Looking for wiring diagram for Audi 80/90 NG Engine

Colin Aitchison · 01-10-22, 06:02 PM

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.

Obli · 01-10-22, 08:55 PM

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?

Sandro · 01-10-22, 11:06 PM

This one is pretty in detail

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

Colin Aitchison · 02-10-22, 03:58 AM

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

Colin Aitchison · 02-10-22, 04:02 AM

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

John. · 02-10-22, 07:07 AM

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

Sandro · 02-10-22, 10:52 AM

Quote:

Originally Posted by Colin Aitchison

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

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

Colin Aitchison · 03-10-22, 07:51 AM

Sandro, 1700 pages

Colin Aitchison · 03-10-22, 08:33 AM

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.

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

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.

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.

Obli · 03-10-22, 11:45 AM

Quote:

Originally Posted by Colin Aitchison

Looking for more information on vacuum pipe work.

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.

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

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!

01-10-22, 08:55 PM	#2
Obli Grown up member Classic Audi Club Member Join Date: Jul 2010 Posts: 267	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?

01-10-22, 11:06 PM	#3
Sandro Grown up member Join Date: Feb 2011 Location: Chelmsford Posts: 651	This one is pretty in detail https://12v.org/urs/audi_90_electric...grams_1993.pdf

02-10-22, 03:58 AM	#4
Colin Aitchison Senior Member Classic Audi Club Member Join Date: Dec 2013 Location: Back home in Tillicoultry Posts: 1,315	Obli, since my first post I have found my own Haynes and was going to decipher it today, thank you for your help.

02-10-22, 04:02 AM	#5
Colin Aitchison Senior Member Classic Audi Club Member Join Date: Dec 2013 Location: Back home in Tillicoultry Posts: 1,315	Sandro, wiring diagram is spot on thanks, 260 pages, my head is going to be spinning.

02-10-22, 07:07 AM	#6
John. 4 ring whore! Classic Audi Club Member Join Date: Mar 2011 Location: Scottish Borders. Posts: 7,526	Hat off to you Colin, you're getting stuck into this.

03-10-22, 07:51 AM	#8
Colin Aitchison Senior Member Classic Audi Club Member Join Date: Dec 2013 Location: Back home in Tillicoultry Posts: 1,315	Sandro, 1700 pages

03-10-22, 08:33 AM	#9
Colin Aitchison Senior Member Classic Audi Club Member Join Date: Dec 2013 Location: Back home in Tillicoultry Posts: 1,315	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. In the photo below I am pointing at a small plastic union that connects directly to the inlet manifold, same car. 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. 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.