What Causes Shaking During Rapid Acceleration?

[DeAlivia]

Vehicle acceleration shaking can be attributed to the following reasons: 1. The most common cause of car shaking is a dirty throttle body or excessive carbon buildup in the fuel injectors. When there is too much carbon deposit inside the engine, the gasoline sprayed by the cold-start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. In this situation, the car will only start easily once the carbon deposits have absorbed enough gasoline to reach saturation. 2. After starting, the gasoline adsorbed on the carbon deposits will be sucked into the combustion chamber by the engine's vacuum, enriching the air-fuel mixture. This leads to fluctuations between lean and rich air-fuel mixtures, causing idle shaking after a cold start. 3. The lower the temperature, the more fuel is required for a cold start, and the presence of carbon deposits will significantly affect the success of the cold start. Cleaning the fuel system can help resolve this issue.

[OTravis]

The car shaking during sudden acceleration is really nerve-wracking. Last week when I took my old buddy on the highway, I encountered this problem - the whole steering wheel vibrated as soon as I stepped on the gas. First, I checked the spark plugs, and sure enough, two electrodes were severely eroded. Replacing them improved the situation significantly. If the ignition coils are aging or there's high-voltage wire leakage, misfires and shaking are likely during sudden acceleration. Don't overlook the fuel system either - clogged fuel injectors due to carbon buildup or insufficient fuel supply from the pump can cause incorrect air-fuel mixture ratios leading to this issue. Additionally, when the transmission torque converter slips, the shaking can be severe, feeling like sudden power loss. The worst case is aging engine mounts - my neighbor's car shook so badly that drinks in the cup holder were dancing, as cracked rubber components completely lost their vibration absorption capability.

[Jan]

Sudden acceleration shaking needs to be analyzed by parts. If the engine shakes, prioritize checking the ignition system, such as excessive spark plug gap or ignition coil leakage, where ignition energy can't keep up during sudden acceleration. Vibration from the transmission should raise alerts for torque converter or clutch slippage, especially in older vehicles with over 100,000 kilometers. Steering wheel shaking is mostly due to worn inner CV joints, especially if accompanied by clicking sounds during turning acceleration. Additionally, if the four tires have significant dynamic imbalance, the entire vehicle wobbles during high-speed acceleration. Last time my car shook, it was because the rear engine mount rubber had completely broken, causing metal-to-metal contact – the vibration was like a tractor.

[NathanMarie]

Sudden acceleration shakiness often reveals hidden faults. Worn-out spark plugs are the most common cause - when the electrode gap is wide enough to fit a coin, shaking is inevitable. A clogged air filter causing insufficient air intake can also make the engine sputter, which can be fixed by simply replacing the filter. If the outer CV joint is worn, the steering wheel will vibrate like a phone in vibration mode with slight throttle input. A clogged fuel filter is more troublesome, causing insufficient fuel pressure during sudden acceleration. The most concealed issue I've encountered was a faulty crankshaft position sensor - inaccurate signals during sudden acceleration led to ignition disorder, without triggering the dashboard warning light.