Today, we’re addressing a misfire issue on a 2010 Ford F-150 with a 5.4-liter engine. The owner complained about the check engine light coming on and experiencing hesitation. Upon pulling the fault code, it indicated a misfire on cylinder number 8.
Upon inspection, it was discovered that the cylinder had accumulated water, likely due to the truck sitting idle amidst rainy weather and debris buildup. The water was blown out of the cylinder, and the coil was checked before reassembly to rectify the misfire.
After clearing the water and ensuring the functionality of the coil, a road test was conducted. However, the check engine light persisted, indicating an ongoing misfire on cylinder number eight. As a result, the spark plug and possibly the coil needed replacement.
During the examination, it was observed that the plug exhibited an unusually large gap, leading to the decision to replace it. The new plug, with the appropriate gap, was installed alongside a new coil due to potential water damage. This should effectively address the misfire problem.
All the plugs were replaced with ease, and extra precautions were taken due to the engine’s aluminum heads. Additionally, the rear coil was replaced, and meticulous attention was given to ensuring a proper fit to prevent any future water leakage issues into the cylinder.
Following the replacements and necessary maintenance, the engine was running smoothly, indicating a successful resolution to the initial misfire problem.
Thank you for watching how we remedied the misfire issue on this Ford F-150. Your support is appreciated!
What was the issue with the 2010 Ford f-150 5.4 liter engine?
The issue reported was the check engine light coming on and hesitation, which was diagnosed as a misfire on cylinder number 8.
How was the issue resolved?
The mechanic found that cylinder number 8 was full of water, likely due to the truck sitting for a while with leaves underneath. The water was blown out, and a new plug and coil were installed, which resolved the misfiring problem.
What was the gap issue with the plug?
The plug’s gap was found to be twice as big as it should have been, which was addressed by installing a new set of plugs with the correct gap.