Plug help

Posted: Sun Dec 15, 2013 10:57 pm

Could anyone help me with what this plug is, was having some trouble with the car running like rubbish and since disconnecting this its now running fine. The cars a 1991 audi 80 sport 16v

It plugs into here:

Posted: Tue Dec 17, 2013 1:33 pm

looks like a blank ing plug to me Laughing

Posted: Tue Dec 17, 2013 2:05 pm

Opps deletes the wrong images from my photobucket

Audi Nut Joined: Feb 04, 2010 Posts: 62

that plug is linked to the o2 sensor and adjusts fuel pressure when in closed loop mode by disconnecting it you have bypassed a faulty o2 sensor and the ecu is in a default mode check the lamda o2 sensor to confirm this there are three wires from it going to two seporate plugs the one you want to test is the one with only one wire check continuity to earth with ignition OFF should have no resistance if it has resistance then it is faulty cheers allan..

Site Moderator Joined: Jan 31, 2003 Posts: 9144

surely that makes it the fuel pressure regulator.

Posted: Wed Dec 18, 2013 10:20 am

Would be best to change the lambda sensor and poss the fuel pressue regulator then poor car looks sorry for its self just sat there lol.

Cheers for the help

Site Moderator Joined: Jan 31, 2003 Posts: 9144

on your picture, inside the red circle there is a hole.

What's that for because it won't be helping

Posted: Wed Dec 18, 2013 10:43 am

I thought that at first Mike then I thought hmm looks like it could be an edited black spot...

Posted: Wed Dec 18, 2013 10:50 am

There is a couple holes there that looks they have have been drilled was like that when we got it

Site Moderator Joined: Jan 31, 2003 Posts: 9144

I'd sort them out before replacing any lambda sensors.

There may have been a heatshield in the kit which either didn't fit or got removed - hence the holes. You need to bung them or replace the hose.

A better idea would be to remove the cone filter and return it to stock.

Posted: Wed Dec 18, 2013 11:32 am

can you post a zoomed out version of the pic as I am interested to see how the cone filter works with the fuel metering head..

Audi Nut Joined: Feb 04, 2010 Posts: 62

the holes in the plastic duct pipe will make no difference to anything as it is unmetered air also the cone filter is only show as wont work in that position and is a restriction ..allan

Posted: Wed Dec 18, 2013 3:47 pm

Posted: Wed Dec 18, 2013 6:22 pm

what has been put on the end of the exhaust gases testing tube? cant work out why somebody would put a filter on it as it should not be open to the air? normally the blue plug closes it up

Posted: Wed Dec 18, 2013 6:28 pm

The small filter? Looks like a cheapy crap from halfords like i say our mate was given it and didnt want it so just gave it to us everything that has been done on the car was done by the previous owner before my mate, it only got towed to mine and parked on the drive. Never owned an audi so no nothing about these cars

Site Moderator Joined: Jan 31, 2003 Posts: 9144

you need to remove that small filter and make sure the end of the pipe is blocked off

Posted: Thu Dec 19, 2013 8:34 am

Will do

going to have a proper look this weekend while ive got some free time