What causes the Roewe 350 to stall due to low idle speed during cold starts?
3 Answers
Roewe 350 stalls due to low idle speed during cold starts because of poor ignition performance, excessive carbon buildup in the intake system, or fuel injector failure. Below is a detailed explanation of the causes: Poor ignition performance: Aging ignition coils, aging high-voltage wires of spark plugs, or leakage can reduce ignition energy, leading to unstable idle speed and a tendency to stall. Carbon buildup in the intake system: Excessive carbon deposits on the valves and intake passages can cause low idle speed and stalling after a cold start. Fuel injector failure: When the fuel injector nozzle is clogged with carbon deposits, it results in poor fuel atomization, causing the air-fuel mixture to become too lean and leading to stalling.
Having driven for over a decade, I've found that low idle speed and stalling during cold starts in the Roewe 350 are often caused by carbon buildup in the throttle body. This is especially common in winter when temperatures are low, as the engine requires a richer air-fuel mixture, but carbon deposits obstruct airflow, leading to a lean mixture and stalling. A friend of mine experienced this issue, and it was resolved after a thorough cleaning at the 4S shop. Additionally, carbon buildup in the fuel injectors is another common problem, affecting fuel atomization and making cold starts difficult. Long-term neglect can lead to oil burning or increased fuel consumption. It's recommended to clean the throttle body every 20,000 kilometers and occasionally drive at high speeds to help blow out carbon deposits. Pay attention to the air filter's condition and replace it promptly when dirty, as this is quite effective in preventing carbon buildup. Developing a habit of warming up the engine for a few seconds before a cold start can also reduce the risk of sudden stalling.
As a car enthusiast, I've noticed that the unstable idle and frequent stalling during cold starts of the Roewe 350 are often related to sensor failures, such as aging coolant temperature sensors or oxygen sensors. These faulty sensors provide incorrect readings, causing the electronic control unit to make improper adjustments and resulting in an imbalanced air-fuel mixture during cold starts. Poor spark plug ignition performance is another contributing factor, as misfires can reduce idle stability. Additionally, aging wiring in the engine control module that sends erroneous signals can also have an impact. It's advisable to use a simple diagnostic tool to check for trouble codes like P001 and promptly replace worn components to prevent a surge in fuel consumption and excessive emissions, which is crucial for overall engine health.
