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| 2003 to 2007 6.0L Power Stroke Diesel 6.0L Power Stroke Diesel equipped Super Duty and Excursion. |
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#1
Mon, July 19th, 2010, 06:17 AM
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sounds like you may have a leak somewhere.I would start there first.
__________________
 Is in the php shop .. the best way to contact me is by email ......brad@phptune.com looking foward to hearing from and helping all of you. Brad Scott PHP 
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#2
Mon, July 19th, 2010, 05:11 PM
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No signs of leakage anywhere. Blocked off egr results in DTC's p0401 and p0404 while only disconnecting the egr connector I get p0401 and p0405. Boost limits to 20psi either way.
__________________
2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build PHP FICM & Rolled Back ECM/TCM 
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#3
Mon, July 19th, 2010, 07:12 PM
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well after some homework that i had to do with this problem, and let me say i have seen alot of this same problem...even with tuning with some of the lateter strats the egr valve MUST BE PLUGED UP EVEN IF THE VALVE IS A DUMMY !!!!!!!... if the valve is not plugged up the vvt will not work properly and will not let the turbo spool right..do you have the egr valve plugged up ???
__________________
Is in the php shop .. the best way to contact me is by email ......brad@phptune.com looking foward to hearing from and helping all of you. Brad Scott PHP
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#4
Mon, July 19th, 2010, 10:30 PM
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I have a plug in the egr hole machined to match the egr valve dimensions with the o-rings in place to block the flow into the intake. The egr valve itself is plugged in to the harness but I have it bolted to the intake elbow where it can do it's thing without polluting my engine. I have one more thing to try I'll report back when I test it out.
__________________
2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build PHP FICM & Rolled Back ECM/TCM
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#5
Tue, July 20th, 2010, 01:03 AM
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Tried a different egr valve hooked to the harness with my blocker in place to see if the position sensor was bad and it does the same thing. Only after a few miles of driving code P0401 pops up and the commanded egr duty cycle goes to 0% and under WOT boost is limited to 20psi.
I know my truck originally didn't have this problem. I ran with it blocked for a long time without issue until I got reflashed when at the dealer for the trans update and apparently that flash was the one where the ecm started going into the supposed "EPA" mode when P0401 is set. I figured rolling back the strategy should've eliminated this issue but it hasn't. Bill set it back to a VXBC4 from the VXBC9 that I had which we figured should've been the original but maybe it should be earlier still.
__________________
2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build PHP FICM & Rolled Back ECM/TCM
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#6
Thu, July 22nd, 2010, 11:37 AM
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I haven't been able to get around this in any way. If I was to buy a Gryphon CS could a custom tune be made to eliminate the egr strategy altogether? Seems like I found a good excuse to buy one.
__________________
2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build PHP FICM & Rolled Back ECM/TCM
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#7
Thu, July 22nd, 2010, 12:43 PM
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One way or another, I will get an answer for you.
__________________
Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years. Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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