After quite some time my precious received some well deserved TLC.
The victim of said TLC
Slightly dusty engine bay
Cleaning the throttle bodies and Idle control valve for this S54 today. I had some time and after doing this on the M3 last night I simply had to do it on the Z. The smoothness and overall result was very impressive. I could not, not do it on both cars.
Clearly this S54 was a cleaner example to work on. Before pics
I noticed this airbox runners are black and not cream/yellow like in the M3
I used gratuitous amounts of prepsol to clean the intake manifold and icv. And again the liqui moly throttle body cleaner sources from Moranor Axis on the Forum.
After pics for icv
Itbs being cleaned to a mirror finish
Pic of how I kept them open to do the deep clean
And voila!