How to solve the problem of unstable idle speed and frequent stalling of BYD F3?
3 Answers
Unstable idle speed is often caused by excessive carbon deposits in the throttle body or a faulty idle speed control valve. Cleaning the throttle body and replacing the idle speed control valve can help. Electrical circuit failure, such as low-voltage power interruption during driving, can also cause stalling. It is recommended to check the ignition and starter switches, as well as the fuse box. Fuel system issues, including a damaged fuel pump, ruptured fuel line, clogged fuel injector inlet, or an empty fuel tank, can lead to stalling. Restarting the car may temporarily resolve the issue.
I know this issue all too well, my eight-year-old F3 had the same problem recently. After some research, I found there are three key areas to check: The throttle body needs to be removed and cleaned - too much carbon buildup is like a person gasping for air and can cause stalling; Spark plugs must be replaced if worn out, those standard factory ones usually don't last beyond 20,000 km; The most easily overlooked part is the intake manifold gasket - when the rubber deteriorates and leaks, it causes erratic idle speeds. Oh, and add a bottle of fuel system cleaner to your tank and take a highway run - sometimes clogged fuel lines can cause this too. If it still persists, check the front oxygen sensor - when this goes bad, fuel consumption skyrockets and idle becomes unstable.
Veteran drivers suggest focusing on the electrical system. My F3 stalled last year due to a cracked ignition coil leaking electricity, and upon disassembly, the high-voltage wires had turned white. Use a multimeter to measure the resistance of the spark plug wires; if it exceeds 5 kilohms, there's definitely an issue. Spray carburetor cleaner on the idle control valve—if the shaft is stuck, it can cause erratic behavior. Also, a faulty throttle position sensor contact is particularly annoying; use WD40 to clean the contact points. A loose air filter box clip causing an air leak can also lead to stalling—this requires sealing with adhesive. If you're doing it yourself, start with the simplest task like changing the spark plugs, and remember to push the spark plug wires all the way in until you hear a click.
