Engine misfire issues are commonly attributed to faults in the ignition system and fuel injection system. In terms of the ignition system, misfire can result from spark plug erosion, failure to spark, damage to the high-tension coil, and relay malfunctions. Additionally, a malfunctioning Engine Control Unit (ECU) can also impact the ignition function of the high-tension coil.
For ignition system issues, several solutions can be applied.
Firstly, timely replacement of spark plugs, as specified in the vehicle maintenance manual, is necessary. Simultaneously, use a multimeter to test the resistance value of the high-tension coil, ensuring it falls within the normal range (primary resistance is typically around 1-4 ohms, secondary resistance usually between 8000-16000 ohms).
Furthermore, assess relay functionality through testing or listening for the normal "clicking" sound during ignition. If ECU issues are suspected, seeking professional diagnostic tools for inspection is advisable.
In the context of the fuel injection system, insufficient fuel pressure, fuel line damage, worn-out fuel pump in the tank, clogged gasoline filters, inadequate high-pressure pump pressure, and clogged or inefficient fuel injectors can all lead to engine misfire.
A common scenario is excessive vaporization of gasoline due to oil dripping from the fuel injector, causing the spark plug to lose its ability to spark.
Regarding the repair cost for misfire issues, the specific expense varies based on the cause of the malfunction and the vehicle model. If misfire is caused by spark plugs, high-tension coil, relay, related damage, or clogged gasoline filters, the repair cost is usually relatively inexpensive.
However, if components like ignition ECU, high-pressure fuel pump, or tank fuel pump are damaged, the cost of repair and replacement may be higher.
