6.0L rough start/idle until warm - Ford Powerstroke Diesel Forum
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Old 07-17-2010, 04:54 PM
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6.0L rough start/idle until warm

Our '06 F450 6.0L has been starting pretty rough lately. If you try to drive it before the engine/trans temps are warm, it runs super rough and spits a little smoke. Oil changes have been at 7,500 mi. like my dealer said but I saw somewhere that a lot of people change at 5K mi. Once the engine/trans are at normal temps, it runs perfectly fine. We haven't done a fuel/water separator/filter change in a while, could this be it?
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Old 07-17-2010, 05:17 PM
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Could be a problem with your FICM. Check the voltage while having it cranked over. If it falls below 45v or so you either need to pull it and resolder the connections or send it to Swamps and have it beefed up to 58v. You could also put a stock replacement FICM back in. It could also be injector stiction but I would rule out the FICM first.
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Old 07-18-2010, 09:53 AM

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Not many on here like going 7,500 on an oil change. That could be what has lead to you problem. Many also change the fuel filter at 10,000 also. You can do a search on cold start issues and find many things. I know from personal experience and many others that Rev-X will Help the cold issues. If the truck runs good after it is warmed up, then the Rev-X will fix the cold issues. One other thing is many have found that the 6.0 runs better on synthetic oils. Everyone will have suggestions as to what oil and weight.
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