Yet another N62 engine knocks like a diesel - E53 X5 4.8is

[danny_acs]

So this has now been fixed, and I'm reporting for the benefit of everyone else that might have this issue in the future.

CPC Performance Engineering in Amersham near London took the car and inspected it. It turned out that the eccentric valve shaft had a lot of wear. They adjusted the motor on the left bank, so the knocking is gone for now. They advised that if comes back, the shaft will need to be replaced, which is an expensive job... Many thanks to them, professional job!

[aureliusmax]

Originally Posted by danny_acs

So this has now been fixed, and I'm reporting for the benefit of everyone else that might have this issue in the future.

CPC Performance Engineering in Amersham near London took the car and inspected it. It turned out that the eccentric valve shaft had a lot of wear. They adjusted the motor on the left bank, so the knocking is gone for now. They advised that if comes back, the shaft will need to be replaced, which is an expensive job... Many thanks to them, professional job!

I'm sorry but there is no such thing as 'adjusting' the eccentric valve servo motor. they must have done something else like reset adaptation/relearn.
When your eccentric valve shaft is worn, you can perform ISTA/D eccentric intermediate lever wear test to determine. the solution is your replace all parts.

BTW @OP , your original video has been nuked. You can also subscribe to thread notifications which email you if new posts.

[PropellerHead]

Originally Posted by aureliusmax

I'm sorry but there is no such thing as 'adjusting' the eccentric valve servo motor. they must have done something else like reset adaptation/relearn.

They're probably talking about adjusting the valve lift. I did this within a year of getting my N62.

[aureliusmax]

Originally Posted by PropellerHead

They're probably talking about adjusting the valve lift. I did this within a year of getting my N62.

Ah, I remember that function. One can adjust the minimum position of the eccentric cam - to make the idle sound a little more aggressive, but there's no actual performance benefit. I believe that only comes into place once the engine oil is warmed up ?