What are the reasons for a car not starting and producing abnormal noises?
2 Answers
There are several reasons why a car may not start and produce abnormal noises: 1. If the car has been parked for a long time, the engine oil in the internal oil passages may flow back into the oil pan (some oil passages have pressure-retaining valves). Additionally, as the temperature gradually drops, the low-temperature flow performance of the oil deteriorates. When the engine is cold-started, the oil cannot be delivered to the designated lubrication points in time, requiring a certain amount of time for pumping, which results in a "clicking" abnormal noise. 2. Apart from engine-related factors, a component on the engine can also automatically simulate a "clicking" sound. This component is the carbon canister solenoid valve. Its function is to open when the engine starts (or during rapid acceleration), allowing the gasoline vapor adsorbed in the carbon canister to be drawn into the intake manifold under vacuum and then into the cylinders for combustion. This process aims to reduce gasoline pollution to the environment and also lowers fuel consumption.
I've encountered many car owners facing this issue where the car won't start and makes strange noises, most commonly caused by insufficient battery power. When the battery is old or has been left unused for a long time without charge, the starter motor struggles to turn, producing a harsh clicking or grinding sound, resembling gears spinning freely. Other causes include damage to the starter motor itself, such as worn internal carbon brushes leading to unstable rotation, or burnt relay contacts creating noise when powered. It could also be due to fuel pump or ignition system failures, resulting in startup failure and noise. In such cases, avoid repeatedly attempting to start the car forcefully, as this can worsen the damage. It's advisable to first check the battery's condition and measure if the voltage meets the standard—consider replacing it if it's below 12V. If that doesn't solve the issue, inspect for loose connection wires. Lastly, promptly visit a professional repair shop for a comprehensive diagnosis to avoid increasing repair costs. Safety comes first; ensure the vehicle is reliable before hitting the road.
