Ibiza 1.9TD Problems: Common Issues & Fixes

My father is having problems, and I want to try to help.
So, the engine starts poorly, whether it's cold or hot.
'And it's losing power, and white smoke is coming out from the back.'
Maybe it's the diesel pump? Is there a way to test it?
or what else could it be?
It would be really great if you could help me!

Immediately investigate the cause of white smoke. White smoke indicates the presence of water. Possible causes include issues with the cylinder head gasket or the cylinder head itself. Be sure to check the coolant level and see if it's dropping, and also check for the presence of oil in the coolant.

MKB would be great, but since you're writing 1.9TD, it seems everything is clear... The best thing to do is not drive it anymore, otherwise you risk a complete engine failure.

Please enter 'AAZ+crankshaft screw' into the search function. https://community.dieselschrauber.org/en/viewtopic.php?t=2564&highlight=aaz+kurbelwellenschraube Here's just an example:

By the way: you'll find plenty of information about it by searching on Google - and then the car definitely won't start anymore until that's fixed }.