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2008 Ford F-150 5.4L Triton

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Old 11-18-2015, 06:17 PM
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Default 2008 Ford F-150 5.4L Triton misfiring
I have misfire codes on cylinders 4&8. Replaced all 8 spark plugs after getting bad gas and coil pack on #4. Today we replaced both Catalytic converters and O2 sensors. Still showing misfire codes and it's definitely missing. Don't know if the boot was replaced on #4. Any suggestions?
Last edited by Marie Womack; 11-18-2015 at 07:14 PM. Reason: Wanting to change title
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Old 11-18-2015, 07:37 PM
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Check the coils, check the plugs for gap, check the fuel injectors.
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Old 11-18-2015, 09:04 PM
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Originally Posted by Marie Womack
I have misfire codes on cylinders 4&8. Replaced all 8 spark plugs after getting bad gas and coil pack on #4. Today we replaced both Catalytic converters and O2 sensors. Still showing misfire codes and it's definitely missing. Don't know if the boot was replaced on #4. Any suggestions?
Swap the coils and see if the missfire follows, take 2 good coils swap them to 4&8
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