Hi! My 91 Honda Accord's engine has been very loud the past few weeks. The faster I go the louder it gets. It's definitely not normal. Could it be the transmission? Any advice? Thanks!The noise is like a loud humming....like it's working harder than normal.It's got about 130,000 miles, is well maintained, and the pitch does not change. Depending ont he speed it will get louder or softer.