Rough Idle or Engine Misfire

Expert diagnosis and repair solutions for 2005 nissan altima Rough Idle or Engine Misfire. Get step-by-step fixes, cost estimates, and professional advice.

Expert Repair Solutions

medium$100-$200

Replace faulty spark plugs and ignition coils to resolve misfire issues.

Source: https://www.nissanclub.com/threads/2005-2-5-nissan-altima-constant-misfires.399498/

Repair Steps:

Identify the misfiring cylinder using an OBD-II scanner.
Remove the ignition coil and spark plug from the affected cylinder.
Inspect the spark plug for wear or oil contamination and replace if necessary.
Install a new ignition coil if the old one is faulty.
Reassemble and test the engine for smooth operation.

medium$150-$250

Address oil contamination in spark plug wells by replacing the valve cover gasket.

Source: https://www.youtube.com/watch?v=TwvM3wG_kZk

Repair Steps:

Remove the valve cover to access the spark plug wells.
Inspect the gasket for damage or wear.
Replace the valve cover gasket to prevent oil leakage.
Clean any oil residue from the spark plug wells.
Reinstall the valve cover and test for leaks.

easy$20-$100

Clean or replace the mass airflow sensor to resolve rough idle issues.

Source: https://www.justanswer.com/nissan/b8ytz-2005-nissan-altima-2-5sl-idling-really-rough-when.html

Repair Steps:

Locate the mass airflow sensor in the air intake system.
Disconnect the sensor and remove it from the vehicle.
Use a mass airflow sensor cleaner to clean the sensor element.
Reinstall the sensor and reconnect it.
Start the engine and verify that the idle is stable.

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