Focus Throttle Valve Failure Case?
2 Answers
Damage to the throttle position sensor can cause engine shaking and unstable idle. Here are the relevant details: 1. Throttle Valve: Since the throttle position sensor detects the throttle opening signal, the engine control unit adjusts the fuel injection volume and ignition timing based on the throttle opening. If the throttle valve is damaged, the engine control unit cannot correctly receive the throttle opening signal, leading to inaccurate regulation of fuel injection and ignition timing. In severe cases, the engine may fail to start. 2. Fault Symptoms: After starting the car, whether the engine is cold or hot, if the accelerator pedal is quickly pressed and then released, the fault light will illuminate, accompanied by idle shaking and the engine speed being limited to 3000 RPM. At this point, if the car is turned off and restarted, it returns to normal. Upon accessing the engine system, two throttle valve faults are detected.
Last year, I helped several Focus owners with throttle body issues. The most common symptoms were weak acceleration, severe shaking at idle, and occasional sudden stalling. From cases I've seen, models like the 2010 Focus are prone to excessive carbon buildup. When the throttle gets clogged, air can't flow properly, causing engine malfunctions. This is often due to poor maintenance - infrequent air filter changes or contaminated fuel. The solution usually involves disassembly and cleaning, or throttle body replacement in severe cases. Some vehicles even get false error lights from electronic sensors, requiring computer resets. The repair isn't expensive, typically costing a few hundred yuan, but prolonged neglect can damage the engine. Regular maintenance every 10,000 km can prevent this - it's worth checking to avoid roadside breakdowns.
