* Ignition System Issues: This is the most common cause. Problems could include:
* Spark plugs: Worn, fouled, damaged, or incorrectly gapped spark plugs prevent proper combustion.
* Ignition wires: Cracked, frayed, or loose wires can disrupt the spark delivery to the plugs.
* Ignition coil: A failing ignition coil (or coil pack, depending on the engine) won't supply sufficient voltage to the spark plugs.
* Distributor cap and rotor (if applicable): These components, if present in your specific Cavalier engine, can become worn or damaged, affecting spark distribution.
* Crankshaft position sensor (CKP sensor): This sensor tells the computer the engine's rotational position, vital for accurate ignition timing. A malfunctioning sensor will lead to misfires.
* Fuel System Problems: While less common than ignition issues, a misfire can be caused by:
* Fuel injectors: Clogged or failing fuel injectors can deliver an incorrect amount of fuel to the cylinders, leading to inconsistent combustion.
* Fuel pump: A weak or failing fuel pump may not provide enough fuel pressure.
* Fuel filter: A clogged fuel filter restricts fuel flow.
* Engine Mechanical Issues: Less frequent but still possible causes include:
* Vacuum leaks: Leaks in the intake manifold or vacuum lines disrupt the air/fuel mixture.
* Low compression: Worn piston rings or valve problems can reduce cylinder compression, causing misfires.
What to Do:
* DO NOT IGNORE IT: Continued driving with a flashing check engine light can severely damage your engine.
* Get it checked immediately: Take your Cavalier to a mechanic as soon as possible. They will use an OBD-II scanner (though a 1995 might require an older scanner) to read the trouble codes stored in the car's computer. This will pinpoint the specific problem causing the misfire.
* Avoid high RPMs: Don't rev the engine excessively until the problem is diagnosed and fixed.
The age of your car increases the likelihood that multiple components are failing simultaneously or contributing to the problem. A thorough inspection by a qualified mechanic is essential to identify and address the root cause.
