03 f550 no power at higher rpm - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 04-08-2014, 08:51 PM Thread Starter
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03 f550 no power at higher rpm

Driving 2003 f550 with 6.0 and truck seams to run ok but when I go to go up a small hill I loose all power and speed like going from 70mph to 5mph in about 30 seconds but I still have 2,500 rpm I shift into 1st 2nd and 3rd gear and trans shifts and rpm is good but truck will not go over 10mph untill I shut off the truck and start it again and it will run good untill it goes back up a small hill and starts over again. What should I do

I think it is great that Cummings service trucks are f-550 with 6.0 and 6.4. They must know somthing?

2006 F-250 lariat FX4

4" turbo back MBRP stainless steel exhaust cat delete
Airaide intake
Homemade coolant filter
Custom oil bypass filter
Quad pillar gauges EOT, ECT, Fuel pressure, and EGT
RCD EGR kit with new up pipe
Blue Ford fuel spring went form 45psi to 68psi part number 3C3Z-9T517-AG
Rancho Rs9000 shocks with my ride controll
Homemade 3" lift
315x70x17 BFG AT's
SCT With custom Innovative tunes
Mobil ELC Cat-1 Coolant
2004 Turbo
Zoodad mod
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post #2 of 9 (permalink) Old 04-09-2014, 01:32 AM
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Ok, so you're saying you're maintaining 2500rpm but the truck will slow from 70 to 5mph? There is something wrong with the transmission or the PCM or both. Have you checked the fluid level? Do you know much about the truck, like how many miles, could it have been services with the wrong fluid? The truck should have a trans temp gauge in the cluster. Also, there should be a check engine light on in the cluster. Pull codes with your SCT device from the truck in your signature, engine light of not.

The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan

7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4

6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4

6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift
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post #3 of 9 (permalink) Old 04-09-2014, 05:40 AM Thread Starter
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Quote:
Originally Posted by IdahoF350 View Post
Ok, so you're saying you're maintaining 2500rpm but the truck will slow from 70 to 5mph? There is something wrong with the transmission or the PCM or both. Have you checked the fluid level? Do you know much about the truck, like how many miles, could it have been services with the wrong fluid? The truck should have a trans temp gauge in the cluster. Also, there should be a check engine light on in the cluster. Pull codes with your SCT device from the truck in your signature, engine light of not.
No cell or cods. Transmission is full of fluid truck has 150k and all fluids and filters are good use only motorcraft. Transmission shifts fine I can count all gears just when it goes to go up a hill it just has no power I have tried to shift the truck up and down but only thing that changes is the rpm still no power

I think it is great that Cummings service trucks are f-550 with 6.0 and 6.4. They must know somthing?

2006 F-250 lariat FX4

4" turbo back MBRP stainless steel exhaust cat delete
Airaide intake
Homemade coolant filter
Custom oil bypass filter
Quad pillar gauges EOT, ECT, Fuel pressure, and EGT
RCD EGR kit with new up pipe
Blue Ford fuel spring went form 45psi to 68psi part number 3C3Z-9T517-AG
Rancho Rs9000 shocks with my ride controll
Homemade 3" lift
315x70x17 BFG AT's
SCT With custom Innovative tunes
Mobil ELC Cat-1 Coolant
2004 Turbo
Zoodad mod
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post #4 of 9 (permalink) Old 04-09-2014, 06:00 AM
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So is the transm slipping or is the engine power just falling on it's face?

If it's the engine power falling off, could be turbo issue, ficm issue, fuel filter issue.

Harry

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
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post #5 of 9 (permalink) Old 04-09-2014, 08:25 AM
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The descriptions of what's going on here are pretty vague. With a lack of any codes, it had to be something the truck is unable to recognize as a fault. The only time my 6.0 ever had a complete lack of power while running was when the EGR valve was stuck open. Almost got T-boned it's was so bad. Good luck. I'd strongly suggest seeking out someone with AE or a high end scan tool to monitor data and see what's going on.

The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan

7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4

6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4

6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift
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post #6 of 9 (permalink) Old 04-09-2014, 02:08 PM Thread Starter
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Trans does not seam to be slipping just lack of any power. Truck gas egr delete in it so I guess I am going to pull turbo and check and also check ficm and go from there.

I think it is great that Cummings service trucks are f-550 with 6.0 and 6.4. They must know somthing?

2006 F-250 lariat FX4

4" turbo back MBRP stainless steel exhaust cat delete
Airaide intake
Homemade coolant filter
Custom oil bypass filter
Quad pillar gauges EOT, ECT, Fuel pressure, and EGT
RCD EGR kit with new up pipe
Blue Ford fuel spring went form 45psi to 68psi part number 3C3Z-9T517-AG
Rancho Rs9000 shocks with my ride controll
Homemade 3" lift
315x70x17 BFG AT's
SCT With custom Innovative tunes
Mobil ELC Cat-1 Coolant
2004 Turbo
Zoodad mod
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post #7 of 9 (permalink) Old 04-10-2014, 01:14 PM Thread Starter
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Well found that truck had a bad icp o leaking out of it and turbo was dirty and stuck so I replaced icp and harness, cleaned turbo and changed fuel filters and drove truck and same thing happened except this time I could te when truck shifted from 3rd to 4th gear it seamed not to go into 4th and stay in between gears and truck slowed down from 50 to 5 and died took about 5 minn to get it to start again. So I don't know maybe a trans problem or coult it be a toque converter issue becuses the truck still acts like it is under a load but it just has no power

I think it is great that Cummings service trucks are f-550 with 6.0 and 6.4. They must know somthing?

2006 F-250 lariat FX4

4" turbo back MBRP stainless steel exhaust cat delete
Airaide intake
Homemade coolant filter
Custom oil bypass filter
Quad pillar gauges EOT, ECT, Fuel pressure, and EGT
RCD EGR kit with new up pipe
Blue Ford fuel spring went form 45psi to 68psi part number 3C3Z-9T517-AG
Rancho Rs9000 shocks with my ride controll
Homemade 3" lift
315x70x17 BFG AT's
SCT With custom Innovative tunes
Mobil ELC Cat-1 Coolant
2004 Turbo
Zoodad mod
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post #8 of 9 (permalink) Old 04-10-2014, 05:04 PM Thread Starter
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Ok been driving truck around today and truck runs great 55 mph and under and gears 1-4 but if truck goes over 55 mph and tries to shift into 5 gear truck pretty much falls on it face in power untill truck dies wait a few min truck will start again and run great as long as I stay under 55 mph and it does not try to shift into 5th gear or I am stuck on the side of the road. Truck still has no cell or codes.

I think it is great that Cummings service trucks are f-550 with 6.0 and 6.4. They must know somthing?

2006 F-250 lariat FX4

4" turbo back MBRP stainless steel exhaust cat delete
Airaide intake
Homemade coolant filter
Custom oil bypass filter
Quad pillar gauges EOT, ECT, Fuel pressure, and EGT
RCD EGR kit with new up pipe
Blue Ford fuel spring went form 45psi to 68psi part number 3C3Z-9T517-AG
Rancho Rs9000 shocks with my ride controll
Homemade 3" lift
315x70x17 BFG AT's
SCT With custom Innovative tunes
Mobil ELC Cat-1 Coolant
2004 Turbo
Zoodad mod
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post #9 of 9 (permalink) Old 04-11-2014, 01:19 AM
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You need to get someone with proper diagnostic equipment to take a look at the truck and watch what's going on while you replicate the situation for them so that they can identify it and keep you from spending money on things that aren't broken.

The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan

7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4

6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4

6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift
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