What Causes Abnormal Noise When Shifting Gears to Start a Car?

[VonElla]

Possible causes of abnormal noise when shifting gears include: incomplete clutch disengagement (clutch pedal not fully depressed), loose transmission linkage, severely worn clutch disc, damaged pressure plate, gear collision during shifting, fractured gear teeth causing meshing impact, or improper gear engagement. Solutions for abnormal gear shifting noise: Fully depress the clutch pedal; inspect and tighten the linkage mechanism; replace damaged clutch components; check clutch for incomplete disengagement; secure any loose shift lever (including rubber bushings). Maintenance recommendations: Regular inspections: Periodically examine, clean, lubricate, adjust or replace relevant automotive components to maintain vehicle cleanliness, ensure proper technical conditions, eliminate potential hazards, prevent malfunctions, slow deterioration, and extend service life. Lubricant application: Use appropriate automotive/mechanical lubricants (liquid or semi-solid) to reduce friction, protect components, and provide lubrication, cooling, rust prevention, cleaning, sealing, and cushioning effects for vehicle parts.

[DaisyFitz]

My old classic car used to make annoying creaking noises when starting off. Gear shifting noises are mostly due to severely worn clutch plates - slipping after engaging gear causes a whining sound. It could also be gaps between transmission gears that create clunking noises when loose. Alternatively, the aging and slackened belt near the engine might produce high-pitched squealing under heavy initial tension. For diagnosis, I've tried depressing the clutch to listen for sound changes - if the noise varies with speed, it's likely drivetrain issues. Timely repair is crucial since neglect accelerates overall system wear, making part replacements costlier. Regular maintenance like transmission fluid changes can prevent these - I get it checked every 20,000 km.

[GeorgeLee]

I've experienced abnormal noises when shifting gears to start, which sound like friction or impact noises. Common causes include the clutch not being adjusted correctly, leading to slippage and noise; if the synchronizer gears in the transmission are worn, they may clash and make a clicking sound when shifting; and if the engine belt is cracked or loose, it can produce a squeaky sound. For a simple self-check: after starting the engine, shift into neutral and press the clutch, listening to see if the noise disappears. If the sound persists, it might involve a loose differential or driveshaft. Maintenance advice: check the fluid level every 5,000 kilometers—don't skimp on maintenance to avoid bigger problems. Promptly visit a professional repair shop to save both worry and money.

[Rochelle]

There are many reasons for abnormal noises when shifting gears to start. Clutch wear is the main cause, slipping can cause a buzzing sound; transmission gear defects, especially when the synchronizer is broken, can produce a clicking noise; also, improper engine belt tension or looseness can lead to screeching. Checking the clutch fluid level and changing the transmission oil can help alleviate the issue. Ignoring the problem may lead to major malfunctions, so it's important to diagnose the source of the sound before driving.