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O4 Cummins lope at idle

Old Mar 2, 2026 | 08:22 AM
  #61  
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Originally Posted by Goshdarnram
Oh okay makes sense I will get it checked out absolutely, I'm starting to believe it has to be an injector issue, truck runs fine when warm I would just rather find the issue before something negative happens
its not a fool proof theory but if you're not hazing smoke or anything when warm, the possibility of damage is minimal
 
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Old Mar 7, 2026 | 09:49 AM
  #62  
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All tested between .4 and .6
 
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Old Mar 7, 2026 | 10:18 AM
  #63  
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Isn't that a bit low??? Aren't they supposed to be around 12 ohms or so?? (we are talking about injector resistance here, right?)
 
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Old Mar 7, 2026 | 10:57 AM
  #64  
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From what I've read anything lower the 1.0ohm is good to go truck was off when doing readings
 
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Old Mar 7, 2026 | 11:02 AM
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I just took the cover off and probed the 2 prongs on the injectors them selfs for some reason there was oil in the plug ins to the injectors not sure if that's normal or not but did notice that

Today it didn't lope wonder if it's because it's like 80
 

Last edited by Goshdarnram; Mar 7, 2026 at 04:22 PM.
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Old Apr 9, 2026 | 03:41 AM
  #66  
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Default Anyway this could be the culprit oil in connecters on all 3


 
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Old Apr 9, 2026 | 08:02 AM
  #67  
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I wouldn't be overly concerned buy it, new injector harness wouldn't be the worst investment though
 
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Old Apr 9, 2026 | 08:40 AM
  #68  
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It's starting to lope more even when warm and throwing a fan clutch speed code now
 
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Old Apr 9, 2026 | 09:12 AM
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The fan code may be a result of the lope......
 
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Old Apr 9, 2026 | 09:25 AM
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That's what I was reading on people saying
 
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