Hello,
I have a 996tt which is making knocking/rough sounds at idle and while driving. The noise seems to change with the RPM, however, it goes away depending on the engine load.
Here is the information I have gathered so far:
- Durametric shows code P0021 - Porsche fault code 325 - Camshaft position with respect to crankshaft bank 2.
From what I have read it seems like this could be caused by a “spun cam” where the inner sleeve of an intake cam rotates, blocking oil flow used to advance the camshaft. Some details here https://www.joeleggs.com/blog/997-turbo-gt2-camshaft-adjustment-failure-fault-code-p0021
- Camshafts deviation for bank 2 is ~13 degrees, while bank 1 is near 0.
- Occasionally code seen these codes, however, they have not persisted:
P1349 - Camshaft adjustment bank 1 Below limit
P1358 - Camshaft adjustment bank 2 Below limit
- When I activate the variable lifter with the Durmatric the idle becomes rough and there is a clunking sound.
I am preparing to open camshafts in December, but ahead of this, I want to anticipate what I might encounter.
Any thoughts on what could be going on?
Thank you!