Originally Posted by spool twice
That's the sound i'm hearing too
Originally Posted by trickcruiser
What vanos codes are you getting? That will really help pinpoint the issue.
The sounds that you are hearing could be normal for direct injection. My 335i was noisy as hell and it always worried me. My 135i sounds the same as does my friends 335i. All of these cars have had the vanos solenoid's replaced. We were throwing vanos codes after hard pulls.
Im not getting any vanos codes.
Car has 28K miles, and the noise has been present for about 5-8K miles.
with the radio off, its an annoying whiring sound. whiring comes on strong, and then quiets down, comes back strong, quiets down, does this sound quickly and on going.
Im going to remove and clean my intake/exhaust solenoids with wd40 and compressed air, see if the sound goes away.
I have ruled out the DME fan inside the ECU box, and the boost solenoids, since my issue, the sound moves with RPM's in neutral.. So boost solenoids aren't rpm dependent, and these two should be making noise always, not sometimes, and not when warm only.