Maserati 2009 Quattroporte Variator (Cam Phaser) Rattle Fixed

Looped 5 times -

Variator (Phaser) rock and rattle is gone -
I fixed mine by adding a Canton Racing oil accumulator which I energize to pressurize the oil galleries (and phaser) before starting.

You can also use a momentary kill switch on the fuel pump - so you crank and pressurize before starting.

Or you can remove the valve covers and the hydraulic actuators and install an anti-drain-back check valve (the official fix)