Kaltstartprobleme bei niedrigen Temperaturen, 2.0TDI | Posts 32+

Okay...

Since everything seems to be in perfect order with the DPF, the problem must likely lie elsewhere.

Does anyone have any other ideas about what might be wrong?

What's noticeable is that the starting problems get worse as the outside temperature decreases.
The colder it is, the harder the engine has to work.
This morning, for example, it wouldn't start right away. It only started on the second attempt.

Hello!

I haven't read everything 100% yet, but a quick question: Are you sure the engine is shutting down because it's running poorly, or could the WFS be deliberately shutting it down?

Best regards,
Dirk.

If the WFS is active, the FIS would report it in the same way.
Errors are also not stored in the error memory.

On the second attempt, it usually starts up, although it initially runs very roughly for a few seconds.
So, it seems WFS is out.

Stefan_2.0TDI wrote:

System almost completely free of air bubbles (a few are normal)

I still think this is the most promising lead.

I don't want to accuse you of anything, but if I were you, I would observe the amount of air bubbles, especially during cold starts, as closely as possible near the ZK (likely referring to a component or system) in both the inflow and outflow lines.

Most of the time, the simplest explanation for such problems is also the correct one.


PS: I wouldn't necessarily agree with the statement "a few are normal." While it's true that "a few don't cause any problems," I don't see a technical reason for it other than a leak. Therefore, I would like to investigate the cause of your blisters.

Regards,
Guste.