1. Battery: A weak or failing battery can cause a fluttering noise when the starter motor tries to engage. This is because the battery is unable to provide enough power to the starter motor, which causes it to vibrate and make a fluttering sound.
2. Alternator: A faulty alternator can also cause a fluttering noise when starting the car. This is because the alternator is responsible for charging the battery, and if it is not working properly, it can put a strain on the battery and cause it to make a fluttering noise.
3. Starter Motor: A worn-out or faulty starter motor can also cause a fluttering noise when starting the car. This is because the starter motor is responsible for engaging the engine, and if it is not working properly, it can make a fluttering sound.
4. Serpentine Belt: A loose or damaged serpentine belt can also cause a fluttering noise when starting the car. This is because the serpentine belt is responsible for driving the alternator and other accessories, and if it is loose or damaged, it can cause a fluttering noise.
To determine the exact cause of the fluttering noise, it is recommended to have the vehicle inspected by a qualified mechanic.
