Miss #8 contribution code - Ford Powerstroke Diesel Forum
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Old 06-05-2013, 11:04 AM
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Miss #8 contribution code

Well lets start from the beginning I have had a contribution code in my truck for a while but recently it has begun to miss at initial startup and just missing the low end power. I have not dug in yet cause I wanna get some other options before I go throwing parts at it. First thing first the truck has become more smokey and takes a while for the charger to light off correctly. Once the charger lights it hits full boost at 28-30lbs it just doesn't pull as hard as it use to. My ficm volts are kinda questionable sometimes dipping down to 46.5 but always returning to 48.0-48.5. Ipr and calculated pressure all seem good maxing out around 3000 psi so I don't think it's a hpo leak. What I have found is as I hit the skinny pedal my fuel pressure will almost always spike the 100psi gauge doesn't seem to affect performance but doesn't seem right at all. The gauge has a brand new sending unit and is tapped right into the test port. Truck has 120000 and all mods are in sig. Anyone got anything I can check or have had similar problems that could lend some advice thanks ahead of time.


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Old 06-05-2013, 02:23 PM
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Well went out and did a few more tests cranking my ficm drops way down to 35 volts my voltage hovers around 11.5 then jumps up to 13.2. Still got the #8 contribution code after clearing but it sounds like I'm in need of a ficm.


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Old 06-05-2013, 03:18 PM
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I see hpop pressure as high as 3900 when I am in it hard ?? The smoke is most likely from lazy spool valves if the ficm voltage is low.
What do you mean by : the charger ??

Get the ficm fixed then see how it behaves IMO
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Old 06-05-2013, 03:44 PM
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The turbo is the charger lol but that 3000 psi isn't really wide open I don't really ever open her all the way up. But I'm definitely gonna order a bpd ficm and see how it acts then.


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Old 06-06-2013, 08:20 AM
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Ordered the bpd ficm 4phase should be here by Tuesday next week wasn't gonna pay the high shipping cost to overnight it.


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Old 06-06-2013, 11:51 AM
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No one has any ideas on the fuel pressure spiking only thing I'm leaning towards is a bad seal on the injector or my regulator hanging up and causing pressure to spike high.


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Old 06-06-2013, 12:59 PM
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I would lean towards the regulator hanging up on the return line. I would also take a look at the icp and ipr values at: idle/1500/2500 all at operating temp @195 degrees. The second generation hpop runs just over 4100 psi forget exact top pressure. Your miss may very well go away with a healthy ficm.
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Old 06-06-2013, 03:42 PM
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Yeah that's what I'm hoping for a healthy ficm. My ipr and icp doesn't seem like its acting up. I know at idle the calculated pressure is only 450-500 @190 operating temp sounds about normal. Never really had a problem with rough starts unless it was winter time. It would buck and carry on but that sounds like the ficm starting to fail. Guess I gotta wait till Tuesday when it comes and see how it affects it.


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  #9  
Old 06-06-2013, 04:19 PM
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I am surprised it runs at those pressures. The PCM turns on the ficm at 500 psi and normal ICP pressure at idle is 580 and 21% IPR. I lost all my figures through the different rpm's but can look them back up.
I know that the ICP pressures at upper rpm's under a load are around 3900 psi. This pressure is what puts the fuel in at the injectors. You may have a ICP that's off a bit but maybe not. I would take a close look at it and the pigtail and check for any oil coming out of it. I will look up the ICP values at the different rpm's and you can compare it to your truck.
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Old 06-06-2013, 04:33 PM
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Alright great thanks maybe this is a little further of an issue then I thought I know the ipr is at 21% at idle with the reading fluxuating anywhere from mid 400 to mid 500 I should try disconnecting the sensor and see if it the idle smooths out a bit. I wish I could go get some more reading but I'm on nights tonight so won't be able to till the morning


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