Engine misfiring and in limp mode

2005 FORD F-150
176,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
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GIB FORREST
  • MEMBER
  • 1 POST
I was driving home one day and just started missing and went into limp mode cylinder 3 was the code. I have changed all the plugs and coils and it still misfires in cylinder 3 and 1 I have switched coils and plugs around and it doesn’t follow it it stays on 3 and 1.
Feb 22, 2021 at 10:04 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

The next thing I would check would be compression and the fuel injector for cyl 3. It may be stuck or not operating. Also, low compression will cause a misfire as well.

Here are a couple of links to help. The first explains how to check an injector.

https://www.2carpros.com/articles/how-to-test-a-fuel-inje

When checking the injector, make sure it is getting a pulse (power) to fire.

Here is a link showing how to check engine compression:

https://www.2carpros.com/articles/how-to-test-engine-compression

_______________________________

Try these things and let me know the results. Also, let me know if you have other questions.

Take care and God Bless.

Joe

Apr 6, 2021 at 5:14 AM
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