Audi A4/B7 - Circulation jumping

[alecoder]

Hi,
I have got 2005 Audi A4/B7 - it has a problem when it is cold it does something like this:

https://youtu.be/_PGw_ckHAYw

I have replaced spark plugs, air filter, petrol filter but it still happens. Have you ever had similar problem ? What do you suggest to do ?

[Andrew149]

Do you have front wheel drive or auto?

[alecoder]

It is AWD/Tiptronic/2.0 TFSI

[fly300kts]

http://www.audizine.com/forum/showthread.php/403833-Strange-Behavior?highlight=rpm+fluctuations

Phil

[alecoder]

Hi Phil, Thank you for the response.

When car is cold, a high pressure fuel pump is wet with fuel at the top. May it is cause of this ?

[Mlambrecht17]

More than likely it's your torque converter, the rpms fluctuate when the tranny fluid is cold, is does it for only the first 5-10 minutes of driving right? It should warm up and go away, also it doesn't do it when temps are just above 65° I have noticed. I took mine to a very reputable euro shop to figure it out, it's about 2500$ to repair, also, they told me that 90% of b7s do this, but only half of the people really notice it, I've learned to just live with it, I'm gonna try changing the ATF fluid soon, but that won't change the torque converter issue. It is my mistake of buying this car, it's my first audi, I should have done more research on it, lesson learned, from now on buy a manual, but good luck!

[alecoder]

Hi Mlambrecht17, Thank you for your answer.
I changed ATF one half years ago but the problem did not fix. Yes you're right, RMP jumps when the car is cold. after 30 minutes problem goes away. Diagnostics did not show any error. therefore i can't understand what exactly this does. I'm going to replace some parts but i can't spend 2500$ to replace torque converter. I'll sell the car if problem is not fixed.

[fly300kts]

Hi Mlambrecht17, Thank you for your answer.
I changed ATF one half years ago but the problem did not fix. Yes you're right, RMP jumps when the car is cold. after 30 minutes problem goes away. Diagnostics did not show any error. therefore i can't understand what exactly does this. I'm going to replace some parts but i can't spend 2500$ to replace torque converter. I'll sell the car if problem is not fixed.

Did you check your ATF level since you replaced it?

Phil

[alecoder]

Yes Phil I did. but i'm going to check it again. Should it be cold to check ?

[fly300kts]

Yes Phil I did. but i'm going to check it again. Should it be cold to check ?

Because you ask this question, I think you might have found your problem:
To check the level, the ATF temperature is really critical. Read my DIY

http://www.audizine.com/forum/showthread.php/414061-B7-A4-Tiptronic-ATF-Replacement

Phil