What is the issue with Nissan Sylphy's cylinder 4 misfire?
3 Answers
The possible causes of this fault vary depending on the vehicle model. Below are the specific reasons: Automatic transmission models: Automatic transmission models are less likely to experience stalling, whereas manual transmission models may stall frequently due to inexperienced driving. However, it is not impossible for automatic transmission vehicles to stall; the main reason is the use of low-quality fuel, which leads to engine carbon buildup and stalling. Manual transmission models: The primary cause is excessive dust in the air, leading to the accumulation of dirt on the idle air control valve and throttle body during engine operation.
I drove a Nissan Sylphy for over ten years and encountered several instances of misfiring in the fourth cylinder. The car would noticeably shake upon starting, the engine light would come on, and there was a lack of power when driving. Common causes include worn-out spark plugs, excessive carbon buildup not cleaned, or a burnt-out ignition coil. Once, after a long trip, the issue appeared, and it was found that the fourth cylinder's spark plug had reached the end of its lifespan—replacing it fixed the problem. Other possibilities include clogged fuel injectors, faulty sensors, or poor compression due to leaking valves. It's essential to get a comprehensive inspection at a repair shop early on. If you prefer DIY, you can check the spark plug's appearance and whether the ignition coil's wiring is loose. Delaying repairs could lead to more severe engine damage and higher costs.
From a technical perspective, the misfire issue in the fourth cylinder of a car is often caused by ignition system failures. This could be due to severely worn spark plugs from prolonged use, or internal short circuits in the ignition coil preventing proper operation. Clogged fuel injectors or unstable fuel pressure may also be culprits. Mechanical factors such as improperly sealing valves or leaking piston rings reducing compression ratio can contribute as well. A simple diagnostic approach is to first replace the spark plugs; if no improvement is observed, then check the cylinder pressure sensor for abnormalities. Using diagnostic tools to read fault codes is the most efficient way to quickly identify the problem, preventing potential damage to other components that could affect fuel consumption and safety. Regular maintenance and timely replacement of parts are crucial to avoid recurrence.
