Here are some possibilities, but remember this is not a diagnosis, just a list of potential problems associated with those symptoms:
* Oxygen Sensor(s): A faulty oxygen sensor can drastically affect fuel mixture, leading to poor power and a check engine light. These are relatively common to fail on older vehicles.
* Mass Airflow Sensor (MAF): The MAF sensor measures the amount of air entering the engine. A faulty sensor provides incorrect information to the computer, resulting in a lean or rich fuel mixture, impacting power and triggering the light.
* Throttle Position Sensor (TPS): This sensor tells the computer the position of the throttle. A malfunctioning TPS can lead to inconsistent fuel delivery and poor performance.
* Catalytic Converter: A clogged catalytic converter restricts exhaust flow, reducing engine power and often setting off a check engine light. This is a more expensive repair.
* Ignition System Problems: Issues with spark plugs, ignition wires, distributor cap (if applicable), or ignition coil can cause misfires, reduced power, and the check engine light to illuminate.
* Fuel Pump/Fuel Filter: A weak fuel pump or a clogged fuel filter can restrict fuel delivery, resulting in poor acceleration and a check engine light in some cases.
* Vacuum Leaks: Leaks in the vacuum system can disrupt engine timing and air/fuel mixture.
* Crankshaft Position Sensor (CKP): This sensor is crucial for engine timing; a malfunction can lead to serious power loss and misfires.
* PCV Valve (Positive Crankcase Ventilation): A clogged PCV valve can cause excessive pressure build-up in the crankcase, impacting engine performance.
What to do:
1. Get the diagnostic trouble code (DTC) read: This is the most important step. The code will narrow down the possibilities significantly.
2. Don't ignore the problem: Continuing to drive with a lack of power and a check engine light could cause further damage to your engine.
3. Once you have the code, research it online. Many websites and forums provide information on specific trouble codes and their potential causes.
4. Consider the age and condition of your car: Repairing some of these issues might not be cost-effective on a 1998 vehicle. Weigh the cost of repairs against the vehicle's overall value.
Without the diagnostic code, any further troubleshooting is just guesswork. Getting the code read is the first, and most important, step.
