Check engine blinking light, cylinder #3 misfire?

2006 FORD EXPEDITION
270,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
Avatar
BEETLEPUNK21
  • MEMBER
  • 126 POSTS
Hello,

I get a check engine blinking light (cylinder #3 misfire) when accelerating hard. Vehicle starts and runs fine. It only seems to happen when accelerating hard. What would be the process for diagnosing this issue? Thank you!
May 1, 2023 at 7:59 AM
Advertisement
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
This is common when the spark plugs or ignition coil is going out, I would replace them both.

Here is a video of the job being done so you can fix your truck:

https://youtu.be/E6oier7agkY

This guide may help as well:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
May 1, 2023 at 11:16 AM
Avatar
BEETLEPUNK21
  • MEMBER
  • 126 POSTS
Thank you! It ended up being the coil pack.
May 2, 2023 at 10:21 AM
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Thanks for letting us know, we are here to help, please use 2CarPros anytime.
May 3, 2023 at 10:47 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.