1. The Basics:
* Battery: Check the battery voltage. A weak battery can prevent the ignition system from working properly. Test the voltage with a multimeter.
* Fuses: Inspect the fuses related to the ignition system in the fuse box (under the hood and possibly inside the car). A blown fuse will prevent power from reaching components. Check the owner's manual for fuse locations and ratings.
* Ignition Switch: Try wiggling the key in the ignition. A faulty ignition switch can interrupt power to the system. If you suspect this, it's often best to have a mechanic diagnose it.
2. Ignition System Components:
* Crank Position Sensor (CKP): This sensor tells the computer the position of the crankshaft. Without a signal, the computer won't send the spark signal. A bad CKP sensor is a common cause of no spark.
* Cam Position Sensor (CMP): Similar to the CKP, this sensor tells the computer the position of the camshaft. Issues here can also prevent spark.
* Ignition Coil: This coil boosts the voltage to create the spark. A bad coil will result in no spark or weak spark. You might be able to visually inspect for cracks or damage, but testing with a multimeter is best.
* Ignition Control Module (ICM) or Engine Control Module (ECM): These modules control the ignition system. A faulty module can prevent the spark. These require more advanced diagnostic tools to test.
* Distributor (if equipped): Older cars may have a distributor. Check the rotor, cap, and wires for cracks, corrosion, or wear.
3. Wiring:
* Ignition Wiring: Inspect the wiring harness for any broken, frayed, or corroded wires, particularly those leading to the ignition components.
* Grounds: A poor ground connection can disrupt the electrical flow. Check all ground wires related to the ignition system.
Troubleshooting Steps:
1. Start with the simple checks (battery, fuses).
2. Visually inspect the ignition components (coil, distributor if applicable, wiring). Look for obvious damage.
3. Use a multimeter to test battery voltage, and to test the ignition coil and sensors for continuity and proper voltage. You'll need a wiring diagram or service manual to know where to connect the multimeter.
4. If you're not comfortable with electrical testing, take it to a mechanic. Diagnosing ignition problems requires some knowledge of automotive electrical systems.
Important Note: A service manual specific to your 1998 Dodge Stratus is highly recommended. It will provide wiring diagrams, component locations, and troubleshooting procedures specific to your vehicle. You can often find these online (PDF versions are common) or at auto parts stores. Using a multimeter correctly is crucial for accurate diagnosis. If you are unsure, professional help is the safest option.
