Hi.

 

My first post here so apologies if I'm not on the correct forum, hoping you guys can help though please as I'm not getting much joy with Google!

 

I've a 2016 Superb, diesel, manual.

 

All good, no real issues for 80k miles but recently I've been losing acceleration intermittently whilst traveling at 60-70 mph. 

 

It's like my revs are being limited as I still have power and if on a flat or decline then I can maintain speed but any incline I'm falling back and the dash is telling me to drop to 5th, 4th etc but again my revs seem to be limited and I cant get any acceleration.

 

Sometimes it fixes itself if I drive through it but always resolves itself if I pull over, switch car off and back on again.

 

I've changed the fuel filter, air filter, put Injection cleaner and cataclean through it but no joy.

 

It's been happening for a few weeks now intermittently over probably a dozen incidents.

 

I've got no lights flashing on my dash and plugging it into a code reader gave me nothing, no codes logged.

 

Any help would be greatly appreciated!

 

Thanks all.

Variable vane turbo needs a Mr Muscle Enema.

16 minutes ago, Bensupreme said:

 

I've changed the fuel filter, air filter, put Injection cleaner and cataclean through it but no joy.

I've changed the fuel filter, air filter, put snake oil and other snake oil through it without success.

3 hours ago, Paws4Thot said:

I've changed the fuel filter, air filter, put snake oil and other snake oil through it without success.

Helpful, together with being wholly inaccurate. 

3 hours ago, J.R. said:

Variable vane turbo needs a Mr Muscle Enema.

Yep, certainly sounds like exactly the same issue a friend had on his GT TDI Golf. 

Thanks @J.R., appreciate your response. Seems like an easy job if I can find the right place to spray the cleaner. There's a few hoses I could release but not sure which one, I don't suppose you've any tips do you please? Thanks again.

 

Hi @Bensupreme

Did you get to the bottom of your issue? Having the same problem at the moment

Many thanks

Kevin

Try Forte Diesel Turbo Cleaner along with Forte Advanced Formula Diesel Treatment. I've had good results with it in the past. Pour both bottles in the tank, let car idle for 40 minutes and then take it for a drive.

You can get it on Amazon or EBay.

If you have an OBD dongle/app it would be easy to check if it was the turbo position using live data to record Boost Pressure, Boost Pressure Setpoint, turbo Vane Position etc.

Boost pressure faults are one of the hardest to diagnose and will take some time before DTCs will trigger because it's normal that the boost pressure takes time to build and it's not always possible to achieve the requested value depending on driving conditions, altitude, towing etc

I had the same problem with my last car, a Merc C200. After 5 years Mercedes were still no closer to finding the problem and it still existed when I handed it back.

No fault codes recorded and it never happened when I was in a position the take it into the dealer to witness. A switch off-switch on was the only way to reset it.