What Causes High RPM and Delayed Gear Shifting in Transmission?
2 Answers
Automatic transmission vehicles rely on hydraulic systems to determine gear shifts based on throttle input, requiring some time for oil pressure response. Additionally, contaminants inside the transmission, high internal temperatures causing transmission fluid degradation, and subsequent lubrication/temperature control issues can all lead to delayed shifting in 4AT transmissions. Supplementary information: 1. Automatic shifting: Requires sensors to monitor engine RPM and vehicle speed. After analysis by the shift system, it controls mechanical components to upshift or downshift, ensuring appropriate gear selection. 2. AT transmission control program: Features a core self-learning function that automatically adjusts shift timing according to driving habits to optimize shift duration. Prolonged low-speed urban driving will progressively delay AT transmission upshifts.
I previously encountered gear shift delays with high RPMs while driving an automatic transmission car. It felt like the gear shifts were slightly delayed during acceleration, with the tachometer staying high and fuel consumption rising sharply. After consulting several mechanics, they suggested it might be due to insufficient or degraded transmission fluid, leading to low oil pressure and sluggish gear shifts. Another possibility was sensor issues, such as a faulty speed sensor, causing the computer to misinterpret and compensate by increasing RPMs. Ignoring these issues not only wastes fuel but also accelerates internal transmission wear, like burning out clutch plates, leading to costly repairs. I recommend a quick self-check first: after parking for half an hour, check the dipstick—the fluid level should be between the marks, and the fluid shouldn’t be black or have a burnt smell. If unsure, visit a dealership immediately; their diagnostic tools can quickly pinpoint the issue. Remember, avoid high-speed driving with high RPMs to prevent engine damage.
