Quote:
Originally Posted by MYM05
So far I know there are electrical and mechanical components of Vanos.
Electrical failure --> computer code will flash, SES light
Mechanical failure --> loss of power, bumpy idling / revving.
What is the worst case scenario that can happen when there is faulty Vanos. Will it cause bent engine valve? If so, how?
What is the protocol for BMW US to decide when to replace the Vanos? In Australia here, I was told that they can just recommend to replace the Vanos if it is noisy, because noisy Vanos means that there is no enough oil pressure in the unit.
Thanks
Nelson
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Worst case scenario of failed VANOS is a really big bill to replace it. In and of itself, the VANOS cannot cause engine damage through failure. Related failures, such as a broken timing chain or one that jumps a tooth are clearly a different issue and can cause significant engine damage.
Honestly, having read a fair bit on VANOS and being reasonably familiar with variable valve timing in general, I can't see how the mechanicals of a VANOS could failure. The monitoring components are certainly suspect (CPS) and the solenoid itself can go, but even in these cases, the expensive part of the system (the mechanicals that actually change the timing) are unaffected.
d-