Well I've looked/listen to numerous videos and I can't find anything that replicates the noise that my 1999 XK8 is producing.
Video Link
The knock has a consistent wave pattern (comes-and-goes, versus knocking every rotation). Idk if it's correlated, but this knock (and rough idle) came after replacing the MAF.
My troubleshooting process:
Lean codes (P0171 & P0174), but smooth idle and no knock --> Seal all vacuum & exhaust leaks, new MAF, reset ECU --> Drive Cycle --> Rich codes (P0172 & P0175) --> MAF error (P0101), Rich codes (P0172 & P0175), rough idle, engine pattern knock --> reinstall old MAF, reset ECU --> rough idle and knock are still present --> clean and test MAF plug contact points (all good) --> test idle without the MAF plugged in --> same rough idle and knock
The car knows the MAF is being plugged in because it does temporarily correct the idle when I plug it in as the engine is running, but it quickly reverts back to the rough idle and knock shortly after.
Any other ideas?
