18 Chevrolet Explorer heater is turned on at low gear, and the speed of the heater fluctuates?

What you ask is: "Why does the speed of 18 Chevrolet Explorer heater go up and down?" Generally speaking, the problem of unstable engine speed may be caused by excessive carbon deposition in throttle, idle motor, air intake, intake valve, combustion chamber and fuel nozzle.

The treatment method should not only clean the fuel injector and intake manifold, but also check and clean the carbon deposit inside the throttle and combustion chamber. Because during the cold start, the carbon deposit will absorb a certain amount of mixed gas, which will lead to the mixture being too thin, and the mixture will be poorly atomized during the start, resulting in the unbalanced combustion state of the engine. Or because there is a problem with the carbon canister or the solenoid valve of the carbon canister, the mixed gas is too thick when starting, which will also lead to difficulties in starting. Also pay attention to check the working condition of the spark plug. It may be caused by the failure of the clutch switch or other sensors. Because the engine is controlled by ECU, when shifting gears, refueling and receiving oil, the computer will continuously collect signals from various sensors to control the fuel injection quantity of the engine. Once there is a problem, the computer program will be disordered, resulting in unstable speed.