5.4 misfire. any ideas?

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Sep 6, 2014 | 06:08 PM

#16

jethat

Senior Member

Joined: Jun 2007

Posts: 5,522

Likes: 6

From: Utah

Quote:

Originally Posted by mtbost777Jesus7

The wires are about a year old the misfire is worse when in gear and as the engine gets hotter. What I really want to know is if the computer is a possibility cause the old engine I replaced misfired on the same #4 cylinder.

I listed the causes for a missfire. I've never heard of a pcm causing a single cylinder miss..
You have a bad wire,plug,coil,injector or your compression has fallen to unworkable levels.