I have a 2006 Honda Accord Ex 2.4 (4 cyl), which I've maintained pretty well at 150,000 miles. I have no issues with it. The only thing that gets me rattled is a constant whine that's dependent on RPM after 40 mph speed it begins. Only when I press the gas. As soon as I release the gas pedal it's gone.
What I know for sure:
- in neutral, if I rev up to higher RPMS, no noise
- noise appears to be coming from the center part of the engine
- it is not electronic interference humm
I'm starting to think it's the transmission, but I have no issues from it.