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Old 04-07-2013, 02:33 PM
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Question PO281 code after head stud install

I just completed a cab off head stud install on my 2005 f350, fired it up for the first time yesterday. After a long crank it fired up and was idling like a brand new truck. While i had it all apart i cleaned the spool valves as i had some stiction before taking it apart. I let it warm up just idling, and after about 5 minutes it dropped a cylinder, so i scanned it and came up with 9 codes.

po261
po264
po267
po270
po273
po276
po279
po281
po282

I figured i had a connection issue with the ficm, so i wiggled the connections, cleared the codes and refired it. Once again it ran like new for about 3 minutes then dropped a cylinder, checked codes and only po281 remains. I'm guessing it's a ficm harness issue, but is it possible it's an injector? BTW, ficm voltage is 48-49, shows it's synced, and icp is good.
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Old 04-07-2013, 03:39 PM
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Check the ground connector from the FICM that connects to the intake manifold.
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Old 04-07-2013, 03:49 PM
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Ground on the back of the intake is tight, just checked it.
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Old 04-07-2013, 06:02 PM
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I also unplugged cylinder 7's injector and made sure it was connected properly, after i did that i started the truck and it ran perfectly at idle, no misfire, until i touched the throttle, at which point it began missing again. Subsequent attempts to wiggle the wiring at injector 7 have been fruitless, it still misses.
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Old 04-07-2013, 07:07 PM
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Whats the IPR and ICP readings at idle? Does the IPR start around 35 and rise to 85 as it runs?
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Old 04-07-2013, 07:11 PM
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Ipr is around 25-27 at idle, icp is 580-600 at idle. I didn't pay attention to IPR percentage, but icp was as high as 3700 in the short drive i took.
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Old 04-07-2013, 07:40 PM
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IPR is good at idle, ICP looks good also. I don't think were looking at a HPO issue. Lets check FLP and FVP on the FICM.
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Old 04-08-2013, 09:38 AM
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Ficm logic and vehicle are both 12-12.5, I came out and fired the truck up today and it's on all 8 when it's cold. I'm leaning towards this being something to do with the harness. Is there anything else that would be affected by heat?
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Old 04-11-2013, 06:57 PM
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Put in the new harness today, fired it up and ran perfect, until.... It reaches around 130 ECT and drops cylinder number 7. Still have the code PO281, it looks like i need an injector? Or is it possible it's just injector o-rings?
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Old 04-12-2013, 05:57 AM
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It could be a high pressure leak at that injector, if it was on the fuel side of the injector, it would be smoking pretty bad. Injector o-rings aren't that hard, the one on the top where the high oil is, is the pita one of the set. O-ring set for the injector will set you back around 8 to 10 bucks. Not much $$ involved, just the time to do it.
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