What Causes Engine Speed Mismatch?

[VonIvan]

Possible causes include abnormal transmission fluid level or use of unqualified fluid, abnormal transmission oil pressure, transmission oil pump failure, friction plate wear leading to slippage, or oil leakage in the oil circuit. For manual transmission vehicles, the clutch will gradually wear with use. However, discussing clutch wear alone is too general, as the automotive clutch consists of many components. Different components exhibit different symptoms when worn to a certain extent. The most prone to wear are the clutch disc, pressure plate, and release bearing. Consequences of low gear with high RPM: As long as this condition is not sustained for a prolonged period, it will not cause harm to the engine. Consequences of high gear with low RPM: This condition is commonly referred to as "lugging the engine." The specific symptoms include weak vehicle acceleration and a tendency to stall. Prolonged operation under these conditions can lead to engine carbon buildup.