What Causes Shaking During Car Acceleration?
2 Answers
Shaking during car acceleration could indicate an engine malfunction. Possible causes include: engine operation issues, ignition system failure, or fuel injector problems. Detailed explanations are as follows: 1. During operation, the engine requires optimal working conditions. Insufficient air intake typically causes this issue, where poor fuel-air mixture leads to suboptimal engine performance and consequent shaking. 2. Ignition system failures usually result from incorrect ignition timing or prolonged use of spark plugs. Aged spark plugs develop increased electrode gaps, causing abnormal ignition and acceleration-induced vibrations.
I've been driving for over twenty years, and car acceleration shuddering is all too common. Eighty percent of the time, it's an issue with the ignition system—worn-out spark plugs causing unstable ignition is the most likely culprit, especially if they haven't been replaced after 40,000 kilometers. Once the electrode gap widens, it leads to misfiring. Another possibility is ignition coil leakage, where the RPM struggles to rise during hard acceleration, accompanied by jerking. Clogged fuel injectors due to carbon buildup are also common; when fuel supply is insufficient, stepping on the gas makes the engine gasp. Engine mount deterioration is even more troublesome, with metallic clunking sounds accompanying the vibrations. Once, I encountered an old Audi that shook so badly the steering wheel felt like a massage chair—turned out all four spark plugs were burnt out, and replacing them immediately stabilized it. Don't forget to check the air-fuel ratio sensor; incorrect mixture concentration can also cause shuddering.
