What are the common problems with the Changan 474 engine?
3 Answers
Changan 474 engine common problems are that the engine sensors are prone to failure after prolonged use, which affects the engine's performance. The following is an introduction to engine sensors: Classification: Engine sensors are essential components of modern automobiles. According to their location, they are mainly divided into crankshaft position sensors and camshaft position sensors. Based on the applied technology, they are mainly categorized into electromagnetic induction sensors, Hall effect sensors, and photoelectric effect sensors. Application: With the rapid development of automobiles, car manufacturers worldwide have put significant effort into the functionality and hardware/software of vehicles. Therefore, all high-end cars use more sensors.
As an automotive technician with decades of experience, I've seen many common issues with the Changan 474 engine. The most frequent problem is ignition coil failure, which causes difficulty starting the engine, especially during cold starts—often resulting in failure to ignite or unstable idling. This is typically due to poor wear resistance in the coil design. Oil seal leakage is another prominent issue, particularly after high mileage, leaving noticeable oil seepage traces in the engine bay. If left unaddressed, it can contaminate other components. Excessive engine noise is another annoying problem, creating noticeable vibrations inside the car and affecting driving comfort, usually related to balance shaft or bearing precision. Unstable coolant temperature control is also common, with overheating alarms frequently triggered in summer, requiring regular checks of the radiator and fan. I usually recommend owners inspect the spark plugs every 5,000 km, replace oil seal gaskets periodically, and avoid prolonged high-load driving to prevent these issues and ensure stable vehicle performance.
As a long-term owner of a Changan vehicle, my car is equipped with the 474 engine. After several years of use, some minor issues have indeed emerged. It often stalled during startup, and later the mechanic diagnosed it as an ignition system problem, which was resolved by replacing the coil. Oil seal leaks are quite common; after parking, there are always oil drips under the chassis, which is both distressing and hard to clean. The engine noise has also been getting louder, forcing me to turn up the music volume to drown it out while driving. The cooling system issue is also noteworthy—once, during a traffic jam, the temperature spiked and nearly caused a breakdown, but I managed to pull over in time and add coolant. Although these problems are annoying, I've learned to change the oil regularly and perform engine checks to prevent minor issues from turning into major repairs, saving both money and hassle.
