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2020
ford f-15026 views

Rough Idle or Engine Misfire

Expert diagnosis and repair solutions for 2020 Ford F-150 Rough Idle or Engine Misfire. Get step-by-step fixes, cost estimates, and professional advice.

Expert Repair Solutions

1
medium$150-$300
Replace the spark plugs and ignition coils to address misfire and rough idle issues.
Source: https://www.f150ecoboost.net/threads/2020-3-5-ecoboost-rough-idle-solved.87595/

Repair Steps:

  1. Purchase new spark plugs and ignition coils.
  2. Remove the engine cover to access the ignition coils.
  3. Disconnect the electrical connectors from the ignition coils.
  4. Remove the old spark plugs and ignition coils.
  5. Install the new spark plugs and ignition coils.
  6. Reconnect the electrical connectors and replace the engine cover.
2
easy$20-$50
Clean the throttle body and mass airflow sensor to improve idle quality.
Source: https://www.youtube.com/watch?v=kJtattyUKJ4

Repair Steps:

  1. Purchase a throttle body cleaner and mass airflow sensor cleaner.
  2. Remove the air intake hose to access the throttle body.
  3. Spray the throttle body cleaner onto the throttle plate and surrounding area.
  4. Use a clean cloth to wipe away any carbon deposits.
  5. Remove the mass airflow sensor and spray it with the sensor cleaner.
  6. Reinstall the mass airflow sensor and air intake hose.
3
hard$100-$200
Perform a vacuum leak test and repair any identified leaks.
Source: https://repairpal.com/ford/f-150/2020/rough-idle

Repair Steps:

  1. Use a smoke machine to introduce smoke into the intake system.
  2. Inspect the engine bay for any visible smoke leaks.
  3. Identify the source of the leak, such as a cracked hose or gasket.
  4. Replace or repair the faulty component.
  5. Re-test the system to ensure no further leaks are present.
4
medium$100-$200
Reprogram the Powertrain Control Module (PCM) to address misfire issues.
Source: https://static.nhtsa.gov/odi/tsbs/2019/MC-10169890-0001.pdf

Repair Steps:

  1. Connect a diagnostic scan tool to the vehicle's OBD-II port.
  2. Access the PCM reprogramming menu on the scan tool.
  3. Download the latest PCM software update from the manufacturer's website.
  4. Follow the scan tool instructions to upload the new software to the PCM.
  5. Verify that the update resolves the misfire issue.
5
hard$200-$400
Inspect and replace the VCT solenoids to address rough idle and misfire.
Source: https://www.youtube.com/watch?v=KZcb4pvk8Iw

Repair Steps:

  1. Locate the VCT solenoids on the engine.
  2. Disconnect the electrical connectors from the solenoids.
  3. Remove the solenoids using the appropriate tools.
  4. Install the new VCT solenoids and reconnect the electrical connectors.
  5. Test the engine to ensure the rough idle and misfire are resolved.

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