What Causes Continuous Vibration and Abnormal Noise in the Rear of a Honda Accord?
2 Answers
Continuous vibration and abnormal noise in the rear of an Accord can be categorized into the following scenarios: 1. The noise occurs only during idling or low-speed operation. Possible causes include: excessive clearance between the piston and cylinder wall; overly tight piston pin or connecting rod bearing assembly; excessive clearance between the tappet and its guide hole; wear on the camshaft lobe profile; sometimes, a loose starter clutch causing pulley noise (especially noticeable during speed changes). 2. The noise becomes irregular at a certain RPM, with brief sounds occurring during rapid deceleration. Possible causes include: cracked camshaft timing gear or loose fixing nut; broken crankshaft; loose piston pin bushing; excessive camshaft axial clearance or loose bushing. 3. The noise appears during rapid engine acceleration and persists during high-speed operation. Possible causes include: loose connecting rod bearings, melted or mismatched bearing shells causing rotation; loose crankshaft bearings or melted bearing shells; broken piston pin; broken crankshaft.
My 10th-generation Accord had the same issue before, with a constant buzzing sound and vibration coming from the trunk area. After a check-up at the repair shop, it turned out to be a problem with the rear suspension—the shock absorber was leaking oil, causing the damping to fail. The mechanic mentioned that many older Accords experience this issue, as the rubber bushings in the chassis components wear out over time. It could also be due to unsecured items in the trunk—my friend’s car had noise issues because a spare oil bottle was rolling around. Another possibility is a loose exhaust hanger, which creates a very noticeable metal clanking sound. I’d recommend getting it checked by a professional technician as soon as possible. Driving with such an issue can be unsettling, and if it suddenly worsens on the highway, it could be dangerous.
