Fuel System:
* Empty or low fuel: The most obvious and easily solved.
* Fuel pump failure: The pump isn't delivering fuel to the engine.
* Clogged fuel filter: Restricts fuel flow.
* Fuel injector problems: Injectors may be clogged, malfunctioning, or not delivering fuel properly.
* Fuel pressure regulator issues: Regulator isn't maintaining the correct fuel pressure.
* Bad fuel: Contaminated fuel can cause engine problems.
Ignition System:
* Spark plug issues: Worn, fouled, or damaged spark plugs prevent proper ignition.
* Ignition coil failure: The coil doesn't provide the necessary high voltage for sparking.
* Distributor cap or rotor problems (older vehicles): These components can wear out and cause ignition issues.
* Crankshaft position sensor (CKP) or camshaft position sensor (CMP) failure: These sensors tell the engine's computer the position of the crankshaft and camshaft; failure leads to improper ignition timing.
Engine Mechanical Issues:
* Low compression: Leaks in the cylinders reduce engine power.
* Broken timing belt or chain: This is a catastrophic failure that can severely damage the engine.
* Valve train problems: Bent valves, sticking lifters, or worn camshafts can impact engine performance.
* Worn piston rings: Leads to low compression.
* Seized engine: This is a complete engine failure.
Transmission Issues (Automatic):
* Transmission fluid issues: Low fluid, contaminated fluid, or fluid leaks.
* Transmission failure: A major mechanical problem requiring significant repair.
* Torque converter problems: The torque converter may be slipping or failing.
Other Potential Causes:
* Alternator failure: Stops charging the battery, eventually leading to power loss.
* Battery issues: A dead or failing battery can cut power to the engine.
* Mass airflow sensor (MAF) problems: The sensor measures the amount of air entering the engine; a faulty sensor leads to incorrect fuel mixture.
* Throttle position sensor (TPS) problems: The sensor monitors the throttle position; a faulty sensor can cause poor engine performance.
* Vacuum leaks: Leaks in the vacuum system can disrupt engine operation.
* Overheating: An overheated engine will reduce power to prevent further damage.
Important Note: If your vehicle loses power while driving, safely pull over to the side of the road. Attempting to diagnose the problem while driving can be extremely dangerous. It's best to have the vehicle towed to a mechanic for proper diagnosis and repair.
