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Check engine blinking light, cylinder #3 misfire?

Tiny
BEETLEPUNK21
  • MEMBER
  • 2006 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 270,000 MILES
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!
Monday, May 1st, 2023 AT 7:59 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,967 POSTS
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.
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Monday, May 1st, 2023 AT 11:16 AM
Tiny
BEETLEPUNK21
  • MEMBER
  • 36 POSTS
Thank you! It ended up being the coil pack.
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Tuesday, May 2nd, 2023 AT 10:21 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,967 POSTS
Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Wednesday, May 3rd, 2023 AT 10:47 AM

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