Fuel System:
* Dirty Fuel Filter: This is the easiest and cheapest thing to check first. A clogged filter restricts fuel flow, causing sputtering, especially under acceleration when the engine demands more fuel.
* Fuel Pump: A weak or failing fuel pump can't deliver enough fuel under load, leading to sputtering. You might hear a whining noise from the tank if the pump is failing.
* Clogged Fuel Injectors: These injectors spray fuel into the cylinders. Buildup of deposits can hinder their operation, causing a misfire and sputtering. Cleaning or replacing them may be necessary.
* Low Fuel Pressure: A pressure regulator problem can cause insufficient fuel pressure.
* Bad Fuel: Contaminated fuel can cause sputtering and rough running. Try a different gas station.
Ignition System:
* Worn Spark Plug Wires: Cracks or damage in the wires can prevent a proper spark, resulting in misfires and sputtering.
* Faulty Spark Plugs: Worn, fouled, or damaged spark plugs are a common cause of sputtering.
* Distributor Cap and Rotor (if applicable): These parts distribute the spark to the spark plugs. Cracks or corrosion can interrupt the spark. (Note: Some 1995 Cherokees may have coil-pack ignition instead of a distributor.)
* Ignition Coil(s): A failing coil won't deliver enough spark to one or more cylinders.
Air Intake System:
* Dirty Air Filter: A clogged air filter restricts airflow, leading to a lean fuel mixture and rough running.
* Vacuum Leaks: Leaks in the vacuum lines can disrupt the fuel/air mixture.
Other Possibilities:
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A faulty MAF sensor can cause incorrect fuel delivery.
* Throttle Position Sensor (TPS): This sensor tells the computer the throttle position. A faulty TPS can lead to poor engine performance.
* Computer/ECU Issues: While less common, a problem with the engine control unit (ECU) can cause various issues, including sputtering.
Troubleshooting Steps:
1. Start with the easy stuff: Check the air filter, fuel filter, and spark plugs. These are relatively inexpensive and easy to replace.
2. Listen for unusual noises: Pay attention to any whining from the fuel pump or unusual clicking sounds from the ignition system.
3. Check engine codes: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored by the ECU. This can pinpoint the problem area.
4. Visual Inspection: Examine the vacuum lines for cracks or leaks. Check spark plug wires for damage.
5. Professional Diagnosis: If you're not comfortable diagnosing the problem yourself, take your Jeep to a mechanic.
Remember to always consult your owner's manual for specific maintenance procedures and safety precautions. Good luck!
