[Chas_97]

My beloved 2014 Imperial Blue w/Silverstone cut out on the freeway this past February, Drivetrain Malfunction-Go Sacrifice Your Firstborn to the Dealership.
Smoke poured out the exhaust and from under the hood.
Dealership replaced HPFP, one bank of injectors, four spark plugs, catalytic converter and the battery.

3 months later, on the expressway again, same exact thing. Tow truck company customer loyalty rewards starting to accumulate.

Had it towed to the other BMW dealership in Atlanta and they replaced the low pressure sensor/delivery module, all of the injectors and are currently admitting that they are not sure what the problem is.

I'm told it's a fuel pressure problem, but root cause is currently unknown after a week at dealership.

During the two failure instances the smoke suggests the injectors dumping a lot of fuel into the combustion chamber.

SA dismissed my ideas that it could be related to low battery voltage, DME banks, VANOS or valve/camshaft timing/positioning.

Who among this fine forum membership can give meaningful input here?

PS: The SA mentioned that BMW switched from Bosch injectors to Delphi injectors....???? The S63TU engine training manual says these injectors can operate up to 2900PSI.