Bad starting 80 16v

Newbie Joined: Feb 15, 2003 Posts: 5 Location: u.k.

1992 audi 80 16v 6a Having trouble starting from cold, car fires but does not start unless throttle is pressed to floor, car starts fine when hot.

Newbie Joined: Jan 31, 2003 Posts: 10 Location: uk

im having exactly the same problem with my 80 sport 2 litre 8v.Does yours turn over then splutter into life like its running on three cylinders for a couple of seconds?Only does it sometimes when its cold

Posted: Sat Feb 15, 2003 9:42 pm

Sounds like a problem with your cold start valve need to get it cjecked out by an injection specialist

UltraUser Joined: Jan 30, 2003 Posts: 1743

Gday

Ihad exactly the same problem with my *) sport . Ichanged the cold start valve and thermo time switch but it made no difference. In the end it turned ou to be the warm up regulator. Fitted a secondhand one and it fired up straight away and has ran perfectly hot or cold ever since
Regards Gavin

Posted: Sun Feb 16, 2003 10:46 am

i think thats the small alley box on the air fillter, try takeing it off and giveing it a clean, if it start ok for 2 - 3 time then bugers up you know its that

UltraUser Joined: Jan 30, 2003 Posts: 1743

No, i think youre thinking of the metering head. The warm up regulator is on the engine itself. Right handside of the engine on the head itself. About midway from front to back. If i remember rightly it has one pushon electrical connection and two bango connections for the two braided fuel lines, 10 min job to change.
Regards gavin

Newbie Joined: Feb 15, 2003 Posts: 5 Location: u.k.

My car does sometimes start short of cylinders for a few seconds.

Inexperienced Joined: Jan 30, 2003 Posts: 23 Location: UK

I changed the injectors in my 16v because some were leaking. Starts much better now but still isnt perfect. Seems to start on 3cyls sometimes when warm starting. Once revved, it is fine.

Newbie Joined: Feb 15, 2003 Posts: 5 Location: u.k.

I think i will try the injectors first - i can get them cleaned and tested for £10 each.

Site Moderator Joined: Jan 31, 2003 Posts: 9144

This type of fault is often the multifunction temperature sender.

Newbie Joined: Feb 15, 2003 Posts: 5 Location: u.k.

The multifunction switch has already been replaced. Does anyone know where I can get a manual ?

Newbie Joined: Feb 15, 2003 Posts: 5 Location: u.k.

The multifunction switch has already been replaced. Does anyone know where I can get a manual ?

UltraUser Joined: Jan 21, 2003 Posts: 4230

I have a manual for this model in German, got it from Ebay Germany.
You are welcome to use it for the price of posting it to you. The earlier 80 manual covers 16v, they never made a manual for the B4 model. Evil or Very Mad

Newbie Joined: Feb 22, 2003 Posts: 3 Location: UK

Hi all, new to this so here goes !!
I have an ACE engined 16v with same fault i am fairly technical having rebuilt the head etc but i have no idea where the warm up regulator or multifunction sensor are !! can anybody help me pls ? Crying or Very sad

UltraUser Joined: Jan 21, 2003 Posts: 4230

Warm up reg bolted to the right hand side of block as you look at it, if not follow the 2 smaller fuel pipes from the metering unit that dont go to the injectors Evil or Very Mad

Newbie Joined: Feb 22, 2003 Posts: 3 Location: UK

ah ha you are a star, thank you !!

is the multifunction temp sender there too ?
i know im pushing it now !! Cool

Inexperienced Joined: Jan 30, 2003 Posts: 23 Location: UK

Sorry to disappoint you guys, but I dont think the 16v has a warm-up regulator, rather the cold enrichment is determined by the ECU and supplied by increasing the current at the differential pressure regulator. The main thing that the ecu reads from during warmup is the coolant temperature sensor, and to some extent the air flow potentiometer for acceleration enrichment when cold.

I think the warm-up regulator relates to older K-jetronic cars such as golf mk1's and older series Audi's. The 16v motor has a KE-Motronic ECU.

Site Moderator Joined: Jan 31, 2003 Posts: 9144

Differential pressure regulator and warm up regulator often get mixed and effectively perform the same function. Difference is the DFP is attached to the metering head while the warm up reg goes on the side of the block. Can't recall when the change happened but I think it was late 80s / early 90s.