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Old 06-20-2012, 12:06 PM
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Runnin rough need some assistance

Hello, Started running rough today (like a gas motor not firing on a cylinder) and there is alot of black smoke if I put my foot into it.

Im thinking injector.

What are your thoughts and what is your guidance?

Thank you
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Old 06-20-2012, 12:59 PM
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Has it thrown any codes? Also what are you FICM voltages?
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Old 06-20-2012, 01:05 PM
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Just checked it at Schucks with their OBD and there are no codes at all. How do I check voltage at the FCM?
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Old 06-20-2012, 01:35 PM
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Quote:
Originally Posted by 6.0DJ View Post
Just checked it at Schucks with their OBD and there are no codes at all. How do I check voltage at the FCM?
To read FICM volts, either a monitor scan tool OR you can use a multimeter. Even with good readings, the FICM can still be bad/weak.

http://www.swampsdiesel.com/site/how...oltageTest.pdf
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Old 06-20-2012, 01:40 PM
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The rough running "comes and goes" but it blows black smoke all the time.
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Old 06-20-2012, 02:04 PM
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Have you checked your CAC boots for cracks/holes. Also check the flex joints on the up-pipe and y-pipe. You can also check for IC damage, and if you have the plastic CAC piping on the cold side.
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Old 06-20-2012, 02:31 PM
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I need to let it cool off and check my voltage tomorrow; I just gave the guy down the street a jump start and it didnt want to start. I am betting on the FICM.
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Old 06-20-2012, 02:38 PM
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Weak Batteries can cause issues also. It's best to be sure your batteries are working correctly before testing FICM.
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Old 06-21-2012, 03:26 PM
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Ok I did the voltage test and i have 48 on the key and 48 running. So I pulled the EGR while I was in the neighborhood and cleaned it. The truck runs alot better but it is still blowing black smoke and a lot of it. Your thoughts please.
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Old 06-21-2012, 03:27 PM
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And still no codes.
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