Rough Idle or Engine Misfire

Expert diagnosis and repair solutions for 2012 nissan altima Rough Idle or Engine Misfire. Get step-by-step fixes, cost estimates, and professional advice.

Expert Repair Solutions

medium$150-$300

Replace faulty ignition coils to resolve engine misfire issues.

Source: https://repairpal.com/nissan/altima/2012/rough-idle

Repair Steps:

Purchase new ignition coils compatible with the 2012 Nissan Altima.
Disconnect the battery to ensure safety.
Remove the engine cover to access the ignition coils.
Unplug the electrical connectors from the ignition coils.
Remove the bolts securing the ignition coils and replace them with new ones.
Reconnect the electrical connectors and reattach the engine cover.

easy$10-$20

Clean the mass airflow sensor to improve idle stability.

Source: https://www.reddit.com/r/mechanic/comments/19a7a3w/nissan_altima_2012_25l_rough_idle/

Repair Steps:

Purchase a mass airflow sensor cleaner from an auto parts store.
Locate the mass airflow sensor near the air filter housing.
Disconnect the sensor from the air intake system.
Spray the sensor with the cleaner, ensuring all debris is removed.
Allow the sensor to dry completely before reinstalling it.
Reconnect the sensor and test the vehicle for improved idle.

medium$50-$150

Inspect and repair vacuum leaks that may cause rough idling.

Source: https://www.altimaforums.net/threads/rough-idle-in-drive-or-reverse.55940/

Repair Steps:

Visually inspect vacuum hoses for cracks or disconnections.
Use a smoke machine to detect leaks if visual inspection is inconclusive.
Replace any damaged vacuum hoses.
Ensure all connections are secure and test the vehicle for idle improvement.

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