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01-05-2007, 09:25 PM
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#1
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Rivet Master
1984 31' Excella
Abernathy
, Texas
Join Date: Jun 2002
Posts: 865
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Duramax/Allison Losing Power...???
I have a 2002 GMC Duramax/Allison.
When accelerating from a standstill, you can pour the pedal to it and it will accelerate furiously until 3rd gear....then approaching 2800 rpms, it just acts starved for fuel or air and just loses power right when you think it should shift and pin you to the seat again.
All the get up and GO, just stops, and until you back out of it and let it shift soft, it will just stay there at 2800 rpms and not go on no matter how much pedal you give it.
Also, traveling at 65-75 mph, and romping down on it to pass, it will shift down and accelerate like the devil until about 2800 rpms in 4th, and it just acts fuel starved and no power.....until you back out of it and let it shift soft and sort of "catch up".
Once it shifts you can accelerate swiftly, as long as it doesn't downshift, all the way out to 96 mph where it is topped out.
I don't understand what is happening.
Is it fuel starved from filter being clogged, or injector pump not keeping up? If so, how could it run over 90 mph?
Is the turbo kicking out?
Is the Allison tranny screwing up?
Any ideas why I am experiencing this?
It hasn't happened before....until now, I oculd pour the pedal to it and it would run like the wind...shift all the way up...and when it got to those critical 2800 rpms places, hit the next gear and pin you to the seat....now it isn't.
I don't know what the deal is, and would like the advice and help of the forum experts, please?
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01-05-2007, 10:08 PM
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#3
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Rivet Master
Currently Looking...
West of Fort Worth
, Texas
Join Date: Aug 2006
Posts: 6,699
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I've repaired many diesels with those same symptoms with a fuel filter change. If it's a recurring problem, you may have algae growing in your fuel tank. Diesel will suspend enough water in it to actually grow algae, as wierd as that may sound. I would go the fuel filter route first.
Dave
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01-05-2007, 10:25 PM
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#4
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Rivet Master
1984 31' Excella
Abernathy
, Texas
Join Date: Jun 2002
Posts: 865
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Thx Dave...I was thinking it sure feels more like fuel starved more than anything.
I am guessing that there is also some tank treatments available to kill any growing bugs?
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01-05-2007, 10:28 PM
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#5
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Rivet Master
1984 31' Excella
Abernathy
, Texas
Join Date: Jun 2002
Posts: 865
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Quote:
Originally Posted by wingfoot321
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Forums there are being moved to new server this weekend and are presently read only....I'll have to wait to post there.
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01-05-2007, 10:29 PM
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#6
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Rivet Master
Currently Looking...
West of Fort Worth
, Texas
Join Date: Aug 2006
Posts: 6,699
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Yes there are, but if the fuel is contaminated, you usually would need to drain or pump the fuel out and start over. If you kill the algae, it is still going to be in there. IMO, the additives work better for prevention, or to control a mild case of contamination. Good luck.
Dave
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01-06-2007, 06:20 AM
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#7
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3 Rivet Member
2007 25' International CCD FB
Rochester
, New York
Join Date: Sep 2005
Posts: 159
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try posting to:
Diesel Place - Duramax Diesel Discussion Forums
this is a site dedicated to Duramax diesel similar to AirstreamForums
__________________
Mike & Joan
WBCCI #1521 New England Unit
07 25' International CCD FB
06 Chevy Duramax/Allison
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01-06-2007, 06:37 AM
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#8
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Rivet Master
2004 30' Classic Slideout
2021 33FB Classic
Colleyville
, TX
Join Date: May 2005
Posts: 1,540
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D.I.C. advisory
GM may be trying to help owners who forget regular fuel filter changes by now programing into the DIC an advisory as to how much time is left until a change is recommended. Pretty cool idea and it may help us out.
__________________
In dog years, I'm dead!
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01-06-2007, 07:32 AM
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#9
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1 Rivet Short
1989 25' Excella
By The Bay
, Rhode Island
Join Date: Apr 2006
Posts: 1,620
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Classic symptom of a clogged fuel filter...
__________________
*Life is Good-Camping all around the Continent*
*Good people drink good beer-Hunter S Thompson*
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01-06-2007, 07:58 AM
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#10
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Rivet Master
1976 25' Caravanner
Vintage Kin Owner
Campton
, New Hampshire
Join Date: Feb 2006
Posts: 1,113
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Quote:
Originally Posted by BillTex
Classic symptom of a clogged fuel filter...
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Almost always , first step , second step , check the air filter . If you have algae the fuel will look slimmy in the filter . Good luck , and let us know the outcome.
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01-06-2007, 08:10 AM
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#11
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Rivet Monster
1975 31' Sovereign
1980 31' Excella II
Sprung Leak
, North Carolina
Join Date: Jun 2003
Posts: 7,172
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David,
If I read you correctly it will accelerate hard in 1-3 gears then die off in 4th? That is not a fuel feed problem that sounds more like a transmission program error. I am not familiar with the Duramax/Allison combo at all. I am an first generation PSD man myself But if it pulls hard in the lower gears it is not fuel or air flow.
Aaron
__________________
....so many Airstreams....so little time...
WBCCI #XXXX AIR #2495
Why are we in this basket...and where are we going
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01-06-2007, 08:13 AM
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#12
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Rivet Master
1956 22' Flying Cloud
1953 32' Liner
1955 22' Safari
Valley View
, Texas
Join Date: Jan 2006
Posts: 3,971
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for what its worth...
I had similar symptoms with my ex-2001 PSD. I had used the truck in the pastures during hay cut/bale/ delivery summer season. The air filter was jammed closed with hay debris...as indicated by the airflow gadget on the filter box...something I did not know about 'till pointed out by the mech who showed me, changed the air filter and solved the problem. The air filter had closed off in about 1200 miles of work and did not make it to the 3000 mile service I usually do. I had changed both fuel filters with no effect. Note...I said both filters. Good luck!
Edit....I noticed the above note on tranny problems. I went through two PSD trannys with very similar symptoms. Am now a Duramax owner.
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01-06-2007, 08:13 AM
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#13
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4 Rivet Member
2004 30' Classic Slideout
Between Here
, And There
Join Date: Feb 2005
Posts: 379
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I have a 2005 Silverado Duramax/Allison and believe the fuel filter should be the first thing to check. However there have been several recent articles about the algae growth for those who have been using bio-diesel. Those fuels made with blends of recycled cooking oils etc.
In the past algae/microbe growth in jet aircraft was a common problem. There is a product called BioBor, usually about $10 for 8oz which will prevent the problem.
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01-06-2007, 08:22 AM
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#14
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Rivet Master
1986 25' Sovereign
Southern Middle
, Tennessee
Join Date: Mar 2002
Posts: 3,319
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Stanadyne Corporation has products which have been the standard for the trucking industry for years. Check out their site: Stanadyne Corporation - Home Of High Quality Diesel Fuel System Components
__________________
Craig
AIR #0078
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system
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01-06-2007, 08:55 AM
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#15
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Rivet Master
2006 30' Classic
Farmington
, New Mexico
Join Date: Feb 2005
Posts: 826
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Change fuel filter --check air filter--if this doesn't correct the problem take it to a professional ----guessing fixes nothing.---pieman
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01-06-2007, 11:11 AM
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#16
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Rivet Master
1984 31' Excella
Abernathy
, Texas
Join Date: Jun 2002
Posts: 865
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Truck is going to Frank Brown GMC, Lubbock TX- on Monday for a fuel filter, tranny service, and I am going to tell them about it laying down so they can check to see if it is throwing codes.
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01-06-2007, 11:22 AM
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#17
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Rivet Master
2006 28' Safari SE
Currently Looking...
Colorado Springs
, Colorado
Join Date: Jun 2003
Posts: 703
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Check The Diesel Page (TDP) forum first
David,
I've been a member of this Duramax Forum for several years. These guys know it all.
Good Luck,
Ken
__________________
4CU Charter Member
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01-08-2007, 09:53 AM
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#18
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4 Rivet Member
1990 32' Excella
jonesboro
, Arkansas
Join Date: Aug 2002
Posts: 257
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loss of power
I rec'd a notice from GM on my 03 duramax. It said there had been problems with power loss due to fuel injection problems.It was not a recall but said the problem would be fixed for free if it happened for up to 7 years or 200,000 miles. So check with your dealer before anyone else touches it due to warranty issues.Good luck
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01-08-2007, 10:11 AM
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#19
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Rivet Master
Elgin
, Texas
Join Date: Jan 2004
Posts: 800
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David,
I had a similar situation to yours a couple of years ago (resulted in a long LONG trip home from camping). Changed the fuel filter, ran about 20,000 miles with 3 tanks of B99 scattered throughout (this was summer), changed the filter again, and haven't had any additional problems at all. Make sure when you replace the filter that you don't damage the O-rings and that they seat properly on the filter head. More than dirty fuel I suspected air leaking in somewhere around the filter head. Since I've had two more filter changes since then, and no additional problems.
__________________
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01-08-2007, 01:59 PM
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#20
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4 Rivet Member
1977 24' Argosy 24
Inverness
, Florida
Join Date: May 2006
Posts: 264
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hello if it winds out in 1st 2nd 3rd but not shift to 4th I would look atthe tranny first. it's not starving for fuel in 1 ,2 or 3 then it must be a tranny problem.just my thought.
Bob
__________________
just want to camp happy
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