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P0304 P0xxx · 动力总成（P） 高严重度
Cylinder 4 Misfire Detected
Cylinder 4 misfire. Swap-test ignition and fuel components first; compression last. This is the most reliable way to avoid replacing good parts.
严重程度说明： 高——立即停车诊断，继续行驶有扩大损坏的风险
你会注意到的故障现象
- Rough idle
- Shaking under acceleration
- Flashing MIL
- Poor fuel economy
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed ignition coil
- 2 Fouled spark plug
- 3 Faulty injector
- 4 Low compression
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Confirm the cylinder with live misfire counters.
- ✓ Swap the coil and plug with a neighbouring cylinder.
- ✓ Swap the injector if ignition checks out.
- ✓ Compression test if the misfire does not move.
维修方案
- Replace ignition parts
- Service the injector
- Mechanical repair if compression is down
P0304 —— 常见问题
Why does it only misfire when cold? +
A small head-gasket leak or a marginal valve seal often seals up as the engine warms and metal expands.
Should I replace all coils at once? +
If they share age and mileage, yes — the next one is usually not far behind.