What causes the Nissan Teana to jerk when starting?
2 Answers
Severe engine carbon deposits, ignition system failure, unstable oil pressure. Fault details: The most common cause of car jerking is a dirty throttle body or excessive carbon deposits on the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold-start injectors is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making the engine difficult to start. Common faults: The jerking when starting the Nissan Teana may be caused by a rigid connection between the torque converter and the CVT. Below 20 km/h, the CVT transmits power to the engine through the torque converter (i.e., a soft connection). In this state, pressing the accelerator pedal causes the engine speed to rise significantly, but the power transmitted to the wheels is relatively low, resulting in a perceived lack of power.
My Teana had a jerky start once, and after checking, I found the automatic transmission fluid was too dirty. Degraded fluid can cause rough shifting. Additionally, if the ignition coils are aging or the spark plugs are fouled with carbon deposits, unstable engine ignition can also lead to shaky starts. I recommend starting with simple checks, like inspecting the transmission fluid color—if it's black or has a strange odor, it should be replaced. Spark plugs should be changed every 30,000 kilometers to prevent issues. Don’t overlook the air filter; a dirty one affects air intake. It’s safer and more cost-effective to diagnose problems early at a professional shop. Delaying repairs can lead to more expensive and troublesome part replacements later. Safety and saving money are key.
