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Junior Member
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62 Posts
Discussion Starter #1
I got a f-250 2004 that become having a rough idle... Weird because is kind of shaking while idle but in addition a code appears on my scan gauge II... P0678

Is my understanding that this code indicates that something wrong with glow plug.. But truck is not having any problem starting engine... And about the rough idle.. I think one of the reasons could be low voltage ficm
But i have not check that yet..

Any clues??? Please guys!!
 

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Senior Member
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3,051 Posts
Yes, need ficm output readings first, should be 47-49v if healthy.

Faulty injector is also a strong possibility if ficm is ok.

Harry
 
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