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2012
toyota corolla6 views

Rough Idle or Engine Misfire

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

Expert Repair Solutions

1
medium$150-$300
Replace faulty ignition coils and spark plugs to address misfire and rough idle.
Source: https://www.toyotanation.com/threads/rough-idle-and-multiple-misfires.1647076/

Repair Steps:

  1. Identify the faulty ignition coil(s) using a diagnostic tool.
  2. Purchase replacement ignition coils and spark plugs.
  3. Remove the engine cover to access the ignition coils.
  4. Disconnect the electrical connectors and remove the faulty ignition coils.
  5. Install the new ignition coils and reconnect the electrical connectors.
  6. Replace the spark plugs with new ones.
  7. Reattach the engine cover and test the vehicle for improvement.
2
easy$20-$50
Inspect and replace any cracked or brittle vacuum hoses to fix vacuum leaks.
Source: https://www.facebook.com/groups/711938429853649/posts/1433389087708576/

Repair Steps:

  1. Visually inspect all vacuum hoses for cracks or signs of wear.
  2. Use a smoke machine to identify any hidden leaks.
  3. Purchase replacement hoses if necessary.
  4. Remove the damaged hoses and install new ones.
  5. Ensure all connections are secure and test for leaks.
3
medium$100-$200
Clean or replace dirty fuel injectors to improve idle quality.
Source: https://www.facebook.com/groups/711938429853649/posts/1433389087708576/

Repair Steps:

  1. Add a fuel injector cleaner additive to the fuel tank.
  2. Drive the vehicle for a few hundred miles to allow the cleaner to work.
  3. If the problem persists, remove the fuel injectors for manual cleaning or replacement.
  4. Reinstall the cleaned or new injectors and test the vehicle.
4
hard$200-$400
Check and replace the intake manifold gasket if it's leaking.
Source: https://www.toyotanation.com/threads/2003-corolla-running-rough-and-misfiring-really-need-your-help-madison-wi.395121/

Repair Steps:

  1. Perform a visual inspection for signs of a leaking gasket.
  2. Remove the intake manifold to access the gasket.
  3. Clean the gasket surface and remove the old gasket.
  4. Install a new intake manifold gasket.
  5. Reassemble the intake manifold and check for leaks.

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