What Are the Causes of Abnormal Noise in the Engine Transmission?

[GrahamLynn]

Engine transmission abnormal noise is caused by: 1. Wear and damage of bearings; 2. Abnormal gear meshing clearance; 3. Gear tooth surface metal peeling, tooth breakage, or misalignment during assembly; 4. Insufficient lubrication due to lack of lubricating oil; 5. Water ingress into the transmission; 6. Loose bolts on the transmission housing; 7. Loose fit between the gearshift lever and the shift fork groove in manual transmissions; 8. Long-term lack of automatic transmission fluid replacement; 9. Use of inferior automatic transmission fluid. Transmissions are divided into manual transmissions and automatic transmissions. Manual transmissions mainly consist of gears and shafts, while automatic transmissions are composed of a torque converter, planetary gears, a hydraulic torque variation system, and a hydraulic control system.

[RoseLynn]

I'm a veteran driver with decades of experience, and I've encountered quite a few cases of abnormal engine and transmission noises. The most common issue is gear wear or damage inside the transmission, especially in older cars. If you experience rough shifting and hear grinding noises while driving, there's an 80% chance it's the gears. Another possibility is insufficient or dirty transmission fluid - lack of lubrication causes dry friction between components, amplifying the noise. Don't underestimate this; delaying repairs could lead to complete transmission failure, with repair costs running into thousands. I recommend regular fluid checks and changing the oil every two years. Oh, and it might also be engine-related components like loose belts or chains that cause the transmission to rattle too. Bottom line - never ignore unusual sounds, get your car to a professional shop immediately for diagnosis. Safety first.

[ElianaAnn]

I just bought a used car not long ago, and I was terrified when I heard a clicking noise while accelerating. After searching online, I found out that abnormal sounds from the engine or transmission could stem from various issues, such as clutch slippage or flywheel damage, which are especially common in automatic transmission cars. There's also the possibility of a faulty transmission sensor—if its signals are inaccurate, it can report errors randomly. Worried about expensive repairs, I asked a friend who suggested first going to a 4S dealership for a computer diagnosis, as modern cars have complex electronic systems that can pinpoint the exact cause. Cost-wise, minor adjustments might run a few hundred yuan, but if it requires major internal repairs, it could be a significant expense. If the noise occurs frequently while driving, it's best to avoid long trips to prevent the situation from worsening.

[VanFaith]

There are many reasons for transmission noise, such as poor gear meshing, oil pressure issues, or input shaft bearing wear. Gear abnormalities are usually caused by long-term driving wear, producing a sound like metal grinding. Insufficient oil pressure leads to poor lubrication, resulting in a buzzing noise. When the bearing is damaged, there's abnormal noise upon pressing the accelerator. Additionally, incorrect installation can also cause this problem, especially if not properly assembled during repairs. For preliminary checks, listen to the source of the noise—see if it occurs only at specific speeds—and check the transmission fluid level and color; replace it if dirty. For more complex issues, it's best to consult a technician for testing with a multimeter.

[MacAlivia]

On my way to work, the car suddenly made a squeaking noise. I thought it was a minor issue, but later realized it was a sign of abnormal noise from the engine transmission. Possible causes include gear wear, dirty transmission oil, or loose mounting components. Gear damage is usually noticeable when shifting gears, and dirty oil can make operation less smooth. Don’t ignore this small noise—it might indicate a bigger problem. I learned a little trick: after parking, listen for sounds under the car. If the abnormal noise persists, it’s time to address it promptly. Safety-wise, sudden abnormal noise at high speeds can be quite dangerous and may lead to loss of control. Now when I drive, I maintain a steady pace and avoid sudden acceleration to reduce wear. As for repairs, find a reliable repair shop—don’t just go for the cheapest option.

[LeArya]

My husband often repairs our family car. He says that transmission noise is most likely due to gear wear or deteriorated fluid. Worn gears don't mesh tightly, causing a clicking sound; insufficient or oxidized fluid makes the noise dull. Clutch plate issues could also be the culprit, especially in manual transmission cars during gear shifts. A reminder to everyone: don't wait until the noise becomes loud to get it checked. Regular maintenance can extend its lifespan. For example, inspect the fluid every 10,000 kilometers to prevent wear. Ignoring these noises may lead to major component failures, doubling repair costs and straining our family budget.