I. Fuel System:
* Empty Tank: The most obvious! Check your fuel gauge and add gas if needed.
* Fuel Pump Failure: The pump might be dead, weak, or not receiving power. You can listen for the hum of the pump when the key is turned to the "on" position (but not cranking). Lack of a hum often indicates a failed pump or a faulty relay/fuse.
* Clogged Fuel Filter: Restricts fuel flow. A simple and relatively inexpensive part to replace.
* Fuel Injector Problems: Injectors might be clogged, faulty, or not receiving the correct signal. This often requires specialized tools and knowledge to diagnose.
* Fuel Pressure Issues: Low fuel pressure prevents proper atomization of the fuel. Requires a fuel pressure gauge to diagnose.
II. Ignition System:
* Dead Battery: Test the battery voltage. A weak or dead battery won't crank the engine.
* Corroded Battery Terminals: Clean the terminals with a wire brush and baking soda solution.
* Faulty Starter: The starter motor might be failing to engage or turn the engine over. This often results in a clicking sound when you turn the key.
* Bad Ignition Switch: The switch might be failing to send power to the ignition system.
* Ignition Coil Failure: Provides the high voltage spark to the spark plugs. A visual inspection for cracks or damage might reveal problems, but further testing may be needed.
* Distributor Problems (if applicable): Issues with the distributor cap, rotor, or ignition module can prevent spark. Look for cracks, corrosion, or worn components. This is less likely on a TBI model (Throttle Body Injection).
* Spark Plug Issues: Worn, fouled, or damaged spark plugs prevent proper combustion. Inspect for wear, cracks, or fouling.
* Wiring Issues: Damaged or corroded wiring anywhere in the ignition system can interrupt the spark.
III. Other Potential Problems:
* Security System (if equipped): An aftermarket or factory alarm system might be preventing the car from starting.
* Computer Issues (PCM): The Powertrain Control Module might be malfunctioning, although this is less common as a primary cause of a no-start condition.
* Sensor Problems: Various sensors (like the crankshaft position sensor, camshaft position sensor, etc.) provide data to the PCM. A faulty sensor can cause a no-start. Often requires diagnostic scanning tools.
* Alternator: While not directly preventing starting, a dead alternator won't recharge the battery, making it difficult to start again after several attempts.
Troubleshooting Steps:
1. Start with the basics: Check the battery, fuel level, and obvious visual inspections (wires, fuses, etc.).
2. Listen for clues: Does the engine crank but not start (fuel problem)? Do you hear clicking (starter problem)? Is there no sound at all (battery or ignition switch problem)?
3. Use a multimeter: Test the battery voltage, check for power at the fuel pump, and test the ignition system components.
4. Consult a repair manual: A specific repair manual for your 1990 Chevy Camaro RS 305 will provide diagrams and troubleshooting procedures.
5. Consider professional help: If you're not comfortable working on your car's electrical system, it's best to take it to a qualified mechanic.
Remember safety first! Disconnect the battery negative terminal before working on any electrical components. This will prevent accidental shorts and shocks.
