What are the causes of engine misfire?
1 Answers
Common causes of engine misfire include damaged ignition coils, insufficient air flow, intake system leaks, improper fuel pressure, and dirty or clogged fuel injectors. Below are detailed explanations and their solutions: Damaged ignition coil: Due to poor contact or excessive resistance, the ignition coil of the corresponding cylinder may become damaged, easily leading to engine misfire. In this case, the ignition coil needs to be replaced. Insufficient air flow: The powertrain control module detects that the output of the mass air flow (MAF) sensor is lower than the normal air flow, causing the air-fuel mixture to become too lean, and the exhaust gas recirculation (EGR) valve to malfunction. Professional repair shop inspection is required. Intake system leak: Air leaking into the intake system bypasses the mass air flow sensor, causing the air-fuel mixture to become too lean. Check for disconnected or damaged vacuum hoses. Improper fuel pressure: Faulty fuel pump, clogged fuel filter, or malfunctioning fuel pressure regulator can lead to improper fuel pressure, resulting in an overly lean mixture. Replace the fuel pump. Dirty or clogged fuel injector: Causes poor fuel atomization; damaged O-ring on the fuel injector. Poor fuel injector control circuit can lead to prolonged fuel injection or no injection. Clean the dirty fuel injector.