* Fuel System Issues: This is a very common cause. The sputtering suggests a problem with fuel delivery. Possibilities include:
* Clogged Fuel Filter: A dirty fuel filter restricts fuel flow to the engine. This is a relatively inexpensive and easy fix.
* Faulty Fuel Pump: The fuel pump might be failing, unable to deliver sufficient fuel pressure.
* Clogged Fuel Injector(s): A clogged injector prevents proper fuel atomization, leading to a rough running engine and sputtering.
* Low Fuel Pressure: A leak in the fuel lines or a faulty fuel pressure regulator could cause low pressure.
* Ignition System Problems: These can also cause sputtering:
* Spark Plugs/Wires: Worn, fouled, or damaged spark plugs or ignition wires can prevent proper combustion.
* Ignition Coil: A failing ignition coil can cause misfires in one or more cylinders.
* Mass Airflow Sensor (MAF) Sensor: This sensor measures the amount of air entering the engine. A faulty MAF sensor can provide inaccurate readings, leading to a lean or rich fuel mixture and poor engine performance.
* Crankshaft Position Sensor (CKP) Sensor: This sensor tells the engine's computer where the crankshaft is in its rotation. A bad CKP sensor can disrupt ignition timing, causing misfires and sputtering.
* Throttle Position Sensor (TPS): A faulty TPS can cause the engine to run poorly, and it's fairly common on older vehicles.
What you should DO:
1. Don't drive it excessively. Continued driving with a severely sputtering engine can cause catastrophic damage.
2. Get the codes read: The check engine light stores diagnostic trouble codes (DTCs). You can buy a relatively inexpensive OBD-II code reader from an auto parts store or have it scanned at a mechanic's shop. The codes will give you a much better idea of what's wrong.
3. Check obvious things: Before taking it to a mechanic, quickly check your fuel level (it's possible you simply ran low), and visually inspect your fuel lines for any obvious leaks.
4. Take it to a mechanic: Based on the codes and your initial observations, a qualified mechanic can diagnose and repair the problem properly. Ignoring this could lead to costly repairs down the road.
Without knowing the specific trouble codes, it's impossible to pinpoint the exact cause. The codes are crucial for proper diagnosis.
