how to fix engine misfire P0305 code in Ram 1500 DT (2019-Present)

Learn how to diagnose and fix P0305 cylinder 5 misfire in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts. Disconnect the battery for safety.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel pressure gauge.

2. Replace Spark Plug

• Remove the ignition coil for cylinder 5:
  • Disconnect the electrical connector.
  • Remove the mounting bolts and lift off the coil.
• Remove the spark plug:
  • Use the appropriate socket to unscrew the spark plug from cylinder 5.
• Install a new spark plug:
  • Check the gap on the new spark plug and adjust if necessary per manufacturer specifications.
  • Install the new spark plug and tighten it to the manufacturer's torque specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil appears faulty:
  • Remove the old coil as described above.
  • Install the new ignition coil, ensuring it is seated properly.
  • Reconnect the electrical connector.

4. Inspect and Replace Fuel Injector

• If the injector is suspected to be faulty:
  • Remove the intake manifold if access is limited.
  • Disconnect the fuel line and electrical connector from the injector for cylinder 5.
  • Remove and replace the fuel injector.
  • Reconnect the fuel line and electrical connector.

5. Check for Vacuum Leaks

• Inspect all vacuum lines leading to and from the intake manifold.
• Use a smoke machine or spray soapy water to identify leaks.
• Replace any damaged hoses.

6. Final Assembly

• Reassemble any components that were removed.
• Reconnect the battery.