* Battery: A dead or weak battery is the most frequent cause. Check the battery terminals for corrosion and have the battery tested at an auto parts store.
* Alternator: The alternator charges the battery while the engine is running. A faulty alternator will leave the battery drained, preventing the car from starting. A visual inspection can sometimes reveal problems, but testing is necessary for a definitive answer.
* Starter Motor: This is the motor that cranks the engine. A failing starter can make a clicking sound, crank slowly, or not crank at all. This often requires professional diagnosis and replacement.
* Ignition System: This includes the ignition switch, ignition coil, distributor (if equipped), and spark plugs/wires. Problems in any of these components can prevent the engine from firing. A faulty ignition switch might not even turn the starter. Worn spark plugs or bad wires will result in misfires or no spark.
* Fuel System: No fuel means no combustion. Check the fuel pump (it might make a humming sound when you turn the key), fuel filter, and fuel lines for blockages or leaks. A bad fuel pump relay can also be a problem.
* Sensors: Modern cars have many sensors, and even the 1978 Delta 88 likely has some that control aspects of the ignition and fuel delivery. A faulty sensor can prevent the engine from starting or running correctly.
* Carburetor (if equipped): If it has a carburetor, it might be clogged, need adjustment, or have a faulty choke.
* Security System (if equipped): Some older cars, even from 1978, had aftermarket security systems that could prevent the car from starting.
To troubleshoot:
1. Check the obvious: Battery terminals, battery voltage, and the simplest things first.
2. Listen carefully: Does the starter crank? Do you hear any unusual sounds? A clicking sound usually points to a low battery or starter problem.
3. Consult a repair manual: A repair manual specific to a 1978 Oldsmobile Delta 88 will have diagrams and troubleshooting steps.
4. Seek professional help: If you're not comfortable working on cars, take it to a mechanic for diagnosis and repair. Trying to fix it yourself without knowledge can lead to further damage.
Providing more details about the symptoms (e.g., clicking sounds, lights dimming, engine turning over slowly or not at all) will help narrow down the possibilities.
