You may have 2 unrelated problems here.
Astra`s need top quality oil and regular oil changes as the tappetts are hydraulic, so the noise you are hearing could be the tappetts sticking. An oil change and an engine flush may help depending on how bad it is.
To get the second problem sorted it may be better to get a garage to plug it in to the diagnosis unit to bring up a fault code, so they then no where the problem lies.
Posted on Sunday 15th of January 2012Don't understand this? Ask a question