Audi 80 V6 Help

[Matt86]

...this..... perhaps this is a vacuum leak issue related to the brake booster? The reason i suggest this is because when you start the car in park, your foot will probably be off the brake. When you change to N/D, you have to have your foot on the brake, and likewise when you try and move off you release the brake and from your description it sounds like you have the problem then too. If theres a crack in the booster diaphragm or something similar, that leaks when your foot is not on the brake but for some reason doesnt (or leaks less) when your foot is on the brake, it may account for the strange behavior.
I suppose to test its probably pretty easy, disconnect vacuum to the booster and block it so you are sure theres no leaks, then see if the issue is still there or not. Obviously I would suggest you dont actually drive anywhere though!

Just a thought.

Hmmm, I may look at this once I've cleaned out the throttle body and tried the other more simple things.

How does one go about disconnecting the brake booster anyway? I absolutely have no clue.

[Matt86]

Hmmm, I may look at this once I've cleaned out the throttle body and tried the other more simple things.

How does one go about disconnecting the brake booster anyway? I absolutely have no clue.

I shall take a video tomorrow morning if I remember to.

I'll put it on youtube tomorrow evening when I get back from Archery!

So I'm more bored then what I thought I would be... Gonna go for a quick drive to get some footage.
I figure it'll be easier to see the dash lit up now anyway.

Here we go, harder then what you think to drive with a phone in one hand!



As you can see putting it in gear makes it rev to around 1,500RPM and then it sort of "seeks" or stalls when I take my foot off the throttle.

Once it warms up however.. (Notice the temperature gauge)



It still does the "seeking" think when it's started to get warm but it's less and less jumpy the warmer it gets, stopping altogether at ~90c.

EDIT: Just realized I missed the main part! Doh' must have turned the recording off...

I'll grab that bit tomorrow before I leave. You can still get an understanding from those two videos to an extent.

[gldgti]

its quite regular.... interesting

[Matt86]

its quite regular.... interesting

It's still fine to drive.. It's been like that for a bit over a year now.

Unfortunately it's the only car I have so I can't set it aside to work on it/look at it for too long.

[jgribben]

Wonder who showed you that trick It could have carbon build up, id try some Fuel x through it, you can buy a bottle at bursons. Also does the engine fast idel when cold?? it could have a throttle body issue, need a clean and reset. There is a few things that can be checked there. At least you can say its only cold so all hot running problems can be ruled out.
Cheers
Jmac
ps ABC is a bomb proof motor

Haha it was good advice I'm just sharing around the knowledge. All credit to you.

[Matt86]

Alright so setting this problem aside for now....

Got some form of ticking from my engine right now...... Scary stuff.

[gldgti]

Probably nothing serious. Could be exhaust header leak or perhaps a tired hydraulic lifter.

[Matt86]

Probably nothing serious. Could be exhaust header leak or perhaps a tired hydraulic lifter.

Hmmm, it's only happened as of last night and i drove around 100k's home and to school today and it is fine. No performance loss or anything so far but it's really loud and it doesn't go away at all when it warms up.

Probably going to get a lift to school tomorrow....

How does one go about checking the oil pump? I think that's my first port of call, checking if the engine is actually getting oil? I don't know.

It's only happened last night as the weather got colder and it's been cold/rainy here all day... Maybe it's just that i need thicker oil when it's colder weather? (I read that on another forum) so it may be a silly idea.

[gldgti]

if it doesnt go away when it warms up, its probably a header leak.

If you had low oil pressure you would be getting low oil pressure warning light (assuming its working?). i.e. when you turn on the ignition without starting it, the oil warning lamp should come on. when you start the car it will go out if there is oil pressure.

if its an exhaust header leak you should be able to find it just by looking around in the engine bay while its running, and listening carefully.

[Matt86]

if it doesnt go away when it warms up, its probably a header leak.

If you had low oil pressure you would be getting low oil pressure warning light (assuming its working?). i.e. when you turn on the ignition without starting it, the oil warning lamp should come on. when you start the car it will go out if there is oil pressure.

if its an exhaust header leak you should be able to find it just by looking around in the engine bay while its running, and listening carefully.

Yeah I've had that on before when I used the wrong filter by what Ryco said being wrong.. (oil went everywhere) but I obviously isntantly stopped the car.

I recently got the oil sensor replaced too, the one that sits right above the sump plug as it had cracked and was leaking oil.

Gonna sound dumb, but what's the exhaust header? I've got limited experience with cars only being able to basic things. :p

Got a car minded friend (guy who sells parts) coming over to have a look soon with me..