What should I do if the diesel EFI engine has a high idle speed and cannot refuel?

The throttle valve of EFI engine should be tightly closed and airtight (bypass air idle control type). If the throttle valve is not closed tightly at idle speed, resulting in air leakage, ECU can't control it. As a result, the air intake of the engine is large, the VS signal of the air flow meter is increased, and the ECU increases the fuel injection quantity to increase the speed. However, at this time, the idle contact (IDL) of the throttle position (TPS) is still in the closed state, and the ECU supplies oil according to the idle program according to the IDL signal, so as to reduce the fuel injection amount and speed.