BMP consumes too much resources.

Hello,

Despite various other "issues," I'm still bothered by what I perceive as excessive fuel consumption of my Passat (BMP with DSG).


Can we possibly interpret something from this log? I suspect it's running too rich, but if so - why? Is it possible that the lambda sensor reports excessively high values?
In the steady-state operation, Lambda can even reach 25 or so - is that normal?

I'm looking forward to any tips.
Greetings
Roland

Hello,

Lambda at 1.3 under full load is ok, as are the high values at low load:
/viewtopic.php?t=26448

However, the backpressure in your DPF seems a bit high, and it would be useful to compare it with other engines. Ash mass?

Best regards, Rainer

In April, Baba wrote

Quote:

My DPF is now showing 61g of ash

If he didn't do anything, then the thing is fine.


It's my fault, because who would do something like this:

Quote:

Diesel Particulate Filter (DPF) mileage approximately 155,000 km, engine mileage approximately 50,000 km (estimated)

If I remove the engine at 105,000 km, will I ALWAYS have to replace the DPF!

m;

Hello again,

Quote:

If I remove the engine at 105,000 km, will I ALWAYS have to replace the DPF!

Of course, I had also envisioned this - but it is clearly not a requirement at VW. The engine replacement (including the turbo) was ultimately carried out under warranty.

Quote:

If he didn't do anything, then the thing is fixed

.

He has done something, providing a great guide - but the success...

It would be great to have an actual comparative value for the differential pressure. At least, before the "DPF cleaning", the value at idle was much higher, and at full load, it was also somewhat higher, exceeding 350 mbar...

What about consumption? What if the lambda sensor sends incorrect values to the control unit, could this potentially result in a rich mixture, and could this explain the smell of the exhaust gases (not always, but often also shortly after engine start)?

Are the high temperatures before and inside the DPF still within the normal range during normal driving?

Quote:

Mixture to fat,

Mix ?? You have a diesel!
If too much is injected, it will stall.

If you had contacted me 2 weeks ago, I would have had a BMP available for testing.

In the operating mode, your lambda value is simply not defined, as there is no fuel and no calculated air-fuel ratio.
Before you start searching for pseudo-scientific solutions based on half-truths: Read a book, learn how diesel engines work.
In itself, this diesel mechanic has said everything there is to say about the book, which makes reading it much shorter.

Hello,

@matthiasTDI96 - Sorry, the term "mixture" was probably a bit misleading
I would be interested in seeing some comparative values, and whether it is even possible that the cause of increased fuel consumption (+ soot production) could be a faulty lambda sensor.

I just thought that this forum provides useful support to someone who isn't an expert, especially when dealing with "half-knowledge" or even less.

As far as I know, the ECU doesn't really care what the lambda sensor is saying - at least as long as it's not completely out of control.
Here (Diesel) nothing is lambda-regulated.

m;

It also doesn't mean that no one is offering support. However, the responses that are given must also be read. The mixture and air-fuel ratio are primarily irrelevant to the diesel engine.