What is the reason why the Wuling car cannot accelerate when cold but runs normally when hot?
3 Answers
Difficulty in accelerating when the engine is cold but normal when hot is most likely due to blocked fuel lines, a dirty throttle body, or engine carbon deposits. It is recommended to go to a 4S shop for inspection and cleaning of the throttle body, fuel injectors, etc. A faulty ignition coil may cause jerking when the engine is cold. The reasons for engine jerking are as follows: 1. High engine idle speed. 2. Improper adjustment of the throttle cable or throttle position sensor, leading to excessively high main oil circuit pressure. 3. Delayed upshifting. 4. Cracked or loose vacuum hose of the vacuum-type throttle valve. 5. Malfunction of the main oil circuit pressure regulator, causing excessively high main oil circuit pressure. 6. Stuck damper piston, failing to provide damping. 7. Missing one-way valve steel ball, causing the shift actuator (clutch or brake) to engage too quickly. 8. Slipping shift actuator. 9. Oil pressure solenoid valve not working. 10. Faulty ECU.
I've been repairing cars for almost twenty years, and it's too common to see Wuling vehicles struggling to accelerate when cold but running fine when warm. Most of the time, it's the coolant temperature sensor acting up. During cold starts, the ECU needs accurate temperature data for fuel mixture adjustment. If the sensor is faulty, the ECU thinks the engine is warm and reduces fuel supply, leading to weak acceleration. Carbon buildup in the fuel injectors is another common issue, causing uneven fuel spray and insufficient supply when cold. Worn-out spark plugs or incorrect gaps result in weak ignition and poor performance in cold weather. A dirty throttle body affects air intake—Wuling engines are simple but prone to carbon deposits, so I recommend cleaning them every six months. If left unfixed, fuel consumption will skyrocket, and it might even damage the catalytic converter. It's best to visit a professional workshop to scan for trouble codes with a diagnostic tool and address the issue promptly.
I've been commuting with my Wuling Hongguang for three years. Last winter, it was particularly sluggish when starting cold but ran normally after warming up. The mechanic at the repair shop said the fuel filter was clogged, causing insufficient fuel pressure and poor fuel supply during cold starts. Replacing the filter solved the problem. A dirty mass airflow sensor can also cause the computer to miscalculate the fuel amount, and old spark plugs may result in weak ignition during cold starts, which is common. Wuling vehicles are economical and affordable, but maintenance should not be neglected. The filters tend to get dirty easily, so it's recommended to check them every 20,000 kilometers. Replacing them yourself is simple and cost-effective. Address issues promptly to avoid breakdowns that could affect travel safety.
