Exhaust Gas Recirculation Valve

[Stuart_D]

Share your thoughts and experiencies!

http://www.audi-a2.co.uk/moo.htm

[img=left]http://www.a2forum.net/stuart.gif[/img=left]Stuart Diamond: (mailto:Stuart@Audi-A2.co.uk) A2OC Founder | Forum Administrator

2001 TDi SE: (http://www.audi-a2.co.uk/uk1.htm) Cobalt Blue Metallic | Open Sky Roof | Kenwood Mask CD | Front Centre Armrest | Front Centre Tray

A2OC Website (http://www.audi-a2.co.uk/index1.htm) | A2OC Merchandise (http://www.cafeshops.com/A2OC) | A2OC Forum (http://www.a2forum.net/forum/default.asp)

[weathermanint]

At last I know what it is - I thought it was just me!

http://billinge.weather.users.btopenworld.com/audi.JPG

Audi A2 TDI SE Azure Blue with Climate Control

[mott]

Cow noises under the bonnet!
I am the owner of an A2 TDI SE and I am experiencing the cow noises under the bonnet. I have only had the car for three weeks and the noise is getting progressively worse. I took the car to Lancaster Audi in Manchester and they had the car for a week and said that the noise was normal and that nothing could be done. I then rang Smith Knight Fay in Stockport and they said that they could do a mod on the valve, the car in now booked in for next week for them to carry out this work. I will let you know how I get on, and if the cow noises stop!

[Kaine]

Hi Steve (Mott),

Welcome to the forum. I would be interested to know what exactly they are going to mod. Could you try and find out what they did? Thanks

Kaine

[maersk]

Mine went away on their own.
I don't have free milk now but there is more room under the bonnet.

images/icon_smile_cool.gif

[Stuart_D]

Mott - welcome to the forum.
After you car has had the work done at Stockport, please can you try and find out from them exactly what they did so that each of us can try and get it done at our dealers?

Also, is it being done under warranty?

[img=left]http://www.a2forum.net/stuart.gif[/img=left]Stuart Diamond: (mailto:Stuart@Audi-A2.co.uk) A2OC Founder | Forum Administrator

2001 TDi SE: (http://www.audi-a2.co.uk/uk1.htm) Cobalt Blue Metallic | Open Sky Roof | Kenwood Mask CD | Front Centre Armrest | Front Centre Tray

A2OC Website (http://www.audi-a2.co.uk/index1.htm) | A2OC Merchandise (http://www.cafeshops.com/A2OC) | A2OC Forum (http://www.a2forum.net/forum/default.asp)

[deheld]

Never heard a single bovine noise on my LHD A2. Maybe it's a RHD thing ??

Dennis de Held

Amulet Red 1.4 Tdi

[Foghorn]

I have the 'mad cow' noise - but not all the time. The inly time the moo starts is when I'm in a long traffic jam (think M6) when I'm contiually stop - starting. After about 30 mins of this type of driving the cow is unleashed every time I set off from rest. However it disappears again after a long run.

On another point something has started to rattle again behind the dash - this time it vibrates when I start off!! Another trip to the dealer I think. Mott - might see you at Lancaster Old Trafford?

Regards - The Foghorn

2001 TDI SE Atantic Blue, Open Sky, 16" 6 spoke alloys, Satellite cloth & space box system. The "Dogs Twitchers"

[daveyjp]

I'd like to know too. Mine does it intermittently. Car was bought from Leeds, but I'd be willing to travel over to Stockport if they have a fix, even better get to know what Stockport do and I'll relay this to Leeds. Autoexpress said it was the clutch, but my extensive testing proves this is not the case.

[tikki]

We've had our 1.4TDI for 10 days now and I've got to the stage where I choose to drive the A4 because the mooing sound is driving ne MAD!![}:)]

The noise occurs just about every time I depress the throttle. I'm sure when we bought it, it was only intermittent and fairly quiet. Now, It's just about every time we use the throttle and VERY LOUD!

The dealer we bought it from is going to investigate next week.

I hope they can cure it because "that noise" just puts me off driving it!

[29]
tikki

A2 1.4TDI SE - 108 BHP - Pine Green
A4 1.9TDI SE - 137 BHP - Black with Cream Leather

[A2day]

I have a similiar problem but it look like a 2ton cow running inside the engine! :-) LOL
At 3000 rpm, in 5th gear, climbing a hill if I depress tottaly the throttle the engine starts to roar, the dash and gear stick start to vibrate real bad.
I will go to my dealer next 22nd.
This happens at all temperatures (inside and outside), and since the day I bought the car...
It has 14.000 Km now...

Cheers,
A2day

Speed doesn't kill... sudden deacceleration does!
http://clientes.netvisao.pt/ruimiguelp/small1.jpg Audi A2 1.4 TDI
See it > http://www.audi-a2.co.uk/europe26.htm

[vinnyk]

Mine mooing cow is gagged after i took mine to Listers Audi of Coventry. They moved and re-routed the pipes and this valve thing to somewhere else and I am now enjoying quieter motoring.

[mott]

Sorry it’s taken so long to get back to you all. The car was booked in Wednesday 9th July and they have fixed the mad cow noise. They carried out the repair under warranty so it was a free fix. To sort out the problem they changed the pipes from the EGV valve from plastic to rubber, so this stops the vibration from the valve. The mad cow noise has gone completely and the engine is relatively quiet now, Smith Knight and Fay in Stockport were very helpful, the car was booked in at 8am and was ready for collection at 12 noon. I will monitor it now and let you know if the mad cow noise comes back, but I don’t think it will. Bye for now! Steve

[rubbish]

Just got my EGR valve fixed at Hartwell AUDI in Warrington

[Stuart_D]

mott - using the details you provided on the solution you had fitted, my A2 is now booked in for this Thursday. So fingers crossed that this is the fix!

[img=left]http://www.a2forum.net/stuart.gif[/img=left]Stuart Diamond: (mailto:Stuart@Audi-A2.co.uk) A2OC Founder | Forum Administrator

2001 TDi SE: (http://www.audi-a2.co.uk/uk1.htm) Cobalt Blue Metallic | Open Sky Roof | Kenwood Mask CD | Front Centre Armrest | Front Centre Tray

A2OC Website (http://www.audi-a2.co.uk/index1.htm) | A2OC Forum (http://www.a2forum.net/forum/default.asp)

[Stuart_D]

My A2 went was with my dealer all day today.
They said that they chose not replace the pipes but instead fitted a new EGR valve which came 'modified' from the factory. Not sure how exactly it has been modified, but I didn't hear a single moo all the way home, so I guess only time will tell how effective the new valve is.
The good news is that it was all done under warranty.

[img=left]http://www.a2forum.net/stuart.gif[/img=left]Stuart Diamond: (mailto:Stuart@Audi-A2.co.uk) A2OC Founder | Forum Administrator

2001 TDi SE: (http://www.audi-a2.co.uk/uk1.htm) Cobalt Blue Metallic | Open Sky Roof | Kenwood Mask CD | Front Centre Armrest | Front Centre Tray

A2OC Website (http://www.audi-a2.co.uk/index1.htm) | A2OC Forum (http://www.a2forum.net/forum/default.asp)

[tikki]

Thanks Stuart!!

I don't know if my 'Moo' is typical or not but it has got progressively louder over the last two weeks. It is now VERY noisy and occurs every time the throttle is depressed.

This week, whilst doing about 3700 rpm in third, accelerating away from a roundabout, I had a sudden loss of power. The engine still ran OK but there was absolutely no acceleration. Speed dropped from 70 to around 40mph when climbing a hill a few hundred yards further on. Stopping the engine and re-starting it cured the problem but, the same thing happened several times that day.

Looking on another forum, several contributors complain of the same problem with 1.9 VW/Audi TDi engines. The sudden loss of power is caused by the Turbo cutting out. In each case, changing the EGR valve has cured it

Has anyone else had this sudden loss of power??

tikki [30] [21]

[tikki]

Three weeks ago my local dealership diagnosed and ordered a new EGR valve.
Today I took the A2 in to have this fitted, plus another warranty job.
The 'moo' is still there and the Turbo still cuts out when the car is 'pushed'.
The car is booked in for several days at the start of next month to sort the problem out:(
Could the new EGR valve be faulty? [21]

Has anyone else experienced their turbo cutting out ??

tikki

[Stuart_D]

It could be faulty...the last time I had the EGR valve replaced (about 18 months ago) the noise came back within a few days. This time it seems 100% cured, no sign of any noise yet.

[img=left]http://www.a2forum.net/stuart.gif[/img=left]Stuart Diamond: (mailto:Stuart@Audi-A2.co.uk) A2OC Founder | Forum Administrator

2001 TDi SE: (http://www.audi-a2.co.uk/uk1.htm) Cobalt Blue Metallic | Open Sky Roof | Kenwood Mask CD | Front Centre Armrest | Front Centre Tray

A2OC Website (http://www.audi-a2.co.uk/index1.htm) | A2OC Forum (http://www.a2forum.net/forum/default.asp)

[RTV]

I've never heard my 2002 A2 moo. It would seem that from this thread that the Moo is not inherant to the car but a problem which occurs on some and which can be cured on others. Is it possible to amend the Mooing section on the front page. This article recently put off a person who was otherwise interested in my A2 which was for sale. The fact mine has never mooed was no consolation after Reading the article on here.

2002 TDI SE - Silver - Open Sky System

[Kaine]

Hi RTV,

I never heard the moo sound for over 1 year. Strangely enough it appeared the first time just before meeting up at the first A2 social. My wife and I thought it was coming from someones elses car as it sounded like a subwoofer turned up loud (suprise suprise), however I quickly realised my foot was doing all the beats. Strangely, it only happens now and again in our A2, usuually after a long drive (over 1 hour).
Also, the moo isn't actually that bad I dont think. I wouldn't let that stop me from buying another.

Kaine

[swiv]

Okay, this thread has left me wondering.

I would think that my 2003 TDi would not suffer from this problem, but since I do think that I hear some abnormal side-effects under certain circumstances, I'd like to know more about this.

Could anyone confirm that my description below does NOT match the 'moo'?

Description:
"What I hear is a sound that is (IMHO) best described as a small airplane chasing the A2, thus more like a vibration. I hear it whenever engine RPM is between 2600 and 3000. It is most pronounced when coming from higher RPMs and while letting go of the throttle to slow down. But it can also be heard when just cruising at those rpms, in virtually any gear."

Not really a moo. The 3-cylinder roar above 3000 rpm is more moo-ish than this, but now I'm just curious. Will follow up with my dealer too, of course.

Thanks, Edo

[Kaine]

Thats not the moo. The moo happens when you just start to depress the accelerator - it goes away within a second or so. When it starts to happen you can pretty much control it, i.e. make it happen when you want.

Kaine

[tikki]

The A2 went in today today to sort out the 'moo' and cutting out of the Turbo.
The problem was traced to a loose joint on a hose or pipeline somewhere!!! - Sorry I can't be more specific, I should have paid more attention! [:I]

Anyway, the turbo problem is fixed. When I picked the car up, I was told that the moo was still there but only occaisionally. They're right - I think I can probably live with it if it doesn't get worse.

At least I had the day to compare my 1.4TDi with the courtesy 1.6FSi - I now know I chose the right engine! [24]

tikki

A2 1.4TDI SE - 108 BHP - Pine Green Pearlescent | Climate | Front Centre Armrest
A4 1.9TDI SE - 137 BHP - Black with Cream Leather

[Simmo]

Tikki,

I notice from you sig that ur A2 has been 'chipped'. Did you make the dealer aware of this when you took you car in or did they notice/mention anything to you in their search to cure your car's problem? The 33BHP hike in power surely would have been noticeable to them if they drove it or something would have shown up if they had run diagnostics to find your engines ailments?

2002 A2 TDI, Azure Blue, Symphony II, Bose, Satellite Cloth

[tikki]

I'd only had the car chipped a couple of weeks when the turbo started cutting out. We thought it might be a problem with the chip so the installers removed it. This didn't cure the problem so we took it into the dealers to find the cause.
The chip hasn't been replaced yet so it was standard when they worked on it. To be perfectly honest, even though it is a large increase in BHP, it isn't really noticeable except for mid range acceleration and less frequent down-changes for inclines.

I do wonder whether it would have shown up on diagnostics - the superchip installer says it wont!

tikki

A2 1.4TDI SE - 108 BHP - Pine Green Pearlescent | Climate | Front Centre Armrest
A4 1.9TDI SE - 137 BHP - Black with Cream Leather

[neilp]

My A2 TDI has been in the dealer's for two days for them to try and fix this and they've come back with nothing, good to find some info here so I can phone them back tomorrow and tell them what they need to change!!

They did manage to damage the car while it was in there (large scrape on the rear arch), they've said they'll repair it FOC but do I just accept that or ask for something else?

Cheers

Neil

[runboy]

neilp
Welcome.

Sorry to hear of your problems. The mooing sound should be fixed-Audi dealers have managed it so far.

As for the damage, the repair goes without saying, but it may be worth getting written confirmation from them as to how it happened. If you sell the car elsewhere in the futre and some picks up on the repair they may think it was a more damage than a scrape so the letter should go some way to proving it was just a minor repair. And maybe a set of floor mats or something!!!

Steve - 2002 1.4SE petrol, Silver, black/black interior, Then an identical replacement 2003 A2. Now a Toyota Corolla 1.6 T-Spirit

[daveyjp]

My car does the 'mooing', but I'm waiting until service to have it done. I've printed off these pages and will be showing them to the dealer so they know what to do. As for the damaged car I'd be looking for at least one free service.

[Stuart_D]

Since I had the new 'modified' version of the EGR valve fitted to my A2, I have driven about 1,500 miles and the cow has not returned. It was definitely the solution to the problem. I'll try and find out the part number and post it here.

[img=left]http://www.a2forum.net/stuart.gif[/img=left]Stuart Diamond: (mailto:Stuart@Audi-A2.co.uk) A2OC Founder | Forum Administrator

2001 TDi SE: (http://www.audi-a2.co.uk/uk1.htm) Cobalt Blue Metallic | Open Sky Roof | Kenwood Mask CD | Front Centre Armrest | Front Centre Tray

A2OC Website (http://www.audi-a2.co.uk/index1.htm) | A2OC Forum (http://www.a2forum.net/forum/default.asp) | Support the A2OC! (http://www.audi-a2.co.uk/support.htm)

[Shaf]

In my experience the 'mooing' only occurs if I've been sat in traffic for some time, especially during the hot summer and then I set off. As the clutch comes up there is a 'moo' or as I explained it to the dealer, over 18 months ago, a 'gulp' 'gulp'. Not had mine rectified, just got used to it I don't even notice it now.
Shaf

Nov 2002 TDi Sport, Silver,Black/grey interior,climate. Replaced previous Mar 2001 TDi SE

[chivers]

My TDi went "moo" too but my helpful dealer cured it with a new EGR valve.

In my car you could hear the noise more from the right hand front seat, but not from the left-hand side. I think Dennis is right: it's a problem with RHD cars because that's where the owner sits.

Chivers ':)'
'02 A2 1.4TDi SE