Moo Valve (N75) Replacement - Reduced RPM at Gearchange

[gatvol]

My 2012 DSG Bi-Turbo Cali had the dreaded Moo Valve (something to do with Turbo Pressures) problem at about 50k miles. Perhaps once or twice in a two hour drive there was a noise that sounded like a mobile phone vibrating inside the dashboard for about half a second. This tripped the van into "Limp Mode" a couple of times

So I had it diagnosed. The van was plugged into a computer and one or both of the Moo Valves were deemed to be faulty. I did not want to keep going back to the garage to get these fixed, so I had an independent specialist replace them both.

I have now noticed that the Van changes gear at 4,500 RPM in Sport mode. Under acceleration my Van always used to change gear at 4,500 in Drive mode, but at 5,000 RPM in Sport mode. I do not race the Van, but in testing out the new Moo Valves, I wanted to see everything was in order.

I saw the new Moo valves with my own eyes, these were genuine VW replacement parts. I retained their boxes and also the original valves that were removed from my Van. They all have the same part number so I believe that the correct and genuine VW parts were used.

Does anyone know what might have happened here please ?

Thank you

 

[rod_vw]

Might be worth a careful check of the pipes in the area around the valves.
By the way if you have the receipt for the valves they are covered by a two year warranty by VW as long as they were fitted correctly and are not physically damaged.

 

[WelshGas]

Maybe the Turbos are now being more effective and the engine is producing more power at lower revs hence the DSG is changing gear sooner? Just a half baked theory.

I know that mine changes gear, in Sports Mode, at about 4,500 revs, certainly not 5,000.

 

[Alan Andrews]

The DSG gearbox electronics are continually monitoring and adjusting, so the change may take time to filter through....i.e. the engine and gearbox still thinks that you have the old faulty valves.

You may need to do a reset of the DSG electronics.