So the knock never came back from my engine, but the whine I've been trying to diagnose I've pretty much pinned on the HECU (by typing in the part number to google - I had no idea what that contraption was and guessed it was an alternator but was wrong).
Again, you hear it during acceleration and at idle (only after driving). It's a whine that gets higher pitched and louder the more you press the gas.
I've seen it called the HECU, the Hydraulic Unit Assembly, etc but there is not very much info on it online. I can tell it's a factory part as it is from HMC (Hyundai Motor Corporation) and is a Manco part. Part no. is 58900-26350.
What could be causing a whine from a part like this?
Again, you hear it during acceleration and at idle (only after driving). It's a whine that gets higher pitched and louder the more you press the gas.
I've seen it called the HECU, the Hydraulic Unit Assembly, etc but there is not very much info on it online. I can tell it's a factory part as it is from HMC (Hyundai Motor Corporation) and is a Manco part. Part no. is 58900-26350.
What could be causing a whine from a part like this?