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Engine misfiring and in limp mode

Tiny
GIB FORREST
  • MEMBER
  • 2005 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 176,000 MILES
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.
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Monday, February 22nd, 2021 AT 6:04 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 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

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Tuesday, April 6th, 2021 AT 12:14 PM

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