my Ram 1500 DT (2019-Present) has engine misfires, how can I diagnose it?

Learn how to diagnose and fix engine misfires in Ram 1500 DT (2019-Present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shock.

2. Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket and ratchet to remove the old spark plugs.
• Inspect the old plugs for signs of wear and compare with specifications.
• Install new spark plugs, tightening them to the manufacturer’s specified torque (typically around 15 ft-lbs).
• Reconnect the ignition coils on each spark plug.

3. Inspect and Replace Ignition Coils (if needed)

• If misfire codes indicate a specific cylinder, remove the ignition coil from that cylinder.
• Test the coil with a multimeter to ensure it meets the specifications (usually between 0.5 to 1.5 ohms).
• Replace any faulty ignition coils with new ones, ensuring they are seated correctly.

4. Fuel System Check

• Connect a fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the ON position (do not start) and check the pressure.
• Ensure the pressure is within the manufacturer's recommended range (usually between 50-60 psi).
• If pressure is low, inspect the fuel pump and fuel filter for blockages; replace as necessary.

5. Air Intake Inspection

• Remove the air intake duct to access the throttle body.
• Inspect for any debris, blockages, or vacuum leaks.
• Clean the throttle body using an appropriate cleaner if deposits are present.
• Reattach the air intake duct securely.