99 & up 7.3L Power Stroke Engine and DrivetrainDiscussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks 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 7.3L Power Stroke engine.
I was towing with my PSD as I always do. I pulled a pretty good grade with trailer in tow. EGT's were up, but nothing unusual. I exited the freeway and did about 4 miles city driving. I pulled another hill on the city streets. EGT's were back up again from the hill. I had to wait in a line and they dropped as usual. I was idling for about 10 minutes afterward and when I went to proceed I felt a severe power loss. The engine felt as though I had lost 1/2 my cylinders. It had a vibration similar to the rough idle at start (California Cackle), but would not smooth out. It could be stopped and restarted, but the power would not return. I let the truck idle for about 20 minutes and it fixed itself. I drove it home with no problem (towing), and it has run good. The oil and filter had 4000 miles on it. Fuel filter had 11000 miles on it. I changed oil, oil filter, fuel filter, and clean the air cleaner. I drove it for about another 200 miles. I went to tow again and everything was fine. About 80 miles into my trip I was climbing another grade, I pulled about 5 miles of the grade, when I felt the truck loosing power, and I had to pull to the side. It felt just like the previous time. I was able to limp off the freeway and get to a safe spot. I let it idle forever to see if the problem would clear itself like last time. It did not. I had turned on, and shut off the motor multiple times, but no resolution. The truck sat for about 1/2 hour and I tried it one more time. She fired right up, and idled smoothly. I drove it all the way home, and she has been running good ever since. I am afraid to tow with it again until I can figure out whats happening. Can anyone shed some light on what may be occuring? It's hard to fix something that doesn't leave a code, or go into complete failure.
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95 F350 4X4 CC,SRW,PSD,4:10, Built E40D,w/ steel upgraded planets, shift kit, stall, B&M trans pan w/ 3 extra quarts of fluid, Amsoil in trans, Trucool 24K trans cooler, 4" Superlift Suspension, 16.5X9.75 Weld Super Singles w/ B.F.G 35X12.50x16.5, Isspro Digital Pyro (Pre-Turbo), Autometer Ultra-Lite Boost, and Trans gauge in triple pillar pod, Banks D/P into 4" Exhaust with no Kitty, Banks Big Hoss Chip, Custom Billet Grill w/ Hella Driving Lights, Rancho RS9000 w/ Double Stabilizers, Flared Fenders & Running Boards, Ported Snorkel, K&N Filter, J/D Coolant Eye, 203*Thermostat, Line a Bed, Wood Grain Dash/Interior
2000 Excursion XLT, 4X4, PSD (Arizona Beige) - Getting ready to undergo a major change.
I'm not sure if your 95 has this, i also have no experience with it.
I also typed it wrong, it's Under Valve Cover Harness. UVCH http://www.youtube.com/watch?v=tL5_xYcZe3E
Of course the 95 has an under valve cover harness. They have glow plugs and HEUI injectors underneath the valve covers!
I think the only difference is the 94-97 has two plugs on each valve cover gasket. If you unplug one sides plugs from the gasket. Try to start the truck. If it doesn't start. Then that is the good side... if it starts and runs the same way, then you have the bad side unplugged.
Not a difficult fix, and not terribly expensive either. (Not sure what the OBS harness' cost. But the 99 and up are only about 25.00 each side.)
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Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics!'03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4
I was towing with my PSD as I always do. I pulled a pretty good grade with trailer in tow. EGT's were up, but nothing unusual. I exited the freeway and did about 4 miles city driving. I pulled another hill on the city streets. EGT's were back up again from the hill. I had to wait in a line and they dropped as usual. I was idling for about 10 minutes afterward and when I went to proceed I felt a severe power loss. The engine felt as though I had lost 1/2 my cylinders. It had a vibration similar to the rough idle at start (California Cackle), but would not smooth out. It could be stopped and restarted, but the power would not return. I let the truck idle for about 20 minutes and it fixed itself. I drove it home with no problem (towing), and it has run good. The oil and filter had 4000 miles on it. Fuel filter had 11000 miles on it. I changed oil, oil filter, fuel filter, and clean the air cleaner. I drove it for about another 200 miles. I went to tow again and everything was fine. About 80 miles into my trip I was climbing another grade, I pulled about 5 miles of the grade, when I felt the truck loosing power, and I had to pull to the side. It felt just like the previous time. I was able to limp off the freeway and get to a safe spot. I let it idle forever to see if the problem would clear itself like last time. It did not. I had turned on, and shut off the motor multiple times, but no resolution. The truck sat for about 1/2 hour and I tried it one more time. She fired right up, and idled smoothly. I drove it all the way home, and she has been running good ever since. I am afraid to tow with it again until I can figure out whats happening. Can anyone shed some light on what may be occuring? It's hard to fix something that doesn't leave a code, or go into complete failure.
id check fuel pressure possibly pump starting to drop off of pick up maybe clogged.just a thought
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2002 f250 lariat 7.3 200k(motor has 170k)
original 4r100 tranny....200k and counting
knock on wood......
tony wildman chip......
stock,economy,daily,towing,extreme,smoke.
red elc good for 150k
4r100 1-2 2-3 3-4sonnax accumulator valves,.427 sonnax line pressure mod valve
4.125"yes thats 4 1/8" diy tymar intake(size matters...lol)
AIH delete,ccv delete,zoodad mod,
4" exhaust no muff
built my own leafs for 4.0 of lift!!!!!!
18" xd bronze revolvers with 325 nittos to wrap them
isspro pyro and boost guages on pillar mount....
I was told if oil becomes too hot it will foam and not allow the injectors to fire. I'm sure this is possible, but why has it never happened before, and the oil was brand new the second time it happened?
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95 F350 4X4 CC,SRW,PSD,4:10, Built E40D,w/ steel upgraded planets, shift kit, stall, B&M trans pan w/ 3 extra quarts of fluid, Amsoil in trans, Trucool 24K trans cooler, 4" Superlift Suspension, 16.5X9.75 Weld Super Singles w/ B.F.G 35X12.50x16.5, Isspro Digital Pyro (Pre-Turbo), Autometer Ultra-Lite Boost, and Trans gauge in triple pillar pod, Banks D/P into 4" Exhaust with no Kitty, Banks Big Hoss Chip, Custom Billet Grill w/ Hella Driving Lights, Rancho RS9000 w/ Double Stabilizers, Flared Fenders & Running Boards, Ported Snorkel, K&N Filter, J/D Coolant Eye, 203*Thermostat, Line a Bed, Wood Grain Dash/Interior
2000 Excursion XLT, 4X4, PSD (Arizona Beige) - Getting ready to undergo a major change.
IF your using the proper oil, and it's not worn out. I doubt you had a foaming issue. (unless it was over filled) DIESEL oil has anti foaming additives in it.
The under valve cover harness could still very possibly be your problem. It's not unusual for them to loose contact, and then get better after the vibration of the motor they make better contact again.
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Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics!'03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4
The 94-97 models did not have the problem of the uvc harnesses coming unplugged (they also have 2 plugs per side) but they were prone to melting at the gp pins. This could cause these symptoms (intermittent) Remove the oil fill cap and if you smell burnt wiring this could be it. Also unplug each connector at the valve cover gasket and check for melted or damaged pins.
Did you put an additive in the oil? I have heard that some of those additives can actually make the oil foam because they are not designed for high pressure. But the way you described your problem, it sounded more like an intermittent problem, which made me think electrical.
No I have never used any types of additives. I change my oil and filter about every 4000 miles and run 15-40 Delo. I thought the harness under the valve covers was for glow plugs? Is it also for the injection system? Does the glow plug harness and injectors share the same harness coming out of the valve covers, or is the injection electrical located elsewhere?
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95 F350 4X4 CC,SRW,PSD,4:10, Built E40D,w/ steel upgraded planets, shift kit, stall, B&M trans pan w/ 3 extra quarts of fluid, Amsoil in trans, Trucool 24K trans cooler, 4" Superlift Suspension, 16.5X9.75 Weld Super Singles w/ B.F.G 35X12.50x16.5, Isspro Digital Pyro (Pre-Turbo), Autometer Ultra-Lite Boost, and Trans gauge in triple pillar pod, Banks D/P into 4" Exhaust with no Kitty, Banks Big Hoss Chip, Custom Billet Grill w/ Hella Driving Lights, Rancho RS9000 w/ Double Stabilizers, Flared Fenders & Running Boards, Ported Snorkel, K&N Filter, J/D Coolant Eye, 203*Thermostat, Line a Bed, Wood Grain Dash/Interior
2000 Excursion XLT, 4X4, PSD (Arizona Beige) - Getting ready to undergo a major change.
See the white plug on the injector? That's to them. The GP is one black wire that goes down right next to each injector.
Yes they use the same harness.
I wasn't insinuating the early body styles had problems with the plug coming unplugged/loose. But I knew they were prone to some problems under there too...
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Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics!'03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4
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