P1399 HONDA - Random Cylinder Misfire Detected
- Blocked EGR (exhaust gas recirculation) Passages
- Lack/loss of power
- Hard start
- Engine hesitation
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
- Valve clearance out of range