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96GMC6.5L 07-25-2009, 10:36 PM My buddy has a 6 liter that runs wicked rough when cold (not as in cold outside but cold engine), but is fine once it gets up to temp. A shop told him it was his injectors and gave him a cleaner and said that if that didn't work they could flush all the injectors and try that. What do you guys think Thanks woodchuck2 07-25-2009, 11:10 PM I would start by cleaning the air intake plenum and the IAC. Probably all gummed up. f250powerhouse 07-26-2009, 10:44 PM It could be injector spool valves, there is a new flash from Ford that could possibly fix the problem. Black Stallion 07-27-2009, 12:13 AM What year and how many miles? HEUI's are notorious for letting ya know when injectors are starting to die. Tom 96GMC6.5L 07-27-2009, 07:43 AM It could be injector spool valves, there is a new flash from Ford that could possibly fix the problem. I think this is the culprit. I searched online a bit and came up with this. It has all the symptoms. It is an 05 with like 170,000. Black Stallion 07-31-2009, 08:18 PM I think this is the culprit. I searched online a bit and came up with this. It has all the symptoms. It is an 05 with like 170,000. With 170K on the odo, its more likely a few injectors. Do a cyl contrib test when its running. Tom brownd 07-31-2009, 09:15 PM With a fleet of 6.0L's I can't count our injectors. We have two trucks that have to be plugged in year-round, due to the rough idle. Two dealers with the same result. Replace injectors and keep it plugged in! Great design... f250powerhouse 08-01-2009, 12:22 PM 05-07 6.0's do not have problematic injectors. But if they do go out, blue smoke and a rough idle when warmed up is the givaway. | ||