how to repair Ram 1500 DT (2019-Present) with P0300 random misfire code

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, multimeter, compression tester.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery before starting work on the ignition system.

2. Inspect and Replace Spark Plugs

• Remove the engine cover if necessary.
• Disconnect the ignition coil connectors and remove the coils.
• Unscrew the spark plugs using a spark plug socket and inspect for wear or fouling.
• Replace with new spark plugs (manufacturer-recommended specifications).
• Reinstall the ignition coils and reconnect the connectors.

3. Check and Replace Ignition Coils

• If any coils appear damaged or worn, replace them one at a time.
• Remove the faulty ignition coil by unscrewing it from the engine.
• Install the new ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injectors

• Check the fuel injectors for proper operation and any signs of leakage.
• If faulty, remove the fuel rail to access the injectors.
• Replace any malfunctioning fuel injectors, ensuring proper seating and alignment.
• Reassemble the fuel rail and reconnect any fuel lines.

5. Vacuum System Inspection

• Visually inspect all vacuum hoses for cracks, breaks, or disconnections.
• Use a smoke machine or carburetor cleaner to check for leaks.
• Replace any damaged hoses to ensure proper engine performance.

6. Compression Test

• Remove the spark plugs to allow easy access to the cylinders.
• Insert the compression tester into each cylinder and crank the engine.
• Record the compression readings for each cylinder; if low, investigate further for potential internal engine issues.