Rough Idle and Driving when cold?? - Ford Powerstroke Diesel Forum
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Old 02-13-2012, 02:08 PM
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Question Rough Idle and Driving when cold??

Okay there are a few problems that i have been dealing with lately. When I start the truck up cold it chops really bad, it sounds like it has a serious cam in it. Then when i put it in drive it has no power really and shifts pretty hard. Every once in a while it wont start on the first try. After I get up to speed around 50-60 the truck starts shaking and jumping pretty bad, its hard to explain. It almost feels like a mild wheel hop if that makes any sense. But after it warms fully up it drives pretty much perfect. Iv been dealing with this for awhile but now and I dont know if these problems are related. I just need to figure out whats going on with it. Maybe yall can point me in the right direction. Thanks!
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Old 02-14-2012, 04:05 PM
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not sure if we have the same problem but is it programmed? if so put it back on stock and see if its any better
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Old 02-15-2012, 04:55 PM
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I had the same problem. Turned out that the FICM (fuel injection control module) was bad. I have an 06 F350 dually, purchased new. Now I have 70,000 miles on it. I am on my third alternator and third battery nearest the alternator. The alternator & battery failing sent low voltage to the FICM which ended up damaging it. The FICM should be drawing around 47 volts, mine was drawing only 32 volts.
Hopefully this might give you something to check.
Good luck.
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Old 02-16-2012, 09:37 AM
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I had it programmed at 150hp then I dropped it down to 50hp tow tune and that helped a little. But how do I check the voltage comming thought the ficm? I'm thinking that's the problem also. Anouther thing I forgot to add is that when I am at a traffic light after the trucks warmed up the truck feels like it is giving it's self gas and it wants to accelerate, the rpms drop because I have to hold the brake then it stops, like a surge. It will only do that for about 2 seconds and it doesn't happen all the time. Is this anouther symptom of a bad ficm. Thanks again!
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Old 02-16-2012, 05:41 PM
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For checking the FICM's voltage run a search in the 6.0 forum. The FICM is under the degas container. Move it out of the way and there is a small access panel on the top of the FICM. There are good descriptions of testing the voltage in the access panel;
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Old 02-17-2012, 01:44 PM
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mine is doing the SAMMMEE thing what do i do to fix it?
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Old 02-18-2012, 08:56 AM
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I just fixed an 03 with the same problem. Ran real bad and shifts hard when cold. The problem with it was a few bad injectors. I graphed the injectors through a cylinder contribution test which showed me that 3 injectors where bad when cold. If your FICM voltage is correct, injectors is where I would look to next.
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Old 02-18-2012, 09:02 AM
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The surging at idle on mine was from a clogged Egr valve... Everything else sounds like either a bad ficm or bad injectors


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Old 03-05-2012, 10:16 AM
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Alright I check the ficm, voltage is good. I cleaned the egr valve yesterday, it was horrible. But it is going to get studded tomorrow so ill see how it is after I get the truck back and go from there. Thanks for the input!
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