Toyota overbearing 2700vvt valve ring

The reasons for Toyota's overbearing 2700vvt valve ringing are as follows:

1. The exhaust valve is broken. When the engine is idling, some exhaust gas will enter the engine intake pipe through the exhaust gas recirculation valve.

2. When the engine is idling, the amount of mixed gas is very small, and the exhaust gas entering the intake pipe will dilute the concentration of mixed gas.

3. Abnormal noise will be generated when the engine is idling, which will make the engine idling extremely unstable and even lead to flameout.