1. Fuel System:
* Empty Tank: The most obvious – check your fuel gauge and add fuel if needed.
* Fuel Pump: Listen carefully near the fuel tank for the whirring sound of the fuel pump when you turn the key to the "on" position (but before cranking). If you don't hear it, the pump might be bad, the relay might be faulty, or there could be a wiring issue.
* Fuel Filter: A clogged fuel filter will restrict fuel flow. This is a relatively inexpensive and easy part to replace.
* Fuel Pressure: You'll need a fuel pressure gauge to check the pressure at the fuel rail. This requires specialized tools and knowledge. A low or no pressure reading indicates a problem in the fuel delivery system.
* Fuel Injectors: Clogged or faulty injectors won't spray fuel properly. Testing these usually requires specialized tools.
2. Ignition System:
* Spark: Check for spark at the spark plugs. A simple spark tester can be used. No spark points to problems with the ignition coil, distributor cap, rotor, ignition module, or crankshaft position sensor (CKP sensor).
* Ignition Coil: A weak or failing coil won't produce enough spark.
* Distributor Cap and Rotor: These parts can wear out, causing poor spark delivery. Inspect for cracks, corrosion, or worn contacts.
* Ignition Module: This is a common failure point in older Corvettes.
* Crankshaft Position Sensor (CKP): This sensor tells the ignition system when to fire the spark plugs. A faulty CKP will prevent the engine from starting.
3. Other Potential Issues:
* Battery: A weak battery might crank the engine slowly, preventing it from starting. Check the battery voltage.
* Alternator: While it doesn't directly affect starting, a bad alternator could have drained the battery.
* Security System: If your Corvette has an aftermarket or factory alarm system, it might be preventing the engine from starting. Check for any alarm indicators.
* Computer/ECM Problems: A faulty Engine Control Module (ECM) can cause a myriad of starting problems. Diagnosing this usually requires a scan tool.
* Throttle Position Sensor (TPS): A faulty TPS can prevent the engine from starting.
Troubleshooting Steps:
1. Check the basics: Fuel level, battery voltage.
2. Listen for the fuel pump.
3. Check for spark at the spark plugs.
4. Inspect the distributor cap and rotor.
5. If you have basic mechanical skills, you can try replacing the fuel filter as a low cost/easy first step.
If you're not comfortable working on your car yourself, take it to a qualified mechanic. They have the tools and expertise to diagnose the problem accurately and efficiently. Mentioning the specific symptoms ("cranks but won't start") will help them narrow down the possibilities.
