Automatic upshifting requires 3000 rpm to upshift.

What you want to ask is the reason why the automatic upshift is 3000 rpm slower? The throttle valve is too dirty, the engine running resistance is too large, and the transmission oil ATF is too dirty.

1, dirty throttle will lead to smaller throttle opening and insufficient air intake, which will affect the torque output of the engine and lead to shift lag.

2, the engine running resistance is too large, such as high oil viscosity, engine internal wear and other reasons, will also lead to shift lag.

3. Dirty ATF of transmission oil will lead to problems such as wear and seizure of friction plates inside the transmission, which will affect the transmission efficiency of the transmission and lead to shift lag.