Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

Engine Cuts Out At Higher RPM

Thread Tools
 
Search this Thread
 
Old Jan 16, 2010 | 11:06 PM
  #1  
cfarley0210's Avatar
Thread Starter
|
Diesel Enthusiast
Joined: Jan 2010
Posts: 287
Likes: 8
From: oregon
Default Engine Cuts Out At Higher RPM

i have a 2002 chev with a six speed manual transmission when i am getting into it in fifth gear it starts to cut out about 500 rpm before it gets to the revlimiter but in all the other gears it doesnt do it. it almost feels like its running out of fuel it surges and wont go any faster until i shift a gear. i had a similiar problem earlier but it was at around 2000 rpm in all the gears, that ended up being a plugged fuel filter. that was about 7 months ago. also would i be able to notice if i have a bad injector? it just doesnt feel like it has the power it used to, and it doesnt smoke unless i have my chip turned up which would be my first sign of a bad injector.
 
Reply
Old Jan 17, 2010 | 06:48 AM
  #2  
2500HeavyDuty's Avatar
Super Moderator
Joined: Oct 2007
Posts: 14,872
Likes: 764
From: Houston, Tx
Default

What rpms and speed does this happen at? the stock speed limiter is at 98ish MPH
 
Reply
Old Jan 17, 2010 | 11:34 AM
  #3  
cfarley0210's Avatar
Thread Starter
|
Diesel Enthusiast
Joined: Jan 2010
Posts: 287
Likes: 8
From: oregon
Default

its at about 2700 rpm and probably 65 mph
 
Reply
Old Jan 17, 2010 | 11:41 AM
  #4  
2500HeavyDuty's Avatar
Super Moderator
Joined: Oct 2007
Posts: 14,872
Likes: 764
From: Houston, Tx
Default

Originally Posted by cfarley0210
its at about 2700 rpm and probably 65 mph

well if it was in 5th gear like your said in your original post, 2700rpms in 5th gear would give you ~94 mph which is around the fuel cut off speed and it wont go any faster if your truck is stock

thats where your surging feeling comes from cause when it hits the speed limiter the fuel will cut off and when the speed drops down it will fuel again causing your truck to jerk around.
 
Reply
Old Jan 17, 2010 | 02:52 PM
  #5  
cfarley0210's Avatar
Thread Starter
|
Diesel Enthusiast
Joined: Jan 2010
Posts: 287
Likes: 8
From: oregon
Default

no its a six speed manual transmission. fifth tops out at about 70's. i have a juice w/additude, cold air intake, ppe valve, straight exhaust.
 
Reply
Old Jan 17, 2010 | 02:59 PM
  #6  
2500HeavyDuty's Avatar
Super Moderator
Joined: Oct 2007
Posts: 14,872
Likes: 764
From: Houston, Tx
Default

when was the list time the filter was changed?
 
Reply
Old Jan 17, 2010 | 03:12 PM
  #7  
captain_stabbin's Avatar
Diesel Wrench
Joined: Aug 2009
Posts: 919
Likes: 27
From: houston, tx
Default

hmmm is it throwing a code? and is this with the juice on or off?
 
Reply
Old Jan 17, 2010 | 03:55 PM
  #8  
cfarley0210's Avatar
Thread Starter
|
Diesel Enthusiast
Joined: Jan 2010
Posts: 287
Likes: 8
From: oregon
Default

it was changed about 7 months ago. no codes are thrown. juice is on milage mode. its weird because it will only do it in fifth gear but the rest of them i can hit the rev limiter with. i am not sure about sixth i have not topped my truck out yet.
 
Reply
Old Jan 17, 2010 | 04:06 PM
  #9  
12vcummins96's Avatar
Administrator

Joined: Aug 2009
Posts: 5,765
Likes: 340
From: Pearland Tx
Default

try it with the juice off
 
Reply
Old Jan 17, 2010 | 05:36 PM
  #10  
2500HeavyDuty's Avatar
Super Moderator
Joined: Oct 2007
Posts: 14,872
Likes: 764
From: Houston, Tx
Default

7 months on a filter
 
Reply



All times are GMT -5. The time now is 02:48 AM.