What Causes Vehicle Shaking During Idle?
3 Answers
Vehicle shaking during idle can be attributed to the following specific reasons: Dirty Throttle Body: When the car is started, the engine operates at idle speed, requiring continuous airflow through the throttle body into the cylinders for combustion with gasoline. If the throttle valve is excessively dirty, it reduces the intake air volume in the intake pipe. When this air volume fails to meet the normal air-fuel ratio, it results in engine shaking. Excessive Internal Carbon Buildup in the Engine: Prolonged use of the engine can lead to excessive carbon buildup inside, causing engine shaking. The internal working environment of an engine is extremely harsh during operation. Over years of accumulation, carbon deposits continuously surround the intake valve ports. Over time, this can cause the valves to not seal properly, and in severe cases, lead to engine shaking. In such situations, it is necessary to remove the intake manifold and clean the carbon deposits around the valves.
Body shaking during idle parking is something I've seen a lot in my decades of driving. Most of the time, it's due to the aging and loosening of the engine mount rubber, which fails to absorb vibrations, causing the body to wobble. Spark plug carbon buildup or ignition coil leakage are also common culprits, leading to unstable cylinder misfires. Too much carbon clogging the throttle can cause uneven fuel injection and shaking as well. Last time I encountered this, replacing the engine mount rubber did the trick. Regular inspection and maintenance are key—don't let vibrations damage engine bolts. Continuous shaking can lead to major failures, so it's best to drive to a repair shop for handling. Safety first.
The idle speed body shaking makes me nervous, possibly due to unstable engine operation, such as a dirty throttle or clogged fuel filter, causing airflow obstruction and vibration. Dirty fuel injectors leading to uneven fuel spray can also cause shaking. Excessive vibration affects driving, even shaking the seats, and if not repaired promptly, it may lead to loose wiring or even stalling, especially when parked, which is unsafe. I recommend visiting a professional shop as soon as possible for a diagnostic scan to check for sensor faults. Also, ensure the air filter is clean to prevent carbon buildup from worsening the issue.
