S55 is an inline-6, high-rev, turbocharged petrol engine. Mainly, It was designed for performance cars. It is equipped with the new BMW’s M TwinPower Technology: two mono-scroll turbochargers that can develop up to 7500RPM, high precision direct-injection, and Valvetronic VVT, and double VANOS variable camshaft timing that provides complete
Vanos (or variable Nockenwellensteuerung) is BMW’s take on VVT and was first introduced on the M50 engine within the 5-series of the 90s. It also uses cam phasing but with a helical gear within
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The BMW Service Tech had seen firing and VANOS errors and was just hoping that if he changed enough items it would fix the problem. It didn't. When I got back and diagnosed it as a torn o/s membrane requiring a new valve cover (integrated o/s) and valvetronic sensor (PM item when cover is removed/replaced on N52) her bill for this needless work
FU5S. 429 675 145 296 149 770 811 886