I may be worrying too much, but last night I noticed an unusual ticking sound coming from the engine.
It's a 1.6 16v ECOtec engine in a MK4 Astra.
It sounds like it was coming from the cam pully. I turned the engine off checked the tension and if the pully belt was frayed anywhere and all was fine.
What it sounds like it like a push rod engine and the tappets needing to be reset. The ticking got quicker the more revs I piled on.
Any ideas what it could be? or am I worrying too much?