Quote:
Originally Posted by Titan_br
No one knows? Omfg. I have no clue what is going on.
Anyone has the service book? What it mentions? or Any Service Instructions from dealer?
Now the 271C is gone and it appers 275F: VARIABLE CAMSHAFT TIMING (VANOS) MAXIMUM LIMIT POSITION, INTAKE BANK 1
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We could speculate for weeks but VANOS issues are very complex, possibly caused by a host of culprits, so they really need someone who knows how it works to troubleshoot in person.
For one reason or another, your DME is not seeing the correct cam location when the VANOS is being told to advance cam timing to maximum. Could be caused by a bad sensor, defective or dirty solenoid (most likely), debris in the VANOS adjuster, failure of the VANOS adjuster to hold oil pressure, or the list goes on.
Since yours seems to have migrated from one intake cam to the other, it would seem that there may be an oil pressure issue like debris or a blockage in the solenoids (especially likely if you've opened the engine up for rod bearings or other service) Could also be a bad solenoid, or just a poor electrical connection. Diagnosing properly requires an experienced head and BMW software like ISTA.
The S65 VANOS adjusters are pretty robust, much more so than in the old days. Rarely are there any issues with the actual adjusters unless they become contaminated and the internal rotors score. I've also seen the main bolt loosen up enough to cause it to slip a little bit and eventually ruin the adjuster AND the cam.