What is the reason for the jerking at a constant speed of 1500 RPM in a manual transmission car?
3 Answers
Manual transmission cars experience jerking at a constant speed of 1500 RPM due to gear shifting causing engine issues. Below is a detailed introduction about manual transmission cars: 1. Overview: A manual transmission car refers to a vehicle that uses a manual gear-shifting mechanical transmission (also known as a manual gearbox, MT) to adjust speed. This means the driver must manually shift the gear lever to change the gear engagement position inside the transmission, altering the gear ratio to achieve speed changes. The clutch must be depressed to shift the gear lever. 2. Components: Manual transmission cars switch between different gear sets to achieve gear ratio changes. As a key component in power distribution, the transmission must include two major parts: the power input shaft and output shaft, along with the gears that make up the transmission, forming the most basic components of a manual transmission.
My old manual transmission buddy also loves to jerk at a steady 1500 RPM, really annoying! This issue might lie in the ignition system, such as excessive carbon buildup on the spark plugs or aging coils causing uneven ignition. The engine is particularly sensitive at low RPMs, and any misfire makes it wobble. Loose connections in the high-voltage wires are also a common culprit, causing intermittent current flow, which is most noticeable under steady throttle. Then there are those sensors—if the crankshaft position sensor provides inaccurate data, the ignition timing calculation will be off. I’ve checked the spark plugs before, and replacing them made a big difference. Don’t forget to clean engine components regularly; spark plugs should be inspected every 20,000 to 30,000 kilometers to ensure smooth ignition. If the carbon buildup is too thick, just replace them—it saves a lot of trouble.
Having driven manual transmissions for over 30 years, I can say that stuttering at 1500 RPM is most commonly caused by clutch issues. When the clutch disc wears unevenly or the pressure plate doesn't apply enough force, you'll experience slight power slippage during steady driving, feeling distinct jerking motions. A damaged release bearing that causes unstable clutch operation will worsen the problem. In older vehicles, aging clutch assemblies develop noticeable resistance points under specific RPM loads, leading to stuttering. Frequent half-clutch operation in city traffic accelerates wear. Check the clutch pedal travel - if it's too loose or sticky, it needs adjustment. Regularly changing clutch fluid and inspecting pedal clearance can prevent issues. Smooth driving habits help too; avoid resting your foot on the clutch pedal.
