Why does the car jerk when releasing the clutch?
3 Answers
Car jerking when releasing the clutch is caused by a mismatch between the engine speed and the current vehicle speed, meaning there is a speed difference between the engine speed and the clutch disc speed. Reasons for jerking when releasing the clutch: Lifting the throttle too early, i.e., releasing the throttle before pressing the clutch during gear shifting, can cause a jerking sensation. Lifting the throttle too late, i.e., pressing the clutch without timely throttle release during gear shifting, can cause the car to accelerate momentarily during the semi-clutch phase, and a power disconnection after full separation can lead to jerking. Methods to prevent jerking: In most cases, the engine speed is lower than the clutch disc speed. After shifting into a new gear, when lifting the clutch to the semi-engaged position, ensuring the engine speed matches or slightly exceeds the clutch disc speed can effectively prevent jerking. Proper coordination between the throttle and clutch is crucial. The speed of releasing the clutch depends on the gear and speed, and the throttle should be adjusted accordingly. Slowly releasing the clutch while applying a bit of throttle can reduce jerking.
I've been driving manual transmissions for over 20 years, and clutch release shudder is all too common. It mainly happens when you release the clutch too quickly without matching the throttle, causing a mismatch between engine RPM and wheel speed. Hill starts make this even more likely - you need to hold the clutch at the biting point until you feel the car tremble slightly, then gently apply throttle. Older cars have the additional issue of worn clutch discs slipping during engagement, causing that jerky motion. Don't constantly ride the clutch when climbing hills in daily driving - it's particularly damaging. If the shudder happens right after starting, check if your engine mount bushings have deteriorated.
Last time I was at the repair shop chatting with the mechanic, he said this issue is most common with new cars and novice drivers. Depress the clutch decisively but not violently, and release it as gently as peeling silk. If the RPM drops too quickly, give it a bit of throttle—never wait until the car shakes to apply gas. They've repaired many cars where clutch master cylinder leaks caused excessive pedal play, leading to delayed clutch response and jerky movements. If the hydraulic system leaks, the pedal will feel spongy, and that's when you need to replace the seals. Don’t forget to check the clutch fluid level during routine maintenance; if the color turns black, it’s time for a change.
