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Technical Info: 2nd Gen 12 VALVE DRIVETRAIN Technical discussion of second generation (1994 - 1998) 12-valve engine and drivetrain questions, solutions and upgrades.
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  #1  
Old 01-24-2021
racingskull6670 racingskull6670 is offline
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Default loss of power

My other thread got deleted for whatever reason, but I have a ppumped 24v that I'm experiencing low power issues that I've been trying to figure out.
Recently built this engine for my 4th gen 6 speed manual, its a destroked 6.7 ppumped. Its having trouble spooling even a stock hx35 and falls on its face over 2500 rpm.

stock vp injectors, .083 lines, 025 dv's, 100 fuel plate, 16* timing, fass 150,4k gov springs

I checked for air in the fuel feed and didn't see any, no boost leaks, new overflow valve, 20psi fuel pressure, messed with timing from 16-25*, messed with afc and the truck is still a dog and only gets 9-10 mpg. Starts and idles just fine, I do get a vibration after2800rpm though. Any help is much appreciated!!!
Thank you
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2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped

Last edited by racingskull6670; 01-24-2021 at 07:25 PM..
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Old 01-25-2021
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It wasn't deleted it was moved to the proper category, 4th gen drivetrain. This thread is also in the wrong area.
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2003 QC HO 6SPD, 305/555, 4WD, TST Controller W/monitor, fuel pressure guage, 100% Amsoil

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'96 2500SLT CC LB 2WD, KDP tabbed,100Hp Maxsticks,16* ,3k gsk,afc modded,#8 tst plate,62/70/13 turbo,4" MBRP exhaust,AFE stage III dry filter intake,autometer boost pyro, oil, tran temp,DSS,rebuilt diff & tranny w/billet triple lock TC w/lockup switch,1tn rear cylinders,ride rites on all 4 corners w/on board air,465k km. 330 hp 766 ft/lbs
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Old 01-25-2021
racingskull6670 racingskull6670 is offline
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Ah i see. How is this in the wrong place? Im asking about a ppumped engine
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2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
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Old 01-26-2021
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in a 4th gen truck.
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2003 QC HO 6SPD, 305/555, 4WD, TST Controller W/monitor, fuel pressure guage, 100% Amsoil

sold
'96 2500SLT CC LB 2WD, KDP tabbed,100Hp Maxsticks,16* ,3k gsk,afc modded,#8 tst plate,62/70/13 turbo,4" MBRP exhaust,AFE stage III dry filter intake,autometer boost pyro, oil, tran temp,DSS,rebuilt diff & tranny w/billet triple lock TC w/lockup switch,1tn rear cylinders,ride rites on all 4 corners w/on board air,465k km. 330 hp 766 ft/lbs
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Old 01-28-2021
racingskull6670 racingskull6670 is offline
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But why would i post in a common rail section for a ppumped engonw. That makes 0 sense. The truck has nothing to do with my question
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2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
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  #6  
Old 01-28-2021
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I have a simple question that may seem at first uneducated but depending on how you answer may provide the answer you are looking for. Here goes.

How did you get the P Pump to communicate with the computer?
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2005 Ram 2500 Quad Cab Laramie Short Bed 5.9l Cummins
2004 Ram 1500 Quad Cab SLT 5.7l Hemi V8
1998 Ram 1500 Quad Cab Sport 5.9l Magnum V8
1997 Ram 3500 Club Cab Dually SLT 5.9l Cummins
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Old 01-30-2021
racingskull6670 racingskull6670 is offline
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The engine will run on its own. I have a special tune to delete codes and let the truck recognize some sensors, and used a swaphelper crank sensor adapter to get my rpm signal
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2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
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Old 01-30-2021
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That answers your question. Your computer is not getting the proper inputs from the new tune. I'm actually surprised you are able to get it to run at all. Sounds like they sold you a defective tune. One thing you might try first is reinstalling the new tune. Sometimes these tunes don't take 100% on the first attempt. Get back in touch with the company you bought the tuner from and get them to troubleshoot it. And make sure to ask if you have the latest version of the tune. If you do, there may have been an earlier version that needed to be installed (FIRST). Good luck
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2009 Ram 2500 Mega Cab Laramie Sort Bed 6.7 Cummins
2005 Ram 2500 Quad Cab Laramie Short Bed 5.9l Cummins
2004 Ram 1500 Quad Cab SLT 5.7l Hemi V8
1998 Ram 1500 Quad Cab Sport 5.9l Magnum V8
1997 Ram 3500 Club Cab Dually SLT 5.9l Cummins

Last edited by klmahnke; 01-30-2021 at 03:50 PM..
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  #9  
Old 01-31-2021
racingskull6670 racingskull6670 is offline
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The engine has no computer running it. Its a ppumped 24v. All mechanical
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2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
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Old 4 Weeks Ago
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See my other post in your other thread.
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