, I'm without the manual for a few days. Would it help you Colin, or are you looking for a different format?

This one is pretty in detail

https://12v.org/urs/audi_90_electric...grams_1993.pdf

Obli, since my first post I have found my own Haynes and was going to decipher it today, thank you for your help.

Sandro, wiring diagram is spot on thanks, 260 pages, my head is going to be spinning.

Hat off to you Colin, you're getting stuck into this. :)

:D
I'm diving into V8 diagrams today (1,700+ pages) to find a little gremlin :(

Sandro, 1700 pages:yikes:

Looking for more information on vacuum pipe work.
In the photo below I am pointing at small vacuum pipe connection on side of throttle body, the car is an Audi 90 quattro with NG 10v engine, the distributor has no vacuum advance on it.

http://i.imgur.com/g053jzu.jpg

In the photo below I am pointing at a small plastic union that connects directly to the inlet manifold, same car.

http://i.imgur.com/bnOkgaQ.jpg

In the photo below I think I have found the diff lock vacuum pipe and have indicated its route through the engine bay in red circles, white plastic pipe that comes through a grommet behind the battery, but not got any clue where it connects to, I have attached it to the small plastic union that connects directly to the inlet manifold as it does reach that point.

http://i.imgur.com/jnW6BIs.jpg

Any help will be much appreciated, this will sound daft but not looked at the underside of bonnet too see if there is a vacuum pipe layout, as there is on some other cars.:shake:

Hi Colin. I'm not going to be much use! Not familiar with the NG but all I was going to suggest was to look for a diagram under the bonnet :smilewinkgrin:

I only noticed this sticker in my 7A recently, after 20+ years of ownership!

Not sure what your issue or intention is but one of the vacuum leaks I had was due to one of those plastic caps (yours is green) with a hole rotted in it!

Thanks Obli,

More Questions, does the NG engine have a lambda probe in the exhaust? not found the lambda probe as yet but the wiring loom does have 2 pin plug for the heater in the lanbda probe and a single wire connector for the signal, CAT or link pipe missing, I am presuming the lambda probe if any screws into a threaded fitting on the CAT.
Any help greatly appreciated, thanks in advance.

I ran a FWD NG engine Coupe for many years and over 100K miles, it was the car that converted me from running VW's to Audi's, they go quite well as long as all the senders are working and you don't have any vacuum leaks etc.

Anyway, yes they have Lambda sensor located on the engine side of the Cat.

My uncle has a 2.3E Coupe, fwd, so presumably NG. H plate I think. He said it doesn't have an ECU - is that right? Surely the data from the sensors is being sent somewhere.

NG engines have a basic ECU along with KE-Jetronic engine management. Some early B3 Coupe's use the KV motor which is simply K-jet though they're a 2.2.

From what I have seen, K Simmonds, you are correct, the car I have has the dash removed, found the two ECU's on the back seats with large plugs on wiring loom, don't know where or how they fit to the dash or fire wall, but I will work it out when refitting dash.

I seem to recall the ECU for the motor goes under the carpet at the top of the passenger foot well on the B3 Coupe with an NG motor, I'd imagine it's somewhere around there on the 90Q.

There will be two box's under the rear seat, the large one is an ABS brake control unit the other one with the vacuum pipe work is for the diff.

Yes, you are correct the large plug for the ECU is around that area.

The ECU on my 7A (early rev, Hitachi ECU) is up in the passenger footwell, behind the glovebox. It slides down from within a carrier. Yes, I have the ABS controller under the rear seat too. Replaced it (which fixed an ABS light that was always on).

I also have a 7A 20V in my B2 coupe GT that I did the conversion work on and placed the ECU in the same place, the B2 coupe has rust problems and is on the list of things to do but could be a year or so before I get round to it.

Yes, but the problem was found - happy days! :cool:
The diagrams were well organized, I found the info I needed in around 15 mins

I love it when a plan comes together, well done.

Hi Guys, update on 1991 Audi 90 quattro, engine now running, Cat missing, so need to fabricate pipe work between down pipe and exhaust system, front end needs to go back on and full dash needs refitted, car will be moved under its own steam this weekend and will be up on 2 post hoist for access to exhaust and bleeding of full braking system.

Good to hear Colin, even if it was destined to have 20 valves !?
When you say "fabricate pipework" I'm thinking you're not fitting a cat?

:tup:

You are correct John, No pussy.

Just an update from today's work, car now on 2 post lift, I have had time to look round underneath the car and not too bad, front wish bone bushes are a little soft, rear bush on diff needs replacing, not knocking just really soft, fuel lines will need to be replaced as soon as I can, rear subframe needs some TLC due to rush, ok just now but it's not going to get better, exhaust will be done tomorrow and lambda bung will be fitted at same time, then bleeding brakes and front end back on, photos to follow.

Looks like the car is in good care with you, Colin :tup:

Did you say you might put a 7A in it, or are you keeping the NG?

Cheers, James

Hi James, fitting a 20v 7A into NG engined 90 quattro, the last owner of the car had that in mind.
For some time now a couple of guys on the form had known where this car came from and to be honest, I was not comfortable at disclosing who owned the car previously, until now, due to the timeline of events that happened for myself to become the next owner.
Sadly, I lost a very old friend in May of this year, Mike Dewar (MIKE2) on the forum, he died from a heart attack working on this very car and was found in his pit below the car, after his funeral all went quiet, his family, from Glasgow, as I believe it had no interest in his cars, I was asked on the form if I knew where, or what had happened to his cars, but the answer was not a clue, that all changed one morning when I received a call from friend that knew Mike and his cars, just after 9am, he had spotted one of Mikes cars and noticed the name of the seller, I believe this was on Facebook, the car was for sale with many many spares in a local recovery garage some 6 miles from me, after a quick phone call a visit was arranged and around 10am the same day, a handshake was made on the car and the spares.
Mike had most of the parts if not all to convert the car from a 10v NG to 20v 7A, and had started the work, at the time of purchase the car had only the back seats fitted in it, front seats, dash, front end, NG engine and 10v wiring loom had been removed and the 20v engine wiring loom already fitted with just the 20v 7A engine to be fitted.
To be honest I thought the car would be a better seller if it was original with the 10v NG engine (less paper work), so Mikes plans were reversed, with the 10v wiring loom refitted and engine back in the engine bay, it now runs, the dash is still like a spider's web of wires, but it moves under its own steam, it's been a bit of a challenge due to the fact that I never worked on or owned a NG engine car and had to find all the part for the 90 quattro in boxes of spares from many cars, but the basic 5 cylinder knowledge that I have has helped.
As for his other car, 911 Porsche sold for a song, his other Audi, still no clue, but they will turn up at some point.
Will the car be for sale, not at this point in time, I think I will hold onto it for now.

Well said Colin and it's good you now own this car.

Regarding Mike's 90 quattro sport, I believe it will be in good hands and yes it will appear at some point.

Nicely put Colin.

I got to know Mike a little through these forums and remember him from the Audifans days. Was so sad to hear of his passing. My car wouldn't be where it is without his help; directly and because of his contributions to the community over the years.

I'm glad that one of his cars has ended up in good hands. Mike will be pleased to see that too.

I'm glad you got the car Colin, it was very sad to loose Mike, I didn't know him all that well but we had been chatting via PM not all that long ago.

Anyway, I'm sure he'd be happy to hear you've now got the car running again.:nod:

Thanks guys, would still rather have Mlke than his car:sad:

Just read through this. I bought a 90 quattro off Mike last March and popped in to grab a few spares a few weeks later when I was coincidentally nearby with work. He had the 911 in the garage and was full of plans including the 20v swap.

A really nice man, very helpful and an encyclopaedia of Audi facts. I feel a weird attachment to the car and every time I do a little job or remove something I know he fitted I sort of wonder what he'd think - and I only met him twice!

I look forward to seeing what you get up to on this one - and I'll keep an eye out for the red 20v reappearing somewhere - I'm sure he said it had done about 300k miles!