LB7 Performance Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines Related To Performance And Longevity

2003 LB7 no power after mid throttle

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Old May 12, 2014 | 11:44 PM
  #11  
4x4manonbroke's Avatar
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Can you scan to check to make sure the ECM is verifying TPS signal ?
 
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Old May 13, 2014 | 02:08 PM
  #12  
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Pipes wont collapse if engine is reved stationary , engine needs to be under load as when accelerating hard up hill onto a highway on ramp . Believe me this is not a wind up it has happened to me on a Vauxhall Frontera and now a Dodge Journey ,for an hours work why not try it just put a short length of drain pipe into the induction pipe at the softest point .
 
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Old May 13, 2014 | 02:28 PM
  #13  
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Wow, that irritating.... I hate those mystery repairs...
 
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Old Jun 2, 2014 | 10:49 AM
  #14  
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Burnt/slipping clutches will cause a code and likely put it into limp home mode (P0700 & CEL)- not likely that

TPS errors should cause a code (P2122 to P2140) and probably limp home mode - not likely that

Clogged fuel filter or kinked/collapsed fuel line should set code (P1093 or P0087) and CEL

clogged air filter or supply makes sense on paper but seems unlikely to me. check the filter minder. will be in the red long before the vacuum pressure gets high enough to collapse the intake ducting

try unplugging the MAF sensor and see if it behaves the same
 
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Old Jun 6, 2014 | 10:47 PM
  #15  
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Seems like all good thigs to look for .. My son wants me to get a D-max truck ... LOL.

I had to explain the cost of the newer trucks .. HAhahaha .. Kids .. gotta lovem'
 
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Old Nov 28, 2015 | 10:27 PM
  #16  
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Hello
Did you ever resolve issue with truck.
Thanks
 
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Old Aug 21, 2017 | 02:58 AM
  #17  
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Did you ever resolve your issue running into same thing but is 2000 rpms
 
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