forum.audiv8.com Foren German Audi V8 Forum Problems With My Friends Audi V8

Hi! i Have a friend who has an -91 Audi V8 with the 3.6 litre V8 and 4 speed automatic gearbox.

When he starts the car cold, it has problems starting, stops if you dont push the gas, the exaust gas is black/blueish. When the car is warm it starts without trouble if you tun off the engine and starts it right away. If you wait about 5-10 minutes or more it becomes hard to start it again, but this time te exaust gas is just black.

I suspect that it gets too much petrol in the starting moment, i have measured the tempprobe on the back off the right cylingerhead, according to my info that one is for the engine control. It sems to be ok, i had about 360 Ohms when the engine was about 90-95 degrees warm.

The car also "rocks" when you accelerate slowly, like it gets too much/too little fuel all the time. Hard to describe in english, im from sweden and i dont talk/write german...

I would like to check the Lambda Probe, but i cant find the connecting wires for it, havent cheched under the car though...

Does anyone know what the fault could be???

Best regards,
Björn Söderberg
Sweden

Hello

before i begin to write you must know that my englisch is not so fine .
I must think that the engine (all zylinder) are working ??!
The first to checked part ist the Air/Fuel sensor (Lambda) , I think that is the favourite problem . To test this one you must put out the connection wires from the sensor . The place is under the left ignition on the zylinderhead and the gearbox .
One wire has the colour in black and is lonly connector in the place .
The other one will be in white and it has two cable-connector in the same place .
The engine must be run ok or better then before...
The other one is the thempprobe ... i would take an other one (new) also you will think he`s ok . His colour is also white !

Check tis out and take the info in this Thread .

see you


PS: if you have a black or black/blue exaust gas the engine had too much petrol

Hello Björn,

I think the fuel pressure regulator needs to be replaced. Here is a link to my friend's webpage with the instructions on how to change it out:
http://www.geocities.com/cobramsri/Regulator.html

Make sure to unplug the fuse for the fuel pump and then try to start the car; this will remove the fuel pressure and keep the gasoline out of your eyes when you remove the part. Don't ask me why I know this

I hope this helps.

Regards,

- Jeremy

Hi again!

You Where right, after i replaced the fuel pressure regulator the car runs great again.

Thanks for the help.

heijsan björn,
jeg heter kai og jeg kommer fra tyskland. jeg kjøre også en audi v8, men en 4,2. hvor bor du i sverige? kjenne du Bengt-Åke linder fra falköping? han kjøre en audi 200 20v. jeg besøke han mange. jeg kunne besøke deg og den bil også. skriver meg en mail pa de forumet.

hilsen fra tyskland

post scriptum: unskyll men jeg snakker nur norsk. min tel nummer er 0049 173 7990027 eller sms