What is the problem with car shaking at startup?
2 Answers
Vehicle shaking during startup is caused by irregular wear of the clutch, resulting in wobbling. During the engagement process, the clutch disc cannot smoothly engage but instead engages and disengages intermittently. This causes the engine power to begin transmitting and then suddenly slip, making the vehicle feel like it's hopping. It is recommended to first check the ignition system issues, remove the ignition coil to inspect whether the contacts are rusty, and ensure the screws are tightened. If rust is present, the poor conductivity may lead to frequent ignition failures, requiring the ECU to correct the frequency, which can cause engine shaking. Spark plugs should be replaced on time, with different materials having different mileage intervals.
My car shakes when starting, and I've encountered this situation many times before. At first, I thought it was because I pressed the accelerator too hard, but later I found out it's likely an issue with the ignition system, such as worn-out spark plugs or excessive carbon buildup. Spark plugs that have been used for a long time may fail to ignite, causing insufficient engine power and making the car shake like a tremor during startup. Additionally, if the air-fuel ratio is incorrect, clogged fuel injectors, or a dirty mass airflow sensor can also lead to uneven combustion of the mixture. For manual transmission cars, worn clutches or problematic pressure plates can cause jerky shaking when shifting gears. I recommend checking the spark plugs and ignition coils first; replacing them with new ones often solves the problem. Of course, don't overlook the fuel filter—if it's too dirty, it can block fuel supply. Regular maintenance is crucial; inspect these components every 20,000 kilometers. Ignoring the shaking for too long may lead to engine cylinder scoring or increased fuel consumption, so timely action is necessary for peace of mind.
