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| Duramax 2004.5-2005 (LLY) Discussion related to the 2nd Generation Duramax engines |
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#1
10-15-2009, 10:44 AM
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Power Loss WTF
I've experence this a couple of times while towing our 30' artic fox and with just our balloon trailer.
When I try to acellerate above 2k RPM's there is a loss of power just like the engine is starved for fuel. If I pull over and shut the truck off for 30 to 45 seconds the engine starts right up and no further problems and it may not do it again. This has happen about six months ago and then again on a trip to Denver last weekend. Any ideas? 
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2005 GMC LLY, Edge Juice w/ Atitude, K&N CAI, Moto Blue 4" Turbo Back w/ Quiet Thunder Down Pipe,Mike L transmission cooler, Fan Damn, V2, 2003 Artic Fox 29-5E 5er, B&W Companion Receiver. 94,000 cu/ft Firefly Hot Air Balloon "Simonsez", Lake Powell Houesboat "Incognito" at Halls Crossing. 
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#2
10-15-2009, 02:51 PM
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When was the last time you changed the fuel filter?
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2005 3500 LT CC LB 4X4 DRW Dmax/Alli Rhino Lining, Blocked, Fingerstick, Fumoto valve, 4" MBRP (Bye, Bye Kitty!), LBZ MP 2003 Medallion 36SKQ 1998 Triton TR21 DC with a 2004 225 Evinrude DI It only took 5 minutes.....   Also, RIP Grizz, it was a fun hour and a half.
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#3
10-15-2009, 04:51 PM
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Got a scan tool? Any stored codes?
FPRV can cause similar symptoms.... but I'd do as previous poster said and do filter first. Intermittent stuff is the worst....
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2005 GMC Sierra 2500HD 4X4 CCSB Duramax/Allison Summit White 265/75/16 "E" Revos, Tonneau Cover, Step Tubes, Bug Shield, Tekonsha Prodigy, BD Manifold, Diamond Eye Downpipe, Silverline SS CAT Delete, Borla Exhaust, PCV Reroute, EGR Blocker, KB IOH  Rad Mod V2 w/ Fan Fan Damn H.O. CAI 2008 Lund Tyee 1950 Gran Sport Deep V 225HP Mercury Optimax, Mercury 9.9HP Pro Kicker 4-Stroke, and all the goodies! 2003 Yamaha Grizzly 660 1998 Ski Doo Formula 3 700 triple 2- 1985 Honda 200-S Three Wheelers!  It only took 5 minutes..... RIP Grizz, it was a fun hour and a half. 
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#4
10-26-2009, 07:58 PM
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Had the same problem a couple of years ago. Turns out the wire harness had rubbed through where it was tied to an aluminum stand near the front of the right valve cover. Wrapped it up an tied it to the stand again. Problem solved.
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'05 2500HD C/C S/B D/A Dark Blue
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#5
11-03-2009, 08:20 AM
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Quote:
Shim it and this problem will go away forever.
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#6
01-19-2010, 02:33 PM
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Well after all this time I finally have some answers.
We left on a 3800 mile trip back in Nov. to my daughters grauation from USAF Officer training. Drove the 5er to Montgomery, AL then to San Antonio were she will be stationed. On the trip I experienced the loss of power when down shifting on hills but not a lot of hills in TX, OK, MS, & AR. but it did quit a couple of times. I found that if I shut the truck down and then primed the filter it would run just fine until down shifted and needed some power. We had the filter changed in Pecos on our way home but I was having more power losses as we went up to Santa Fe. I took it into a dealership in S.F. but in 4 hours, removing the tank, changing some lines, another new filter they found nothing, but the truck was running so bad after the work that we had to leave the 5er in Espanola and limp home at 30mph up the passes in CO. I took the truck into our local dealer and after a day and several test runs they found grass clippings in the banjo bolt at the fuel pump before the filter. I can only think that some little B#%$&%d in the neighborhood put grass in my tank when the truck was parked out on the street. Total cost about $900
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2005 GMC LLY, Edge Juice w/ Atitude, K&N CAI, Moto Blue 4" Turbo Back w/ Quiet Thunder Down Pipe,Mike L transmission cooler, Fan Damn, V2, 2003 Artic Fox 29-5E 5er, B&W Companion Receiver. 94,000 cu/ft Firefly Hot Air Balloon "Simonsez", Lake Powell Houesboat "Incognito" at Halls Crossing.
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#7
01-20-2010, 06:25 AM
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Wow! That's strange. I guess your going to have to get a locking fuel cap. I got one when fuel went to over $4 per gallon.
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2005 3500 LT CC LB 4X4 DRW Dmax/Alli Rhino Lining, Blocked, Fingerstick, Fumoto valve, 4" MBRP (Bye, Bye Kitty!), LBZ MP 2003 Medallion 36SKQ 1998 Triton TR21 DC with a 2004 225 Evinrude DI It only took 5 minutes..... Also, RIP Grizz, it was a fun hour and a half.
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#8
01-20-2010, 06:48 AM
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Wow, never would of thought of that. Good find.
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 '05 CCSB D/A LLY- V2 w/fan, Fan Damn Max, 45 gal Transfer Flow replacement tank, multiple gun racks, B&W turn over gooseneck hitch, Curt class 4 receiver hitch, cranked T-bars, 2" GM rear spacers, Rancho RSX9000, BFG All-Terrain T/A 285/70-17 on Hummer H2 wheels, Added 2nd generator, 2 sets of train horns, plus a bunch of other stuff. '94 Yamaha V-Max, '99 Ducati 996s, '07 Yamaha FZ1 '05 Desert Fox 28ks toy hauler- 12' 9" tall 102" wide Total Combined Weight 21,700#  It only took 5 minutes..... RIP Grizz. It was a fun hour and a half
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