Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech
GL4x4 Live! GL4x4 Casino







Search
Reply
 
Thread Tools
Old October 1st, 2009, 06:30 AM   #1
distant75
Senior Member
 
distant75's Avatar
 
Join Date: 09-29-06
Location: Utica, MI
Posts: 804
iTrader: (27)
The diesel shutter

My 04.5 GMC has a shutter, miss of some sort or slipping at about 55mph light load. The powertrain is a Duramax LLy backed by an Allison trans with 75,000 miles on the truck. If I tip into the pedal it will stop shuttering and when I back out of the pedal it will start to do it again. It is an intermittent problem. The last time this happened was about a month ago and it only happens when I'm on 59 heading west in the morning.

Any pointers or suggestions would be appreciated.
Thanks
__________________
The baddest mini Jeep around

www.banishedcreations.com Yes its a work in progress.
distant75 is offline   Reply With Quote
Old October 1st, 2009, 06:43 AM   #2
IFS SUCKS
I like trees
 
IFS SUCKS's Avatar
 
Join Date: 09-20-07
Location: Lansing,MI
Posts: 5,797
iTrader: (6)
Check engine light on?
IFS SUCKS is offline   Reply With Quote
Old October 1st, 2009, 07:28 AM   #3
95geo
newbie
 
95geo's Avatar
 
Join Date: 11-05-05
Location: dryden
Posts: 5,774
iTrader: (6)
Mine kind of pulses every now and then. it's like an out of balance tire but a lot slower. I almost think it's related to drivetrain wind up and the compliance in all the rubber bushings. It's done it since it was new but it has gotten worse. If you ever figure out what it is I'd be interested in knowing what is causing it.
95geo is offline   Reply With Quote
Old October 1st, 2009, 07:30 AM   #4
95geo
newbie
 
95geo's Avatar
 
Join Date: 11-05-05
Location: dryden
Posts: 5,774
iTrader: (6)
Does it do it in tow/haul? do you have a stock trans and converter? it could be your converter clutch slipping when the line pressure is low? I havent looked at the schematic for the allison in a long time so I'm not sure what happens to the line pressure at the converter in different conditions but I'm just guessing.

ask around on thedieselplace.com I'm sure those guys have everything nailed down by now.
95geo is offline   Reply With Quote
Old October 1st, 2009, 07:20 PM   #5
distant75
Senior Member
 
distant75's Avatar
 
Join Date: 09-29-06
Location: Utica, MI
Posts: 804
iTrader: (27)
Quote:
Originally Posted by 95geo View Post
Does it do it in tow/haul? do you have a stock trans and converter? it could be your converter clutch slipping when the line pressure is low? I havent looked at the schematic for the allison in a long time so I'm not sure what happens to the line pressure at the converter in different conditions but I'm just guessing.

ask around on thedieselplace.com I'm sure those guys have everything nailed down by now.
Very possible about the converter it only does it in over drive. The trans is stock.

Quote:
Originally Posted by IFS SUCKS View Post
Check engine light on?
No check engine light. Even when the EGR sticks no light comes on.
__________________
The baddest mini Jeep around

www.banishedcreations.com Yes its a work in progress.
distant75 is offline   Reply With Quote
Old October 1st, 2009, 09:15 PM   #6
pitbull2332
Senior Member
 
pitbull2332's Avatar
 
Join Date: 02-02-09
Location: scotts,mi
Posts: 1,165
iTrader: (28)
My 06 2500 with the lbz did the same thing from the factory. Told the dealer about it, There was a bulliton on this and they reflashed the ecm and the shudder was gone. The transmission would not downshift out of sixth right away. Felt like a manual trans in a too high of a gear. Your 5 speed allison might be a little different, But sounds like the same problem. Just my 2 cents
pitbull2332 is offline   Reply With Quote
Old October 1st, 2009, 11:06 PM   #7
boggin-machine
Senior Member
 
boggin-machine's Avatar
 
Join Date: 01-11-06
Location: bay city
Posts: 11,627
iTrader: (31)
mine does the same thing. it also revs up when its sittin there idling or at a stop light. ive been told it has something to do with the a/c
__________________
08 qcsb Duramax Ltz
02 tj with some parts laying around **for sale**
08 crf 450 with a few goodies
boggin-machine is offline   Reply With Quote
Old November 15th, 2009, 08:08 PM   #8
distant75
Senior Member
 
distant75's Avatar
 
Join Date: 09-29-06
Location: Utica, MI
Posts: 804
iTrader: (27)
Fixed, fuel filter ended up being the problem.
__________________
The baddest mini Jeep around

www.banishedcreations.com Yes its a work in progress.
distant75 is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -5. The time now is 07:02 PM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
Copyright 2005 - 2012 Cracker Enterprises - Powered by Linux
vB Ad Management by =RedTyger=
Page generated in 0.12959 seconds with 26 queries