how to fix P0301 misfire code in my Ram 1500 DT (2019-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shock.
• Ensure the engine is cool before beginning any work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  1. Unplug the electrical connector.
  2. Remove the mounting bolts using a socket set.
  3. Pull the coil out gently.
• Remove the spark plug:
  1. Use a spark plug socket to unscrew and remove the old spark plug.
• Inspect the spark plug for wear or fouling.
• Install a new spark plug:
  1. Apply anti-seize compound to the threads (optional).
  2. Torque the spark plug to manufacturer specifications (typically 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is not the issue, check the ignition coil:
  1. Test the ignition coil with a multimeter for resistance as per specifications.
  2. If faulty, replace the ignition coil by reversing the removal steps.

4. Check and Clean Fuel Injector

• Test the fuel injector operation:
  1. Use a noid light to check for signal; if no signal, check wiring.
  2. If the injector is clogged, remove it and clean with an appropriate fuel injector cleaner.
• Reinstall the injector or replace it if necessary.

5. Perform a Compression Test

• Connect a compression gauge to the spark plug hole of cylinder 1.
• Crank the engine and record the compression reading.
• If compression is low, further investigation is needed for potential valve or piston issues.

6. Inspect for Vacuum Leaks

• With the engine running, use a smoke machine or carburetor cleaner to check for vacuum leaks around the intake manifold and associated hoses.
• Repair any leaks found.