What Causes Abnormal Noises After Starting the Car?
3 Answers
Due to insufficient lubrication caused by the oil pump not yet circulating oil properly during a cold start, temporary friction noises may occur. Generally, no special treatment is needed; simply allow the car to warm up appropriately during a cold start. Symptoms: When the engine is idling, abnormal noises occur after pressing the clutch pedal, and the noises disappear when the pedal is released. Sometimes, noises may occur both when pressing and releasing the pedal. Diagnosis and Solution: If a "rustling" friction noise is heard from the clutch while the engine is idling, and the noise disappears when the clutch pedal is lifted with the foot, this indicates that the pedal return spring is too weak and requires repair or replacement. If the pedal free play is normal but intermittent impact or friction noises occur when the engine speed or vehicle speed changes, this usually indicates that the clutch sleeve return spring is too weak, broken, or detached.
It's quite common to hear strange noises after starting the car, which may mainly involve several areas. If the belt is loose or worn out, it will make a squeaking sound. I encountered this issue in my car last month—it was fine for short trips, but the noise got worse over time. Another possibility is foreign objects stuck in the fan blades, which may cause a rattling noise and affect cooling. If not addressed promptly, it could lead to engine overheating. A water pump issue can also produce a humming or grinding sound, potentially causing leaks. A leaking exhaust system may produce a hissing or popping noise. It's recommended to carefully listen for the source of the noise after starting the car and then turn off the engine immediately to check. Safety first—don’t delay and visit a repair shop as soon as possible. If you're skilled with DIY repairs, you can first check the belt tension and fan, but don’t push your luck. A professional diagnosis is more reliable—don’t risk major damage for minor issues.
Starting noises usually come from the engine bay and need to be checked step by step. Squeaking sounds are mostly caused by loose or worn drive belts - replacing them will restore quiet operation. Clicking noises may originate from loose exhaust manifolds or damaged engine mounts. Sometimes, a faulty cooling fan motor can produce humming noises leading to overheating. Additionally, wiring friction in the engine compartment can also cause abnormal sounds. First identify the sound source before taking action - open the hood after starting the engine and have someone press the accelerator to pinpoint the exact noise type. Never continue driving for extended periods as minor issues can escalate into major problems with skyrocketing repair costs. Visit a nearby repair shop to use a multimeter for checking potential electrical shorts, and handle the situation calmly. Regular maintenance inspections of these components can prevent such issues.
