Transmission Related:
* Low Transmission Fluid: Low fluid leads to insufficient lubrication and can cause jerking, especially during shifts.
* Dirty or Worn Transmission Fluid: Old, contaminated fluid doesn't lubricate properly and can cause harsh shifts and jerking.
* Slipping Transmission: This is a serious problem where the transmission isn't engaging properly, resulting in loss of power and jerking. This often requires a transmission rebuild or replacement.
* Worn Clutch (Manual Transmission): A worn clutch will slip, leading to jerking and difficulty engaging gears.
* Solenoid Problems (Automatic Transmission): These control fluid flow within the transmission. A faulty solenoid can cause erratic shifting and jerking.
* Torque Converter Issues (Automatic Transmission): Problems with the torque converter (which connects the engine to the transmission) can cause jerking, especially during acceleration.
Engine Related:
* Spark Plugs or Ignition Wires: Faulty spark plugs or wires can cause misfires, leading to jerking and loss of power.
* Fuel Injectors: Clogged or malfunctioning fuel injectors can cause inconsistent fuel delivery, resulting in jerking.
* Mass Airflow Sensor (MAF) Sensor: This sensor measures the amount of air entering the engine. A faulty MAF sensor can cause a lean or rich fuel mixture, leading to jerking.
* Throttle Position Sensor (TPS): This sensor tells the engine how much throttle is applied. A faulty TPS can cause erratic engine response and jerking.
* Vacuum Leaks: Leaks in the vacuum system can disrupt the engine's operation and cause jerking.
Other Potential Causes:
* Wheel Bearings: Worn wheel bearings can cause jerking, especially at higher speeds or when turning.
* Driveshaft Problems: Issues with the driveshaft can transmit vibrations and cause jerking.
* CV Joints: Worn CV joints (in front-wheel-drive vehicles) can cause clicking and jerking, particularly when turning.
* Brakes: While less common, issues with the brakes, such as sticking calipers, can contribute to jerking.
What to do:
It's crucial to get your car checked by a mechanic as soon as possible. Describing the jerking (when it happens – acceleration, deceleration, turning, specific gears, etc.) will help the mechanic diagnose the problem. Ignoring the problem could lead to more serious and costly repairs down the line. Don't attempt to diagnose or fix this yourself unless you have significant mechanical experience.
