What Causes Engine Vibration After Hitting the Chassis?
2 Answers
Reasons for engine vibration after hitting the chassis are as follows: 1. Check the engine mounts: It could be due to hardened or cracked mount bushings, leading to engine vibration. 2. Inspect the mounting bolts: Loose engine mounting bolts can also cause vibration. 3. Examine the transmission: If the engine is fine, check the transmission. High mileage transmissions may have worn components with increased clearances, resulting in vibration. 4. Inspect the underbody shield: The noise might come from contact between the shield and engine. In this case, contact a 4S shop directly for inspection and repair.
I've encountered this situation many times. When the engine starts shaking after the chassis is hit, it's mostly due to issues with the exhaust system or mounting brackets. If the chassis guard plate is dented, it can easily damage the exhaust manifold or catalytic converter. Restricted exhaust flow forces the engine to work harder, causing unstable RPMs and severe shaking. If you hear metal scraping sounds from the chassis and suddenly feel the steering wheel vibrating, immediately stop and check if the engine mounts are loose. Even a one-millimeter misalignment in the rubber mounting pads can cause resonance. Another possibility is accidental damage to the oil pan causing rapid oil leakage. Insufficient lubrication increases internal engine part friction, leading to violent shaking - this requires immediate towing.
