bad cold starts, runs ruff for 1/2 mile. tried revx-still need help. few codes - Ford Powerstroke Diesel Forum
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Old 12-11-2011, 06:09 PM
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bad cold starts, runs ruff for 1/2 mile. tried revx-still need help. few codes

now that its getting cold i have some bad cold starts if i dont let it warm up for 15 minutes it runs ruff for 1/8 mile or a 1/2 mile. i tried revx and an oil change about 60 miles ago and i still need help to get this thing strait. i have a 2005 f350 that i bought about 7000 miles ago it has about 148000 on it right now. motor is stock

so far i have
cleaned the egr (it was dry in there when i pulled it out, no antifreeze or oil on it)

I did an oil change and added revx about 60 miles ago.

fuel and air filter was changed 7000 miles ago

i just ordered a block heater cord (10 minutes ago) it must have never had one?

here are the codes it has right now (there is no check engine light on but still showed these codes)

p0263
p0272
p0281
p0528

from what i was told ( and I dont know what any of this means)
p0263 is cyl 1 contribution 1 balance fault
p0272 is cyl 4
p0281 is cyl 7
p0528 is speed sensor circuit no signal

i plan on buying a SCT so i can see some other things but what else do i need to do to fix this thing?

Thanks for any help
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Old 12-11-2011, 07:21 PM
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Check your FICM voltage. Should Never be less than 46 volts
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Old 12-11-2011, 07:24 PM
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Probably dropping voltage causing issue.
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Old 12-12-2011, 02:57 AM
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ok thanks. is this the right way to do it?


***FICM voltage tests should be performed with the engine oil COLD (ie, close to ambient air temperature). This will force the FICM into it's inductive heating strategy, which will give you a worse case scenario/voltage reading. If the engine has been run (within 5-6 hours of this test), then the warm engine oil may not give you an accurate FICM voltage.

On all 2003-2007 Ford 6.0L Power Stroke diesel engines you will find the FICM bolted to the drivers side valve cover...you may need to unbolt the coolant reservoir from the 'cowl' so that you can get your arms/hands back there to work on the FICM.

You don't need to drain the coolant...just unbolt the bracket that hold the coolant reservoir, and gently move it as far out of your way as possible. Be careful, as there is a plastic coolant connector that can be cracked if the coolant jug is handled forcefully.

On the top of the FICM, you will see a diamond/oval shaped metal plate...remove the two screws from that plate (Torx#20).

under that plate you will either see 7 "lugs"...or 4 "lugs" (depending on the year of the truck)...

if you have a "7 lug FICM"...you want to put one lead from your multimeter onto the upper left "lug"...and the other multimeter probe to ground (bare spot on the cylinder head, alternator bracket, negative battery terminal, etc).

If you have a "4 lug FICM"...you will want to check the lug on the right (closest to the drivers side fender).

be careful NOT to lean the probe on the FICM lug...over onto the aluminum case...you might let the smoke out, LOL...

Have someone turn the key to the 'on' position (don't crank it yet)...and see what your FICM voltage is. It should be >46volts.

Next have someone crank the engine...and see what the FICM voltage is while cranking...again..should be >46volts.

Go ahead and start the engine...and see what the voltage is while idling.

If the FICM voltage drops below 46 volts...then it is "bad"...

we have seen FICM's as low as 17volts...some 19v's...some in the twenty's and low thirties...

obviously...the lower the voltage...the 'worse' the FICM is...and the more likely that (cold) rough running would be a result of a bad FICM.

however..if you email (or call) us and say that your FICM is dropping to 43-44volts...while low..I think that you may have some underlying injector issues that may be contributing to your cold rough running, as much as the slightly low voltage FICM

however, if your voltage IS low...then your FICM is bad, and you can place an order at the following link.
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Old 12-12-2011, 08:20 AM
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Old 12-12-2011, 08:24 AM
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if your ficm voltage does test good and all looks ok there , the chance of having injector issue even with the revex is possible
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