Diagnosing the RATTLE and STALLING - N42/N46 VALVETRONIC Retainer Spring Replacement [PART #1]

In this video series I diagnose and replace a broken retainer torsion spring that holds the intermediate lever pressed against the VALVETRONIC eccentric shaft on a N42 engine.
PART #1:
2:52 Starting the engine and observing rattling during warmup
3:40 Scanning and diagnosing with INPA
7:32 Switching VANOS solenoids
9:51 Removing valve cover and checking the timing
13:00 Checking if VANOS units are locked
19:43 "Here's your problem" - Broken Valvetronic spring
21:43 Intake VANOS unit won't lock
After chain replacement ( • N42/N46 Chain Replacem... ) I noticed that there are some ticking noises during throttle body to VALVETRONIC operation transition. During this transition the engine stalls but then recovers to "normal" idle RPM.
This car is 2001 E46 316ti Compact BMW with 200.000km on the odometer.
PARTS:
VANOS bolts: 11367500574
Valvetronic Retainer Springs: 11377513873
Spark Plug Cylinder O-rings: 11377514007, 11377514008
Valvetronic Servo Motor Gasket: 11377501015
TOOLS:
N42/N46 Timing tool kit: cutt.ly/yhVmCJF
DISCLAIMER:
BimmerZen assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. BimmerZen recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of BimmerZen , no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not BimmerZen.