There is a scream when stepping on the gas pedal. I wonder if there are any friends with the same problem?

The whistle of the fuel filler door may come from the pipe connecting the air intake grille to the air cleaner, which is the thickest plastic pipe in the engine compartment. When the hood is open, it can be cleaned. There are ripples in the middle of the pipe. If you press the corrugated part by hand, will it weaken or disappear? If there is, try to fix it with tape, and tie it tightly to solve the problem.

There is a whistle at the engine oil filler door, which is divided into the internal mechanical part of the engine and the external belt whistle. If it is suspected that the engine is outside, you can water the belt when you stop and hang the P-block fuel filler door.

If the howling disappears, it is because the belt is loose or the quality of the belt itself. If there is still howling after watering, it is an internal problem. There are generally two situations in the machine: howling, howling caused by poor machining accuracy of timing chain in timing system, and large matching tolerance between valve rocker arm and hydraulic jacking cylinder in valve train. It is recommended to go to 4S for repair, repair during the warranty period, and disassemble the machine for inspection.

Brief introduction of throttle valve:

Throttle, also known as "throttle" and "throttle". Refers to the control device that controls the engine power (thrust). On the piston aero-engine, the throttle valve controls the opening of the carburetor to control the filling amount of the cylinder, thus determining the output power of the engine. On the gas turbine engine, the throttle valve controls the metered fuel flow of the fuel regulator, thus determining the thrust generated by the engine.

The position of the throttle is controlled by the driver operating the throttle lever in the cockpit, and it is transmitted to the carburetor or fuel regulator on the engine through control system components such as pull rod, rocker arm, torsion tube, steel cable, pulley and sector wheel. On an airplane, the throttle lever is always pushed forward to increase power (thrust) and pulled back to decrease power (thrust).