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2021
nissan altima4 views

Rough Idle or Engine Misfire

Expert diagnosis and repair solutions for 2021 nissan altima Rough Idle or Engine Misfire. Get step-by-step fixes, cost estimates, and professional advice.

Expert Repair Solutions

1
medium$100-$300
Inspect and replace faulty spark plugs and ignition coils.
Source: https://repairpal.com/nissan/altima/2021/rough-idle

Repair Steps:

  1. Inspect the spark plugs for wear or damage.
  2. Replace any faulty spark plugs with new ones.
  3. Check the ignition coils for proper function.
  4. Replace any faulty ignition coils.
2
medium$50-$150
Check for and repair any vacuum leaks in the intake system.
Source: https://www.altimaforums.net/threads/misfire.56391/

Repair Steps:

  1. Attach a vacuum gauge to a full vacuum source to check for leaks.
  2. Identify any leaks in the intake system.
  3. Seal or replace any leaking components.
3
medium$80-$200
Clean the throttle body and intake valves to remove carbon build-up.
Source: https://www.altimaforums.net/threads/rough-idle-in-drive-or-reverse.55940/

Repair Steps:

  1. Remove the throttle body from the engine.
  2. Use a throttle body cleaner to remove carbon deposits.
  3. Clean the intake valves with an appropriate cleaner.
  4. Reinstall the throttle body and test for improvement.
4
medium$150-$250
Replace the mass air flow sensor if faulty.
Source: https://www.youtube.com/watch?v=QbfHpTAyz7o

Repair Steps:

  1. Unplug the mass air flow sensor.
  2. Remove the faulty sensor from the air intake system.
  3. Install a new mass air flow sensor.
  4. Reconnect the sensor and test the vehicle.

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