What causes intermittent idling vibration in the ATSL?
2 Answers
The reasons for intermittent idling vibration in the ATSL are as follows: Use of improper fuel: Cleaning engine carbon deposits Excessive engine carbon deposits are a significant cause, primarily due to the use of unsuitable fuel. It is advisable to add a certain amount of detergent when refueling and drive at high speeds after cleaning. This helps increase displacement and remove stronger airflow from larger carbon particles. Damaged oxygen sensor: Checking the oxygen sensor As an internal control unit of the car, the oxygen sensor is mainly used to monitor the engine's air-fuel ratio. Once damaged, the engine's air-fuel ratio may become unbalanced, leading to a sudden increase in fuel consumption. After the oxygen sensor is damaged, the exhaust pipe will emit darker-colored exhaust gases when the vehicle is running. Therefore, the oxygen sensor needs to be replaced at this time.
As a seasoned driver with over 20 years of experience, I must say the intermittent shaking at idle in the ATSL is quite common. The most frequent culprit is issues with the ignition system, such as severe carbon buildup on the spark plugs or aging ignition coils, leading to unstable current and uneven cylinder operation. If the fuel injectors are clogged and fuel can't get through, the engine will shake like it's dancing. Dirty throttle bodies are another persistent problem, causing uncontrolled air flow at idle and fluctuating RPMs. Additionally, worn-out engine mount rubbers lose their support, making the car wobble noticeably when idling. I recommend checking the spark plugs and throttle body first—these parts are inexpensive to fix, and timely repairs can even save fuel. If the shaking occurs in bursts and then stops, it might be a faulty mass airflow sensor, which requires professional testing. Safety first—don't take chances with a car like this.
