I bought an 07 S6 that was running rough and had a popping noise in the intake. I scanned it and found intake flap codes. I removed the intake and found:
- Large chunks of flaps blocking the ports
- The intake valves badly carboned.
I bought a new manifold and started cleaning the intake valves but found one of the I take valves not moveing stick shut. To investigate I pulled the valve cover and found the rocker arm off the valve and laying in the bottom of the head. Interestingly enough when I cleaned the that valve the one that was stuck closed was heavy carboned the valve working on that clynder was lightly carboned. I almost thing the previous owner was driving it like that for awhile. The valve does move freely and is sealing. Does anyone have any ideas on why this could have happened? I’m in the process of removing the engine to change the camshaft and rocker. Thanks!
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