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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion 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.

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Old 09-02-2009, 10:32 PM   #1 (permalink)
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No power, no boost

Great site! Good Info

2002 SD F250 7.3 TD max boost 6-7 psi no acceleration, power. Bully-Dog chip installed with no boost in any position. Injector cups recently replaced, is it possible they reinstalled component parts incorrectly?
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Old 09-03-2009, 07:45 AM   #2 (permalink)
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You need to take a look at the intercooler boots. They may have installed them and not properly tightened them back up or you could have a something else going on. Did it work before the injector cups?

[IMG][/IMG]
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2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....

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Old 09-03-2009, 11:51 AM   #3 (permalink)
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I inspected the boots and checked for security, seemed secure but evidence of some blow-by (soot streaks) around intercooler connections. Also have a high press oil pump external leak, oil press and quantity within limits. Truck sounds like waste gate not closing as like when warm-up high RPM, and the boost gauge indicates only a fraction of normal. EGT seems slightly higher too. Idle and unboosted runability seem normal. Prior to injector cup replacement ran strong in all chip modes, 20+ psi boost when needed.
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Old 09-03-2009, 01:20 PM   #4 (permalink)
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Check your exhaust back pressure valve (EBPV) to make sure it is not disconnected or partially closed.


[IMG][/IMG]


Also check to make sure the waste gate rod is connected to the wastegate lever. There is a small e-clip that holds it on. I can't imagine they pulled it apart for the injector cups, but who knows.

[IMG][/IMG]



If that all looks to be in order take a look at the wastegate solenoid and the tubing from the spider and to the wastegate actuator. It is hard plastic tubing red and green in color.

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2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....

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Old 09-03-2009, 04:01 PM   #5 (permalink)
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Great Diagrams! Thanks for the unselfish help. You have answered a lot of questions.

Shop says EBV diapham stuck and requires rebuilding kit and $511 P&L. I'm taking the truck to another shop for 2nd opinion.

Background: My daughter and I were involved in a very hard rear-end collision 17 mos ago. $16k in body and frame repairs. Truck ran flawlessly before impact accident and I just can't help but wonder what effect that must have on internal parts, sub-assys and components. Injector cup(s) cracked, high press oil pump leaks externally, Rear differintial seeps now, not before accident, now this. We were hit by KW semi at approx 35 mph with no skid marks prior to impact and slammed into another p/u in front of us and then ping-ponged through 4 elastic secondary impacts.

I have over 25 yrs in aviation as mech and pilot and know how machines operate, and I have to think that hard a shock to a system or component would likely cause damage. In fact my body still suffers from trauma as a result of the accident. You opinion is valued!
Thanks for the clear answers and diagrams.
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Old 09-03-2009, 04:22 PM   #6 (permalink)
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You can do it yourself if you are physically up to it. Here is a good write up: Gutting the Exhaust Back Pressure Valve - 1994-1997 Power Stroke FAQ
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Old 09-03-2009, 06:06 PM   #7 (permalink)
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So you have two basic options. The EBPV is between the turbo and the exhaust, basically a butterfly that closes to allow the truck to warm up quicker on cold days. Lots of guys remove the butterfly from the valve and plug off the holes with press fit plugs and snap rings. That is what the gutting procedure is showing. If you have a bad diaphram you need to rebuild the EBPV piston assy. This is a procedure you can handle if you have been working on planes (I've been working on jets 20 years). Like mentioned in another post "if your physically up to it" That is not the most comfortable area to work in and you will be laying over the motor for most of the job. You will more than likely need to remove the turbo and the pedestal to get access to it. Once removed the rebuild is pretty straight forward, then you need to put it all back together. On problem that does arise when this is happening is the piston walls are damaged and you would need a whole new pedestal if yours can't be salvaged. A new EBPV Pedestal is $511 through Powerstrokeshop.com.

Here is the instructions for the rebuild of the actuator.

[IMG][/IMG]
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2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....

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Old 09-03-2009, 06:15 PM   #8 (permalink)
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If you want to make sure the butterfly is not stuck, remove the rod end and see if you can freely move it by hand.

You can get the parts yourself to do this for around $140 from Dieselorings.com

Internationals P/N is 1833815C93

Here is a TSB on it too.
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2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....

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Old 09-04-2009, 11:48 PM   #9 (permalink)
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Resolved--1. Found EBPV control rod disconnected, full boost restored. 2. Hi press oil pump distro hose found cut/split o-ring, leak eliminated. Guys on this site tremendous help. Also found a new/better technician to help at Adam's diesel in Colorado Springs. Diagnostic equip a must, found some software issues in PCM; up-dates complied-with and back to 22+ PSI boost and the old girl snortin' down the road.
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Old 09-04-2009, 11:56 PM   #10 (permalink)
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Great news! Glad to hear she's snortin again! Get yourself an Autoenginuity scanner, it is a great diagnostic tool that will help to solve many issues that can come up.
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2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....

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