1. Power and Ground:
* Battery: Check the battery voltage. A weak or dead battery can prevent the fuel pump and ignition system from functioning. Start the car with jumper cables from a known good battery to rule this out.
* Battery Connections: Corroded or loose battery terminals can also interrupt power. Clean them thoroughly.
* Grounds: Poor grounds can also affect various systems. Check the main ground straps from the engine to the chassis and battery. Look for corrosion or loose connections.
2. Ignition System (No Spark):
* Crankshaft Position Sensor (CKP): This sensor is crucial for the ignition system. A faulty CKP sensor won't allow the computer to know where the engine is in its rotation, preventing spark. These are known to fail on this era of Chrysler cars.
* Ignition Control Module (ICM): The ICM receives signals from the CKP and other sensors and controls the ignition coil. A failing ICM is a common culprit for no spark.
* Ignition Coil: While less likely if you have *no* spark, a completely failed coil will prevent spark. However, it's more common to see a weak spark with a bad coil, leading to poor or intermittent running.
* Distributor (if applicable): While less common on this engine (it might use a distributorless ignition system), a worn distributor cap, rotor, or faulty pickup coil within the distributor could be a cause.
* Fuses and Relays: Check the fuses and relays related to the ignition system. Your owner's manual or a wiring diagram will show you which ones to check.
3. Fuel System (No Fuel):
* Fuel Pump Relay: A faulty fuel pump relay will prevent the fuel pump from turning on. Check this relay's operation and replace if necessary.
* Fuel Pump: The fuel pump itself could have failed. This is less likely to cause *both* no spark and no fuel but is worth checking once the above are ruled out. Listen for the pump's whirring sound when you turn the key to the "on" position (don't crank).
* Fuel Pump Fuse: Check the fuse protecting the fuel pump circuit.
* Inertia Switch: Some Chryslers have an inertia switch that cuts power to the fuel pump in a collision. Check to see if this switch has tripped.
* PCM (Powertrain Control Module): The PCM is the car's computer. A faulty PCM can cause numerous issues, including preventing both spark and fuel delivery. This is a more advanced diagnosis and requires specialized tools.
4. Other Considerations:
* Wiring Harness: Damaged or corroded wiring in the engine compartment can interrupt power to various components. Inspect the wiring harness for any obvious damage.
* Security System: If the car has a factory or aftermarket security system, it could be disabling the ignition system.
Troubleshooting Steps:
1. Start with the easiest and safest checks: Battery, connections, fuses, and relays.
2. Use a multimeter: Test battery voltage, check for power and ground at the fuel pump relay and ignition components.
3. Listen carefully: Listen for the fuel pump when you turn the key on.
4. Consult a repair manual: A factory service manual specific to your 1992 Chrysler New Yorker 3.8L is invaluable for detailed wiring diagrams, component locations, and diagnostic procedures.
5. Professional Diagnosis: If you're not comfortable with automotive electrical systems, consider taking your car to a qualified mechanic.
Don't attempt any repairs that you're not comfortable with. Working on automotive electrical systems can be dangerous if not done correctly. A systematic approach, starting with the basics and progressing to more complex systems, is the most effective way to diagnose this type of problem.
