Assalamu Alaikum, readers of The Auto Pulse! Today, we are tackling a very common issue that we are seeing more frequently in modern cars like the MG HS and MG ZS: engine misfires.
The vehicle in our workshop came in with the owner complaining of "rough running" and a jerking sensation while driving. Our initial scan confirmed the issue: the car was logging codes for a Random Cylinder Misfire. This often points to a fuel delivery problem.
Our prime suspects were the Direct Fuel Injectors. We removed them for testing, and the results were surprising. Watch our full diagnosis video below.
1. Physical Inspection & Initial Testing
We removed the four injectors from the engine. Visually, they appeared to be in good condition. The seals were intact, and there was no external damage. However, with modern Direct Injection (GDI) engines, a physical inspection cannot reveal internal clogs.
To find the real problem, we placed them on our specialized Fuel Injector Testing Machine.
2. The Problem Revealed: Spray Pattern Test
The machine allows us to check the fuel spray quality (atomization) and measure the flow rate accurately. As soon as we started the test, the issue became immediately clear.
This "sticking" injector was the cause of the random misfire. The ECU was detecting that cylinder #2 wasn't firing correctly because it wasn't getting enough fuel at the right time.
3. The Solution: Ultrasonic Cleaning
Many mechanics would recommend replacing the injector immediately, which is very expensive for MG vehicles. However, we opted for a service first.
We performed an Ultrasonic Injector Cleaning. This process uses high-frequency sound waves and a special cleaning fluid to break down stubborn carbon deposits inside the injector needle, freeing it up.
4. Final Result: Flow Test
After the cleaning cycle, we ran the test again. The difference was night and day:
- Injector #2 was no longer sticking and delivered a smooth spray.
- Flow Rate: All four injectors delivered an identical quantity of fuel (60 mL).
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