1. Misfiring Engine: A faulty spark plug, ignition coil, or fuel injector can cause the engine to misfire. This can lead to rough idling, stuttering acceleration, and check engine light flashing.
2. Fuel Supply Issues: Insufficient fuel supply due to a clogged fuel filter, faulty fuel pump, or leaking fuel injector can cause the engine to run poorly and trigger the check engine light.
3. Vacuum Leak: A vacuum leak in the intake system can cause a lean air-fuel mixture, leading to rough engine operation and an illuminated check engine light.
4. Faulty Sensors: Malfunctioning sensors, such as the oxygen sensor, mass airflow sensor (MAF), or throttle position sensor (TPS), can disrupt the engine's air-fuel ratio and ignition timing, causing it to run roughly and triggering the check engine light.
5. Engine Control Module (ECM) Issues: Problems with the ECM, the computer that controls the engine's operation, can also lead to rough running and the check engine light flashing. Software glitches, faulty connections, or hardware failures can affect the ECM's ability to manage engine functions effectively.
6. Catalytic Converter Issues: A clogged or damaged catalytic converter can restrict exhaust flow and cause the engine to run rough. Additionally, it can trigger the check engine light to indicate emission control system problems.
7. Transmission Problems: Although not as common, transmission issues like slipping or delayed shifting can also cause the engine to rev irregularly, resulting in rough running and potential check engine light illumination.
It's crucial to retrieve and analyze the specific trouble codes stored in the vehicle's computer to diagnose the exact cause of the rough running and flashing check engine light. You can either connect an OBD-II scanner or have a professional mechanic perform the diagnostics to identify the root of the problem.
