how to diagnose misfire issues on Ram 1500 DT (2019-Present)

Learn how to diagnose and fix engine misfire issues on Ram 1500 DT (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is on a level surface and parked securely.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench, gap gauge
• Remove the ignition coil by unbolting it and disconnecting the electrical connector.
• Using a spark plug socket, remove the old spark plug.
• Check the gap on the new spark plug using a gap gauge; set it to the manufacturer's specifications.
• Install the new spark plug, hand-tighten, and then torque it to the manufacturer's specification (usually around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coils (if necessary)

• Tools Required: Multimeter, socket set
• Disconnect the ignition coil connector and remove the coil.
• Use a multimeter to test the coil's resistance; compare with specifications in the service manual.
• If the coil is faulty, replace it with a new unit, ensuring proper fit and securing the connector.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors
• If using a cleaning kit, follow the manufacturer's instructions to clean the injectors.
• If replacing, disconnect the fuel lines, remove the old injectors, and install new ones, ensuring O-rings are lubricated and seated correctly.

5. Verify Air Intake System

• Tools Required: Basic hand tools
• Inspect the air intake hose for cracks or leaks; replace if necessary.
• Check the throttle body for carbon buildup and clean it if needed.