Locked in High Boost - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 10-05-2009, 03:32 PM Thread Starter
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Locked in High Boost

Folks…

I have come across a perplexing problem with my late 04 model F250. About two weeks ago my truck started running “different.” Shift point were much higher in the RPM band, turbo farts happened continuously (not just after sudden decel, but while gradual decel too) I have an SCT Livewire and took readings before (when the truck was running “normal”) and after when it started misbehaving. The reading were on the same stretch of road under very similar weather conditions (i.e. flat-straight road, no wind, 80 degrees, cruise set, no A/C)

The before numbers were: idle [-2 to -2.2 psi boost], 75 mph, [9-10 psi boost, 190-192 coolant temp.]

The after numbers were: idle [-1.7 to -1.8 psi boost] 75 mph, [21-23 psi boost, 202-204 coolant temp.]

Boost on a normal accel (exit ramp to highway) went from 18-19 psi to 25-26 psi.

It’s like I’m stuck in a high-boost-high-demand condition. If it were a gasser I would say the choke plate was stuck closed. I replaced the EBP sensor 500-700 miles ago, air filter is clean, no trouble codes (other than a P0000). I am in the process of updating my AutoEnginuity so that hasn’t been run yet. Any ideas??? Coked up turbo ??? whacked sensor??

Never, ever moon a werewolf!!!

2004 F250 SD 6.0 Crew SB,
Auto, CX Gray, AFE Stg II, 4" Turbo back MBRP exhaust, Stage I Fuel mod, Gunner Chrome, Recon Plastics, Marinco mod, Rhino Lined, DBA/Hawk Brakes, SCT Livewire w/ Elite Diesel Toons , A.R.E Bedcap, Mag Hy-Tec Diff cover, Home Engineered Oil Bypass System, Kenwwod DNX5120, Clifford Auto-start, 58V Swamp's FICM.

+ = :burnout
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post #2 of 7 Old 10-05-2009, 03:59 PM
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It sounds like you are running a "hotter" tune but if thats not it then I have no idea!?

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake, coolant filter, 140cc Injectors and lots of running lights.

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Thanks. I'll give er a good wackin in the morning.
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post #3 of 7 Old 10-05-2009, 04:08 PM
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Quote:
Originally Posted by Jetmek319 View Post
Folks…

I have come across a perplexing problem with my late 04 model F250. About two weeks ago my truck started running “different.” Shift point were much higher in the RPM band, turbo farts happened continuously (not just after sudden decel, but while gradual decel too) I have an SCT Livewire and took readings before (when the truck was running “normal”) and after when it started misbehaving. The reading were on the same stretch of road under very similar weather conditions (i.e. flat-straight road, no wind, 80 degrees, cruise set, no A/C)

The before numbers were: idle [-2 to -2.2 psi boost], 75 mph, [9-10 psi boost, 190-192 coolant temp.]

The after numbers were: idle [-1.7 to -1.8 psi boost] 75 mph, [21-23 psi boost, 202-204 coolant temp.]

Boost on a normal accel (exit ramp to highway) went from 18-19 psi to 25-26 psi.

It’s like I’m stuck in a high-boost-high-demand condition. If it were a gasser I would say the choke plate was stuck closed. I replaced the EBP sensor 500-700 miles ago, air filter is clean, no trouble codes (other than a P0000). I am in the process of updating my AutoEnginuity so that hasn’t been run yet. Any ideas??? Coked up turbo ??? whacked sensor??
21-23 psi at 75 seems kinda high without a load. good possibilty turbo vanes are stuck. one way i have heard to maybe check is from a stop go straight from brake to full throttle from a stop and see if the truck takes a little bit to get up and go if so then good chance vanes are stuck open.

03 F350 6.0 SRW 4X4 lariat

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post #4 of 7 Old 10-06-2009, 04:15 PM Thread Starter
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Thanks for the replies. I should have mentioned that the truck is running stock right now, no tunes applied and the numbers you see are without any load on the truck other than my sorry butt. It sounds like it is time to open up the turbo and clean out the burnt up gremlins.

Never, ever moon a werewolf!!!

2004 F250 SD 6.0 Crew SB,
Auto, CX Gray, AFE Stg II, 4" Turbo back MBRP exhaust, Stage I Fuel mod, Gunner Chrome, Recon Plastics, Marinco mod, Rhino Lined, DBA/Hawk Brakes, SCT Livewire w/ Elite Diesel Toons , A.R.E Bedcap, Mag Hy-Tec Diff cover, Home Engineered Oil Bypass System, Kenwwod DNX5120, Clifford Auto-start, 58V Swamp's FICM.

+ = :burnout
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post #5 of 7 Old 10-06-2009, 04:23 PM
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When mine were sticking, I could get on it and it would all go fine, let off and get right back in the throttle and I would have no boost and tons of black smoke with no power. I cleaned the vanes and deleted the EGR sys and it is perfect now

05 F250 4x4 CC, 9.5" Rize/Icon, 38" Toyos, 20x12 Pacers, 5" MBRP, AFE stage 2, Cass 190s, Powermax, ELC w/filter, RCD EGR delete
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post #6 of 7 Old 10-07-2009, 05:26 AM
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Stuck turbo vanes... take it apart and clean it. Be careful applying full throttle, as it will want to overboost.


1991 Volkswagen Jetta 1.6TD ECOdiesel -- 423,000 miles
2003 Ford F-350 6.0 -- 131,000 miles
1987 Mercedes-Benz 300SDL -- 307,500 miles

2000 Volkswagen New Beetle TDI (RIP)
1987 Mercedes-Benz 190D 2.5 Turbo (sold)


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post #7 of 7 Old 10-07-2009, 05:46 AM
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the trucks are set so that if it overboosts it either defuels or dumps the extra boost off



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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