Possible Causes:
* Oxygen Sensor: A faulty oxygen sensor can disrupt the air-fuel mixture, leading to rough idling and triggering the check engine light.
* Spark Plugs & Wires: Worn or damaged spark plugs and wires can cause misfires, affecting engine performance and causing the light to come on.
* Fuel Injectors: Clogged or faulty fuel injectors can prevent the proper delivery of fuel, resulting in a rough idle and engine problems.
* Mass Air Flow (MAF) Sensor: This sensor measures the amount of air entering the engine. A faulty MAF sensor can throw off the air-fuel mixture, causing the check engine light to illuminate.
* Vacuum Leaks: A vacuum leak can disrupt engine performance, leading to rough idling and the check engine light.
* Engine Control Module (ECM): A malfunctioning ECM can cause various problems, including rough idling and the check engine light.
* Ignition System: Issues with the ignition system, such as a failing distributor cap or rotor, can cause misfires and trigger the check engine light.
* Fuel Filter: A clogged fuel filter can restrict fuel flow, leading to a rough idle and engine performance problems.
* Engine Sensors: Other sensors, such as the throttle position sensor or coolant temperature sensor, can also contribute to rough idling and the check engine light if faulty.
How to Proceed:
1. Get a Code Read: The first step is to have the check engine light codes read. This can be done at a local auto parts store (usually free) or by a mechanic. The codes will provide valuable information about the potential issues.
2. Inspect for Obvious Problems: Check for any visible signs of problems, such as loose wires, cracked hoses, or damaged parts.
3. Consult a Mechanic: Once you have the codes and have done a visual inspection, it's best to consult a mechanic. They can perform further diagnostics and determine the exact cause of the rough idling and check engine light.
Additional Tips:
* Check the Engine Oil: Make sure your engine oil level is adequate. Low oil can cause engine problems.
* Add Fuel System Cleaner: Adding a fuel system cleaner to your tank might help clean out clogged injectors or fuel lines, but it's not a guaranteed solution.
* Don't Ignore the Check Engine Light: Driving with the check engine light on can lead to more serious engine problems. Addressing the issue promptly is important.
Remember, troubleshooting car issues can be complex. It's usually a good idea to let a mechanic do the diagnostics and repairs for your 1996 Ford Explorer.
