Rough Idle or Engine Misfire

Expert diagnosis and repair solutions for 2009 Ford F-150 Rough Idle or Engine Misfire. Get step-by-step fixes, cost estimates, and professional advice.

Expert Repair Solutions

medium$200-$400

Inspect and replace the intake manifold gasket to address vacuum leaks.

Source: https://www.justanswer.com/ford/kkun0-rough-idle-major-power-loss-misfiring-crazy-not.html

Repair Steps:

Inspect the intake manifold for visible signs of gasket wear or vacuum leaks.
Remove the intake manifold carefully, ensuring no debris falls into the engine.
Replace the old gasket with a new one, ensuring proper alignment and seal.
Reinstall the intake manifold and check for leaks after starting the engine.

medium$300-$600

Replace the VCT solenoids to resolve misfire issues.

Source: https://www.f150forum.com/f38/2009-f-150-5-4-rough-idle-check-engine-missing-under-load-344549/

Repair Steps:

Locate the VCT solenoids on the engine.
Disconnect the electrical connectors and remove the solenoids.
Install new VCT solenoids and reconnect the electrical connectors.
Test the engine to ensure the misfire issue is resolved.

hard$800-$1500

Check and replace clogged catalytic converters if necessary.

Source: https://www.youtube.com/watch?v=vE9sCZLaKko

Repair Steps:

Perform a backpressure test to confirm catalytic converter blockage.
If clogged, remove the catalytic converters from the exhaust system.
Install new catalytic converters, ensuring proper fit and alignment.
Test the vehicle to ensure improved engine performance and no misfires.

easy$150-$300

Perform a full tune-up including spark plugs and coil replacements.

Source: https://www.reddit.com/r/AskMechanics/comments/18fp9fa/09_ford_f150_misfire_issue/

Repair Steps:

Remove old spark plugs and ignition coils from the engine.
Install new spark plugs and ignition coils, ensuring proper torque.
Check engine performance and ensure no further misfire codes are present.

Get a Personalized Diagnosis

Get AI-powered repair suggestions specific to your vehicle's symptoms and history.

Start Free Diagnosis →

Browse more common problems