How to Adjust the Idle Speed of MG ZS?

[DelRebecca]

First, turn the plug clockwise until it stops, then rotate it counterclockwise for 3 turns. Install the idle speed motor back into the vehicle, fully turn the key to the ON position, and the onboard computer will automatically adjust the idle speed motor. Here are the relevant details about idle speed adjustment: 1. Start the car. If the idle speed is normal, the adjustment is correct. If the idle speed is too high, it indicates excessive air intake, and you need to remove it and turn it counterclockwise one more turn, repeating the above steps. If the car fails to start, it indicates insufficient air intake, and you should turn the plug clockwise one more turn. 2. The basic conditions for adjusting idle speed include: normal engine temperature, proper valve clearance, normal ignition system, good sealing of all pipes, fully open choke valve, tightly closed throttle valve, etc. 3. Excessive idle speed will increase fuel consumption and engine temperature, leading to increased wear. Too low idle speed may cause the engine to stall easily when starting, which is harmful to the engine.

[LeLena]

The idle speed of the MG ZS is automatically managed by the ECU (Electronic Control Unit), so there's absolutely no need for manual adjustment. If you notice the idle speed fluctuating, it's almost certainly due to issues elsewhere. For example, excessive carbon buildup in the throttle body can block air intake, dirty fuel injectors can cause unstable fuel supply, or aging ignition coils can lead to irregular spark plug firing. I once encountered an owner who insisted on adjusting the idle speed, only to find out after disassembly that the air flow meter sensor data was drifting—replacing the sensor stabilized it. So don't tinker blindly; first read the fault codes and check the data stream. If the idle speed is unstable when the engine is cold, you might need to clean the throttle body. If it still shakes when the engine is warm, focus on checking the oxygen sensor or vacuum tube leaks. These tasks require professional equipment, so it's best to drive straight to a 4S shop for handling.

[LaRyan]

Having driven the MG ZS for three to four years, I've also encountered abnormal idling issues. This car doesn't require manual idle adjustment—the ECU handles it automatically. The most likely culprits are the intake and fuel systems. When the throttle body gets as dirty as soot on a pot's bottom, the idle speed becomes erratic; if the fuel filter clogs and restricts fuel supply, the car will struggle noticeably. Last time my car shook violently during cold starts, replacing the spark plugs fixed it immediately. It could also be due to aged engine mount bushings, where vibrations make you mistakenly perceive unstable idling. Routine maintenance like cleaning the throttle body and replacing spark plugs every 20,000 km can largely prevent idling problems. If repairs are needed, spending around 100 yuan for a professional technician to scan fault codes is wiser than buying tools for a few dozen—saving both time and effort.

[DeGrant]

The idle speed of the MG ZS is automatically controlled by the computer, and there's no manual adjustment available. If the engine frequently stalls or shakes at idle, it's most likely due to a dirty throttle body or severe carbon buildup. This is especially common for vehicles driven mostly in urban areas, where sludge tends to accumulate on the back of the intake valves. Additionally, check for any cracks in the vacuum tube, as a leak in that small tube can cause erratic idle speeds. Sensors are also crucial; a faulty crankshaft position sensor can directly cause the computer to miscalculate the engine speed. It's recommended to start by cleaning the throttle body. If that doesn't work, take it to a repair shop to read the fault codes. When refueling, try to choose cleaning-type fuel additives, as they help reduce carbon deposits.