y20dtl engine tuning
How to find manuals which show how to tune Y20DTL Opel Astra engime, free catalogues or pdfs in english french will be good.

The basic diesel engine troubleshooting information below may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-8.html#post1415281