Audi 3.0 TDI ASB springt sehr schlecht an, keine Ideen mehr! | Posts 16+

Would it be, perhaps, sensible to start troubleshooting all over again from the very beginning?

What would be your approach?

I can then conduct the tests accordingly and post the results here.

Thank you very much!!

Unfortunately, the problem still persists.

I would really like to search for it and, if necessary, create a troubleshooting plan for the Common Rail system.

Has anyone else got any ideas about how I could track down the error? The sudden drop in rail pressure when the engine fails to start, and the fact that the engine and rail pressure are normal *after* the engine has finally started, are very clear facts that could be used to narrow down the cause of the problem...


I would be very grateful for your participation!

Thank you in advance!

I would like to start by checking the remaining amount, to see if there are any outliers, and to ensure that the maximum allowable amount is not exceeded.

And since "new" injectors can also cause damage, it is also helpful to use an endoscope to check the combustion chamber and see if the injectors are wet, which can then cause dripping and a loss of pressure.

However, one cannot achieve much with home remedies.

You need to start the investigation from scratch again, and not exclude any potential source of error.

Hi,
I haven't seen enough data for that, just text.

Herbert wrote:

First, I would start on the approach side so that the high-pressure pump doesn't also run dry. Is the fuel tank vent clear? Are the filters and lines in the tank clean? Is the diesel filter unobstructed? Do the pre-feed pump and fuel pump supply enough fuel and enough pre-pressure (measured)? It has been properly drained (relevant to initial filling)? In addition, a test setup with a fuel metering valve and a fuel pressure control valve is required. After that, a recording of Rail Druck and speed would be interesting, starting from ignition one up to and including the test drive.

Without car scans and records, it seems we're stuck in a dead end.
hg
Herbert