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Discussion Starter · #1 ·
My 05 f250 6.0 with 147000 miles has randomly has a rough idle at start. Ficm voltage occasionally drops to 48 logic power is the same. I'm seeing 11.50 on ficm ignition voltage and battery's when I'm getting rough idle. Checked battery's and ones at 12.8 v and the others at 12.7v. If I turn truck off and let glow plugs warm again rough idle goes away.
I don't want to start throwing parts on a whim as I have no dtc and haven't found any one with the same issue just similar ones. Any one gone through this before? Or any ideas on how to fix it
 

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I would have the batteries load tested and check your alternator output. Voltage and amps. You may have a bad battery or weak alternator.
 

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Discussion Starter · #3 ·
I hope it's not the alt I just replaced the end of last month lol, I'll have to take my battery's in to get them load tested thanks for the advice
 
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