Hi, After my recent engine failure issues I've been looking at possible causes.

 

I have noted that on some engines , they oil pump is running at a lower pressure whilst the engine is at a lower revs. This has been seen to cause premature failures.

 

Can anyone tell me is this a "feature" of the 2.0 TDI engines used in our Superbs?

 

I have engine code DFHA of this makes any difference.

 

In my research of this, I actually came across a YouTube video , on a Mercedes AMG engine where this was an issue, it was as simple as unplugging the pressure switch so the pump defaulted to full pressure all the time, not causing a CEL, but it did show a fault when doing a diagnostic scan. 

 

Video I am referring to.

Yes that engine does have 2 oil pressures it can run at based on temperature, load and engine RPM.

 

Yes you can unplug that solenoid to make the car run in 'high' pressure mode all the time. If you choose to do this you will be over the moon to find out that it is not located inside the sump and is relatively easy to get to at the front of the engine. I can confirm there will be no dash warnings, only a stored code in ECU.

 

 

 

 

43 minutes ago, SuperbTWM said:

Yes that engine does have 2 oil pressures it can run at based on temperature, load and engine RPM.

 

Yes you can unplug that solenoid to make the car run in 'high' pressure mode all the time. If you choose to do this you will be over the moon to find out that it is not located inside the sump and is relatively easy to get to at the front of the engine. I can confirm there will be no dash warnings, only a stored code in ECU.

 

 

 

 

 

That's super ! I really appreciate the information. Could I ask do you have a diagram with the location?

 

Is this something you would consider yourself?

 

Edited 29 December, 20241 yr by defsix

2 hours ago, defsix said:

Is this something you would consider yourself?

 

It is something I considered when I got a fault with the solenoid. I tend to overthink things though and for fear of causing other issues from operating the oil system other than intended and the lack of evidence to suggest that its a problem I made the repair.

 

You have to take the aux. belt off, unbolt the AC compressor and its right behind. It literally looks exactly the same as in that video. I can't remember whether you can get to the connector without taking the compressor off but to  remove the whole thing you have to.

Edited 29 December, 20241 yr by SuperbTWM

I am currently in the middle of replacing my engine after an oil starvation. So everything is completely accessible 😁.

 

I'm definitely considering this option.

 

I've heard of this oil issues with several of the VAG group cars. I'd I'm not mistaken it was as issue with this 3.0TDI A7 

 

Saving Salvage A7

Can I ask how you have come to the conculsion it was oil starvation? Considering how many of these engines there are out on the road, personally, I think if there was a design flaw it would be common knowledge

There's no definite proof as of yet. But the big end bearing has failed at 120K Miles which sounds very early. Dealer serviced up until I purchased, then serviced every 6k Miles then. 

My mechanic believes it's also some kind of starvation too.

Is this also a TSI known issue, or only affected TDI engines?

I've only looked on the Diesel side. But the video I linked to in my first post was a Mercedes AMG Petrol.

Engine busted? Anything can be done to prevent it?

My Engine is gone. Turbo appears ok. Minor play. Nothing to suggest oil starvation to the turbo. We will investigate further as the job proceeds.

Unbelievable.... Pls share further info about this

Have a look here  for my initial issues and the outcome.