A Honda that rattles where it should sing. Usually a solenoid or an oil pressure problem.
A stuck VTEC solenoid, a dirty screen, low oil, or worn oil pressure delivery.
Check oil level and pressure first. The solenoid screen is a cheap fix caught early.
Reading about sounds only goes so far. The tuner on our home page listens in your browser and tells you what it hears. The app goes further: it names the exact fault, checks it against your vehicle, and tells you how urgent it is.