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Old 01-14-2013, 05:10 PM   eBay Motors  #1 (permalink)
 
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01 falls on face during acceleration

01 duramax sometimes seems to fall on its face when accelerating, usually when getting on the freeway or going over 60mph, it used to cutout when it would do it and the check engine light would come on then it won't go over 2000rpm?
Even if it is in park and you rev the engine it won't go over 2000rpm.
It is throwing a P0101 and a P0093, any suggestions?
I did replace the fuel filter a couple months ago and problem went away for a while.
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Old 01-14-2013, 05:38 PM   eBay Motors  #2 (permalink)
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P0093 is a "fuel leak large" code. It triggers the DTC light, and sets the truck into "limp mode." Your fuel pump (CP3 pump) is not keeping up with the fuel required at the time. Some people have tried numerous things to fix it. The only thing I have seen "FIX" it perminently is replacing the CP3 pump.

The pump is old and weakening. When it needs to pump the high pressures commanded for that long of a time it just can't anymore. If you have a scanner that can read Rail Pressure, compare the Command vs Actual when this usually occurs.
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Old 01-14-2013, 05:39 PM   eBay Motors  #3 (permalink)
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Replace the fuel filter and cut this one open to see what it looks like inside. Where do you fuel up? It could be that you are getting bad fuel plugging your filter up.
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Old 01-14-2013, 05:58 PM   eBay Motors  #4 (permalink)
 
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Is it a mechanical or electrical fuel pump?
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Old 01-14-2013, 06:10 PM   eBay Motors  #5 (permalink)
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Its gear driven. There is no pump in the tank. The pump is in the valley of the motor. It sucks the fuel from the tank by vaccume, and then pressurises it up to 23,000 psi to the injectors.
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Old 01-14-2013, 06:16 PM   eBay Motors  #6 (permalink)
 
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Thank you I will change it out and see.
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Old 01-14-2013, 06:21 PM   eBay Motors  #7 (permalink)
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It's not cheap... But a new one should come with a new Fuel Pressure Regulator. And you can find a LB7 CP3 for $650, so dont pay the 800 bucks alot of websites are asking for.
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2001 GMC Sierra 2500HD, CC,SB
EFI Live V2 w/dsp5 MAX EFFORT by Idaho Rob,
EGT's Never higher than 1150*
Cognito Braces, and ATP Sleeves, BD Manifold, ARP H.Studs, M.P. mod, MA Aluminum Bleeder, PPE Boost Valve, Banks Ram Air- Intercooler, FASS 150, LBZ FPR, Shimmed FPRV, 4" MBRP turbo back exhaust w/6"tip, Corsa Muffler
@180,000-New injectors from Lincoln Diesel, CAT Adapter/filter/spacer

Air Lift, Bilstein Shocks, Leveling Kit, Recon LED tail lights & over cab lights, 20" Forged Aluminum WELD Racing Rims, 295/55/20 Nitto Trail Grappler Tires
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Old 01-14-2013, 06:25 PM   eBay Motors  #8 (permalink)
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By the way P0101 is a dirty MAF sensor. Or dirty filter effecting the MAF sensor. Clean/change the filter and then clean the MAF sensor with MAF cleaner found at the local parts store. If you have a oiled filter the oil could be covering the sensor, and it may take a few cleanings.
__________________
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Lincoln Diesel Specialties
"Quality Parts and Service at an Unbeatable Price"

Or call us... 920-765-1615


SOLD
2001 GMC Sierra 2500HD, CC,SB
EFI Live V2 w/dsp5 MAX EFFORT by Idaho Rob,
EGT's Never higher than 1150*
Cognito Braces, and ATP Sleeves, BD Manifold, ARP H.Studs, M.P. mod, MA Aluminum Bleeder, PPE Boost Valve, Banks Ram Air- Intercooler, FASS 150, LBZ FPR, Shimmed FPRV, 4" MBRP turbo back exhaust w/6"tip, Corsa Muffler
@180,000-New injectors from Lincoln Diesel, CAT Adapter/filter/spacer

Air Lift, Bilstein Shocks, Leveling Kit, Recon LED tail lights & over cab lights, 20" Forged Aluminum WELD Racing Rims, 295/55/20 Nitto Trail Grappler Tires
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Old 01-14-2013, 06:42 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by 01 D_Max View Post
P0093 is a "fuel leak large" code. It triggers the DTC light, and sets the truck into "limp mode." Your fuel pump (CP3 pump) is not keeping up with the fuel required at the time. Some people have tried numerous things to fix it. The only thing I have seen "FIX" it perminently is replacing the CP3 pump.

The pump is old and weakening. When it needs to pump the high pressures commanded for that long of a time it just can't anymore. If you have a scanner that can read Rail Pressure, compare the Command vs Actual when this usually occurs.
Is it possible he has a dirty or gelled fuel filter? I had the same symptoms and the same code thrown when I first bought my truck. Clean fuel and a new fuel filter fixed it.
__________________
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Bear Claw Front and Rear Bumpers
EFI Live DSP5 from ATP/Rob, port and polished stock IHI turbo w/ Batmo Wheel, 3" Down Pipe, 4" straight pipe from the downpipe, intake horn mod, modded air box, custom overhead gauge console, pyro and boost gauges
Cognito UCA, Kyrptonite Straight Centerlink and Tierods, BFG KM2 255-85 on stock wheels

Truck Pictures
Bumper Build
www.performancetruckproducts.com
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Old 01-14-2013, 06:51 PM   eBay Motors  #10 (permalink)
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Yes... And honestly I would start there too, but you already said it, so I didnt see the need to repeat you. It wouldnt hurt to inspect the quality of the fuel.

The fact that He has changed the filter and it helped for a short time, is another reason to inspect it now.

If he looks into the fuel quality, and does the rail pressure test before He buys a new one He will know if the CP3 is weak. It will climb in PSI then max out and drop, or never get above say 18k psi when it needs to be 21k psi.


But in the end, Im sure it's His CP3.
__________________
-Aaron-
Lincoln Diesel Specialties
"Quality Parts and Service at an Unbeatable Price"

Or call us... 920-765-1615


SOLD
2001 GMC Sierra 2500HD, CC,SB
EFI Live V2 w/dsp5 MAX EFFORT by Idaho Rob,
EGT's Never higher than 1150*
Cognito Braces, and ATP Sleeves, BD Manifold, ARP H.Studs, M.P. mod, MA Aluminum Bleeder, PPE Boost Valve, Banks Ram Air- Intercooler, FASS 150, LBZ FPR, Shimmed FPRV, 4" MBRP turbo back exhaust w/6"tip, Corsa Muffler
@180,000-New injectors from Lincoln Diesel, CAT Adapter/filter/spacer

Air Lift, Bilstein Shocks, Leveling Kit, Recon LED tail lights & over cab lights, 20" Forged Aluminum WELD Racing Rims, 295/55/20 Nitto Trail Grappler Tires
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