Why do the injectors on your e220cdi keep popping out?

The injectors on your E220 CDI may keep popping out due to several potential issues, such as worn or damaged injector seats, inadequate clamping force from the retaining bolts, or excessive engine vibration. Additionally, a lack of proper maintenance or the use of incorrect injector seals can contribute to this problem. It's essential to inspect the injector and its mounting area for any signs of wear or damage and ensure that the injectors are properly torqued to manufacturer specifications. If the issue persists, consulting a professional mechanic may be necessary to diagnose and resolve the underlying cause.