What are the causes of multi-cylinder misfire in the H6?
2 Answers
There are many reasons for multi-cylinder misfire in the H6, which can be mainly divided into the following three aspects: 1. Damage to external components: This is caused by the damage of external components, mainly including the combustion chamber surrounding parts such as valves, valve seat rings, valve guides, and spark plugs. Typically, check the spark plugs, clean the carbon deposits on the intake and exhaust valves, and inspect whether the turbocharger has any issues, such as wear or burning of the turbocharger impeller. 2. Failure to ignite the air-fuel mixture: Misfire caused by the inability or delayed ignition of the air-fuel mixture in the cylinder. This is usually due to an abnormality in a certain component or part, which causes the ECU to regulate the engine unstably, failing to meet the theoretical value calibrated by the ECU, resulting in misfire. 3. Other reasons: If there is poor spark between the spark plugs at a certain moment, cylinder misfire will occur; if the self-induced voltage of the injector coil in a certain cylinder is too high, it may cause sticking or incomplete closure in the next working cycle, leading to poor operation and misfire in that cylinder; if the high-power transistor inside the computer board has poor heat dissipation at a certain moment, it may cause the switching transistor to stop working momentarily, leading to the ignition coil or independent ignition module not working, and thus causing no ignition.
I've worked on many Haval H6 owners complaining about multi-cylinder misfire issues. Simply put, it's when several cylinders in the engine fail to ignite, causing shaking and power loss. Common causes include: first, ignition system failures like worn spark plugs or faulty ignition coils directly affecting spark generation; second, fuel supply issues such as clogged injectors or insufficient fuel pump pressure disrupting steady fuel delivery; third, sensor malfunctions like inaccurate crankshaft position sensor readings leading to ECU misjudgment; air system leaks or carbon buildup can also interfere with air-fuel mixture. As a technician, I recommend first using an OBD scanner to read trouble codes and locate the problem area, prioritizing inspection of wear-prone parts like spark plugs. If replacement doesn't solve it, clean the fuel system or check the ECU. Delaying repairs increases engine strain, raises fuel consumption, and may damage the catalytic converter in severe cases. While Haval H6 engines are relatively durable, high-mileage vehicles require special attention to routine maintenance - regular spark plug and air filter replacements can significantly reduce risks.
