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Solution for me
Grande OSO was exactly right.
I had that exact same noise, been doing research on it, reading threads, etc.
I found this:
The bleeding procedure-
Lifter bleed procedure:
BMW SIB 11.09.07
Metallic Ticking noise coming from engine? – BMW 3-Series (E90 E92) Forum – E90Post.com
SI B 11 09 07 Engine
January 2009
This Service Information bulletin supersedes SI 11 09 07 dated April 2008.
SUBJECT
Intermittent Hydraulic Valve Adjuster (HVA): “Ticking” or “Rattling” Noises
MODEL
All E82, E83, E85, E86, E88, E60, E61, E70, E90, E91, E92, and E93 with the N51, N52 or N52K engines
SITUATION
An occasional ticking or rattling noise from the HVA elements may occur during cold engine starts or frequent short-distance driving.
CAUSE
In these situations, the HVA elements may not yet have been supplied with sufficient amounts of air-free oil. This condition will not cause any damage to the engine, and usually remedies itself with a longer driving distance or operating times at full operating temperature.
CORRECTION
In the event of a customer complaint, please perform the following the HVA bleeding procedure.
PROCEDURE
Important notes:
The bleed time may take anywhere from between two minutes and (in rare cases) to a maximum of 30 minutes. This procedure is to be performed on a level surface with the vehicle stationary, and in a properly ventilated area.
Procedure preconditions:
Engine oil level correct – neither underfilled nor overfilled
Engine running at operating temperature
1.) Bring the engine up to an operating speed (no load) of 2000-3000 rpm and maintain this condition for three minutes (bleeding procedure).
Let the engine idle for 15-30 seconds and reevaluate whether the noise is still present or not.
2.) Engine quiet – procedure is finished.
3.) Engine noise is still present – repeat the procedure; perform steps #1 and #2 up to a maximum of 5 times.
4.) Only if the noise remains after performing the bleeding procedure 5 times: proceed by performing the procedure for a final time, also at an engine operating speed of 2000-3000 rpm, but for a total time duration of 15 minutes.
Wow it was so simple to fix, ticking noise gone after 2x
Good Luck
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