how to troubleshoot Ram 1500 DT (2019-Present) with a misfire code P0302?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the battery (negative terminal) to prevent electrical shock.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, anti-seize compound.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil using a socket set.
• Inspect the spark plug for wear or damage, and replace if necessary.
  • Torque new spark plug to manufacturer specifications (typically around 13-20 lb-ft).
• Install the new ignition coil and reconnect the connector.

3. Inspect and Replace Fuel Injector

• Tools Required: Fuel line disconnect tool, socket set.
• Ensure the fuel system is depressurized (refer to the service manual for specific instructions).
• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel rail bolts and carefully lift the rail to access the injector.
• Remove the faulty injector and install a new one, ensuring proper alignment.
• Reinstall the fuel rail and reconnect all components.

4. Check and Repair Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Inspect all vacuum lines connected to the intake manifold and cylinder 2.
• Use a smoke machine to detect leaks or spray carburetor cleaner around suspected areas to identify leaks (engine idle should change).
• Replace any damaged vacuum hoses.

5. Compression Test (if needed)

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2.
• Install the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare it to the manufacturer’s specifications; replace the engine if compression is low.