* Dead Battery: This is the most common culprit. Two years is a long time for a battery to sit unused. It likely needs charging or replacing.
* Fuel System Issues: Beyond the relay, the fuel pump itself could be bad (common after prolonged sitting), or there could be clogged fuel lines or a filter that's blocked. The gas you added to the throttle body might have gotten it to sputter, but the fuel *system* needs to deliver fuel consistently.
* Corrosion: Two years of sitting can lead to corrosion in various electrical connections, especially in the engine bay. This can prevent current from flowing to the starter or fuel pump.
* Old Gas: Even if the gas tank wasn't completely empty, the fuel that remains after two years is likely deteriorated and gummed up. This can clog injectors and fuel lines.
* Ignition System: While less likely if it ran fine previously, problems with the ignition coil, distributor (if equipped), spark plugs, or wires can also prevent starting.
Troubleshooting Steps:
1. Battery: The absolute FIRST step is to check the battery voltage with a multimeter. If it's low, jumpstart it or charge it. Even if it starts, you may need a new battery.
2. Fuel Pump: Listen carefully near the fuel tank while someone tries to crank the engine. You should hear the fuel pump whirring for a few seconds when the ignition is turned on (before cranking). If you don't hear it, check the fuel pump relay (location varies by model, consult a repair manual or online forum). If the relay is good, the pump may have failed.
3. Fuel Delivery: Check the fuel filter; it may be clogged. Also, you'll want to check the fuel pressure to determine if fuel is getting to the fuel rail.
4. Spark: Check for spark at the spark plugs. If there's no spark, the ignition system needs attention.
5. Corrosion: Inspect all electrical connections in the engine bay for corrosion. Clean them with a wire brush and dielectric grease.
6. Drain and Replace Fuel: Because of fuel degradation, draining the old gas is highly recommended. Replace with fresh fuel. You might also want to use fuel system cleaner to help clear any clogs.
In short: Pouring gas into the throttle body is a temporary band-aid. You need to diagnose the underlying cause, and the battery and fuel system are the most likely culprits after prolonged sitting. A repair manual specific to your 1993 Dodge Shadow will be invaluable in this process. Online forums dedicated to Dodge Shadows are also great resources for troubleshooting.
