Tapping sound from engine!

[mcbutler]

This is a common problem and in most cases it represents car not being used frequently or not being driven hard enough.
The valves will re-adjust via a purging process.
- Start the car and let it warm up (most important)
- Gradually rev engine in neutral to 2500 - 3000 rpm for 30 sec.
- Listen to see if tick is still happening as it may take up to 5 purges till valves adjust
As I do not use my Z4 that often, it will take a 2 to 3 purge process to quiet it down.
Should this not work, then the problem may require greater mechanical attention.

Redline till you Flatline

Thanks for that Rick, I have recently had the car mapped and the noise appears to have gone!
If it returns I will follow your advice, you are right it does not get a lot of use, just 2 miles to the gym and two miles home most days.