Emgrand EC718 automatic transmission jerks during start-up?
2 Answers
Emgrand EC718 automatic transmission jerks during start-up due to lean air-fuel mixture, delayed ignition, weak spark, or transmission malfunction. Symptoms of engine acceleration weakness: When the engine is running, pressing the accelerator pedal doesn't immediately increase RPM, showing sluggish response. During acceleration, engine vibration and RPM fluctuation may occur, sometimes accompanied by backfire or popping sounds. Specific causes of engine acceleration weakness: Intake manifold leaks causing lean air-fuel mixture; low fuel pressure; clogged fuel injectors or fuel filters reducing fuel delivery; malfunctioning sensors (air flow meter, intake manifold absolute pressure sensor, throttle position sensor) failing to increase fuel supply properly; incorrect ignition timing due to faulty sensor signals; weak spark from faulty spark plugs, ignition coils or high-tension wires; dirty throttle body; malfunctioning EGR system; clogged exhaust pipe; low cylinder compression; turbocharger system failure.
I've driven the Emgrand EC718 automatic transmission for several years, and jerky starts are quite common. It feels like the car is lurching, as if the power can't keep up. This could be due to aged or insufficient transmission fluid, or dirty fluid hindering smooth gear shifts. Another possibility is issues with the engine ignition system, such as dirty spark plugs or failing ignition coils causing uneven combustion. Additionally, carbon buildup in the throttle body can block air intake and affect acceleration response. When starting, avoid stomping on the accelerator; instead, apply throttle gently to let the transmission adapt. Regular maintenance, including fluid changes and throttle body cleaning, can prevent these issues. The Emgrand is generally sturdy, but don't neglect maintenance, especially for critical components like the transmission system. It's advisable to have a professional diagnose it to prevent minor issues from becoming major problems.
