* Misfire(s): This is the most common cause. A misfire occurs when one or more cylinders aren't firing properly. This can be due to:
* Spark plug problems: Worn, fouled, or damaged spark plugs.
* Ignition coil issues: A faulty ignition coil (which supplies voltage to the spark plugs) can cause misfires in one or more cylinders.
* Worn or damaged wires: Worn or damaged spark plug wires can prevent proper spark delivery.
* Fuel injector problems: A clogged or malfunctioning fuel injector can prevent fuel from reaching the cylinder.
* Low fuel pressure: Problems with the fuel pump or fuel filter can lead to insufficient fuel pressure.
* Valvetrain problems: Burnt valves, sticking lifters, or other valvetrain issues can disrupt the combustion process.
* Compression issues: Low compression in one or more cylinders can prevent a proper combustion.
* Catalytic Converter Problems: A severely clogged catalytic converter can cause back pressure that leads to misfires and a flashing check engine light.
Crucially, continuing to drive with a flashing check engine light risks severe engine damage. You should immediately:
* Reduce speed and safely pull over: Avoid high RPMs and excessive acceleration.
* Have the vehicle towed or driven very carefully to a mechanic: Don't try to diagnose and fix the problem yourself unless you're experienced.
* Get the diagnostic trouble codes (DTCs) read: A mechanic will use a scan tool to read the codes stored by the car's computer, which will pinpoint the likely cause.
Ignoring a flashing check engine light could lead to costly engine repairs, including damage to pistons, connecting rods, or even a catastrophic engine failure. It's best to address this immediately.
