Why does the Roewe 550 have unstable idling and stall?
2 Answers
Unstable idling and stalling may be caused by the battery. If your battery has been used for too long, self-starting batteries generally last for two years, while ordinary ones typically last for three years. If the battery has been used for a long time and the car stalls easily while driving, and the indicator light flashes when starting, it could be a sign of battery failure. You can also measure whether the battery voltage is 12V and whether it reaches around 14V after starting. If the voltage does not meet these standards, it is recommended to replace your battery. Below is relevant information: 1. Battery: A battery, also known as an accumulator, is a type of cell that works by converting chemical energy into electrical energy. 2. Classification: Ordinary batteries, dry-charged batteries, and maintenance-free batteries.
Unstable idle speed and stalling are quite common, especially in older models like the 550. I suspect it could be due to a dirty or stuck idle control valve, or excessive carbon buildup blocking the intake, causing RPM fluctuations. Another possibility is an issue with the ignition system, such as worn-out spark plugs or faulty ignition coils, leading to unstable ignition. The fuel system shouldn't be overlooked either—clogged fuel injectors or insufficient fuel pump pressure can cause the air-fuel mixture to fluctuate between lean and rich. Additionally, sensors like the throttle position sensor may provide inaccurate signals, or vacuum leaks could disrupt pressure balance. When checking it yourself, start by inspecting the air filter—replace it if it's dirty. If there's no improvement, it's best to visit a professional repair shop for a diagnostic scan with an OBD tool. This issue is most frustrating in traffic jams, as sudden stalling can compromise safety. Prolonged neglect may also wear out other components, so it's recommended to clean the throttle body every 15,000 kilometers.
