Here's why:
* Misfire: A blinking check engine light almost always means a cylinder(s) is/are misfiring. This means the spark plug isn't igniting the air/fuel mixture properly in one or more cylinders. This is causing the rough running you're experiencing.
* Potential Causes of Misfire (requiring immediate attention):
* Worn Spark Plugs: These are the most common culprit. If they're worn or fouled, they won't ignite the fuel properly.
* Worn Spark Plug Wires: Damaged or cracked wires can prevent proper spark delivery.
* Bad Ignition Coil: The ignition coil supplies the high voltage needed for the spark plugs. A faulty coil can affect one or more cylinders.
* Faulty Fuel Injector: A clogged or malfunctioning injector prevents fuel from reaching the cylinder.
* Low Fuel Pressure: Problems with the fuel pump or fuel filter can lead to insufficient fuel delivery.
* Severe Engine Problems: In more severe cases, a blinking light could indicate internal engine damage like a broken piston, bent connecting rod, or other significant mechanical failure. This is less likely but still possible.
What you should do:
1. Stop driving the car immediately. Continuing to drive with a misfire can cause severe engine damage.
2. Have the car towed to a qualified mechanic or auto repair shop. Do not attempt to diagnose and repair this yourself unless you have extensive automotive experience.
3. Get the diagnostic trouble codes (DTCs) read. A mechanic will use an OBD-II scanner to read the codes stored by the car's computer. These codes will pinpoint the likely cause of the problem.
Ignoring a blinking check engine light and rough running can lead to costly engine repairs, or even a complete engine failure. Professional diagnosis and repair are crucial in this situation.
