6.0L Power Stroke Engine and DrivetrainDiscussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.
Guys I need some help please. I am new to the forum but have lurked for quite a while. I have an 05 with 94k and have done the following upgrades. Egr delete, arp studs, powermax, reg return, mbrp 4",rebuilt trans with billet converter, rebuilt injectors to 155/75, matts full fuel tune from gearhead, and edge cts monitor.
Since having the injectors installed, I immediately noticed a prevalent miss/stutter when the converter locks in 4th/5th. The sensation is that of running over a bumpy road. I had the sticks pulled and retested by builder. Came back "fine and flowing 155-162 @. 2.5 m/s pw. Reinstalled with new washers/orings. Same. Checked contribution. Was told it was fine. Swapped FICM. Same. Checked IPR no oil in plug. Change pigtail on vgt. Same.
I have no idea what else to check or change short of completely different injectors. Prior to adding the reg return and injector I had no drivability issues whatsoever. Anyone have any other ideas???
What does your boost reading do? The powermax is know to have that symptom when lugged with the converter locked. By that I mean heavy throttle with out the truck downshifting. Mine will do it badly when towing around 20 psi boost at lower rpms. My boost gauge flutters really violently and the truck begins to smoke. Clears immediatly after downshifting. It also does it with every tune i have from low tow to xtreme race. I believe it has something to do with the drive pressure being lower than the boost pressure.
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'05 F250 Lariat Crew Shorty Dark Stone FX4
AFE, MBRP single 304 4"w/ test pipe
ARP's w/ stock gaskets, Air Dog II 165
Driven Diesel Reg Ret fuel Kit
RCD Delete, 180/75's, 68mm VG Blow Jobby
Innovative Diesel Tuned SCT X3
Diesel Site coolant filter, Insight CTS
Overhead Auto Meters, Leveled
Homebrew traction bars
35x12.50x20 ATZ's on Ultra Mako's
Last edited by Derkperk; 12-22-2012 at 10:05 PM.
Reason: Fat fingered my iPhone
What does your boost reading do? The powermax is know to have that symptom when lugged with the converter locked. By that I mean heavy throttle with out the truck downshifting. Mine will do it badly when towing around 20 psi boost at lower rpms. My boost gauge flutters really violently and the truck begins to smoke. Clears immediatly after downshifting. It also does it with every tune i have from low tow to xtreme race. I believe it has something to do with the drive pressure being lower than the boost pressure.
Boost is steady and very consistent. No smoke when the truck is missing. I also should mention the the exact symptoms are present when I return the sct tuner to stock
When I increase acceleration pedal to over 35% 'ish, truck makes power and symptoms go away even in 5th with converter locked. Until I let off and resume cruising. Same symptoms on cruise control.
Iat2 sensor that was my problem is located in the intake manifold on the drivers side. May not be your problem but I tried several things before finding the issue there. As a Navistar tech told me as I worked with this issue, "when you find the problem it will probably be a sensor", he was correct; but even with state of the art diagnostic equipment, sometimes it is hard to isolate the root cause of conniptions on these engines. Hopefully you will find a simple low cost solution.
I had the exact same thing happen to my wife's Tahoe. Exact same symptoms. It was the internals of the Torque Converter. The had completely desintegrated. Every time the torque converter kicked in it would do that. We had to drive it home without overdrive. A new torque converter later it was perfect again.
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Martin - Fort Worth, Texas
2003 F-250 FX-4 --Build Date February 23, 2003 - 180,000 Miles -- Rotella T6 5W40 Synthetic - the only oil with Hot Shots Secrets -- Diamond Mfg. Brushguard - Made In Texas -- 4" Banks Turbo Back Exhaust - strictly straight pipe -- EDGE CS with Attitude and Turbo Down Timer/Pyro (Set on Level 3) -- Upgraded Oil Cooler International 1171962R1 (Dec 2009) -- EGR Block-off Kit (Dec 2009) -- Upgraded HPOP International 2591022C91 (Jan 2011) -- Upgraded Oil Drain Tube Ford 6C3Z-9T515 (Jan 2011) -- New Steering Stablizer (May 2011) -- Upgraded Fuel Pressure Regulator (blue spring) Ford 3C3Z-9T517-AG (June 2011) -- Rousch/Autometer Electronic Fuel Pressure Gauge (July 2011) -- ProForm Fabrication Front Leveling Shackles (July 2011) -- Dfuser Coolant Filter (July 2011) -- New Vacuum Hub Solenoid 7C3Z 9H465A (October 2011) -- New Motorcraft Thermostat RT1169 (November 2011) -- Bilstein 5125 Shocks 33-185569 Front and 33-185552 Rear (December 2011) -- New Sway Bar Links and Bushings Front and Back (December 2011) -- ARP Studs with Ford Motorcraft Head Gasket (December 2011) -- Moog Ball Joints K860T and K80026 (December 2011) -- Rebuilt front axle, repack bearings - Needle bearing No.C6TZ-3123A -- Glow Plug Control Module (November 2012) -- LH Glow Plug Harness and #4 Glow Plug (December 2012) -- Warn Hubs 38826 (December 2012)
Thanks for the details on the sensor. As far as the converter goes, it is a billet and less than a year old and never kicks out of locked unless it downshifts or you hit the brake. Talked with my trans builder and he swears it is not converter as there are no codes and he said it would not continue to lock. I am thinking it likely be injectors or a sensor. There was no problem until the injectors went in.
Any thoughts on the injector size/nozzles (155cc with .75 nozzle)?
Any other thoughts of what to check? Unchecked the function of the iat2 sensor and it seems to be functioning properly. My edge CTS shows it monitoring the temp accurately.
Anyone?? The strange thing is that once the converter is locked (overdrive) the truck misses ONLY when you give it enough throttle to sustain the speed. If you lessen throttle it disappears and if your increase the throttle to (still keeping converter locked) it disappears as well.
Just checked the static and dynamic fuel pressure under driving loads and while the missing is occurring there is NO drop in pressure and stays steady at 65psi. Only when full boost/fuel does it slowly fall to 58psi.
I would like to know this as well, as i believe this is what is happening to mine as well '05 with 6.0. Never had a problem until i deleted EGR and put the SCT Tune on. My mechanic said he bumped up the pressure in the trans, so i guess i should take that out to see if it goes away.
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2003 F-250 FX-4
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