Ignition System:
* Distributor Cap and Rotor: Wear and tear, cracks, or carbon buildup can prevent proper spark delivery. Inspect for damage and consider replacement.
* Spark Plugs and Wires: Worn or damaged spark plugs and wires can prevent a strong spark reaching the cylinders. Check for wear, cracks, and proper connection.
* Ignition Coil: A failing ignition coil won't produce the high voltage needed for sparking. Testing is necessary to diagnose this.
* Ignition Control Module (ICM): This module controls the ignition timing and spark. Failure can prevent the engine from starting. This is a common issue in older GM vehicles.
* Crankshaft Position Sensor (CKP): The computer needs this sensor to know the engine's rotational position to time the spark correctly. A faulty sensor will prevent starting.
* Cam Position Sensor (CMP): Similar to the CKP, this sensor is crucial for proper ignition timing in some models.
Fuel System:
* Fuel Pump: A failing fuel pump might not deliver enough fuel pressure to the injectors. Listen for the pump's whirring sound when the key is turned to the "on" position (but not started). If you don't hear it, or it sounds weak, the pump is a suspect.
* Fuel Filter: A clogged fuel filter restricts fuel flow. Regular replacement is recommended.
* Fuel Injectors: Clogged or faulty injectors won't spray fuel properly into the cylinders. Testing is required to diagnose this.
* Fuel Pressure Regulator: A faulty regulator could cause incorrect fuel pressure.
Engine Problems:
* Timing Belt/Chain: A broken or severely slipped timing belt or chain will result in no combustion. If the belt is broken, you'll likely hear a distinct "snap" upon attempting to start it.
* Low Compression: Worn piston rings, valve problems, or a blown head gasket can lead to low compression, preventing the engine from starting. A compression test is necessary.
* Security System: Some 1994 models might have a security system that's preventing the engine from starting. Check for any error codes or lights.
Troubleshooting Steps:
1. Check for obvious signs: Look for any error codes or warning lights on the dashboard.
2. Listen for the fuel pump: Does it prime when you turn the key to "on"?
3. Check the spark plugs: Are they wet with fuel? (Indicates a possible ignition problem.) Are they dry? (Indicates a possible fuel delivery problem.)
4. Test the spark: A simple spark tester can determine if the ignition system is delivering a spark.
5. Get a diagnostic scan: A code reader will identify fault codes stored by the car's computer. This is often the fastest way to narrow down the problem.
Important Note: Without a proper diagnostic scan or further testing, it's difficult to pinpoint the exact cause. It's best to take the vehicle to a qualified mechanic for diagnosis and repair. Attempting some repairs without the proper knowledge could lead to further damage.
