Rough idle and code p0678 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 12-19-2015, 09:49 PM Thread Starter
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Rough idle and code p0678

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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post #2 of 2 (permalink) Old 01-01-2016, 03:45 PM
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Yes, need ficm output readings first, should be 47-49v if healthy.

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

Harry

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
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