* Fuel System: Is there fuel in the tank? Is the fuel pump working (you might hear it hum)? Are the fuel lines clear and not clogged? Is the fuel filter clean? Is the carburetor (if equipped) functioning properly – getting fuel, correct mixture? Is there sufficient fuel pressure?
* Ignition System: Does the engine have spark? This requires checking the ignition coil, distributor cap and rotor, spark plug wires, and spark plugs themselves. A faulty ignition switch, ignition module (if equipped), or even a bad crankshaft position sensor (on later models, though less likely on a '74) could also prevent firing.
* Compression: Does the engine have sufficient compression in all cylinders? Low compression indicates worn rings, valves, or head gasket issues. A compression test is needed to diagnose this.
* Timing: Is the engine's ignition timing correctly set? An incorrectly timed engine won't fire properly or at all.
* Starter Motor: Does the starter motor crank the engine over? A weak or faulty starter won't turn the engine fast enough to start. A bad battery or poor connections can also prevent cranking.
To determine *why* your specific 1974 Camaro 250ci 6 isn't firing, you'll need to systematically check these areas. A repair manual specific to your vehicle's year and engine is a great help. A multimeter to test electrical components is also essential. If you're not comfortable working on your engine yourself, take it to a qualified mechanic.
