GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

Fuel mileage fix

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Old Oct 16, 2019 | 01:40 PM
  #41  
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and according to the OP, it was doing this before the tune.
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Old Oct 16, 2019 | 05:50 PM
  #42  
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All the more reason for me to believe it's getting what it's gonna get
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Old Oct 16, 2019 | 07:27 PM
  #43  
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A guy posted about his front diff getting stuck. Not exactly sure what his differential issue was, but try pulling the front driveshaft and see if there’s a mileage gain.
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Old Oct 16, 2019 | 07:31 PM
  #44  
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Originally Posted by ReallySatisfies
Update: figured out my front diff was stuck, gave it a bit of a workout, and now drives better, got it up to 14mpg. Still not impressive, but I ordered black bear's data logger tune and just put a volant on today (sounds mean!). My cats tested great.

New issue started a few days ago, feels like it's randomly losing fuel pressure. Whether just accelerating from a light to 30, or getting on the freeway, it feels like I'm back and forth on the gas pedal. Really annoying, idles fine, starts fine. Any ideas???

Here it is
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Old Oct 18, 2019 | 05:27 AM
  #45  
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Originally Posted by Beatdown Z
A guy posted about his front diff getting stuck. Not exactly sure what his differential issue was, but try pulling the front driveshaft and see if there’s a mileage gain.
Front diff isnl unlocked
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Old Oct 18, 2019 | 08:18 PM
  #46  
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I noticed I have a very bad motor mount, motor is hanging about an inch and a half low in the front, that wouldnt cause a noticable drop in mpg would.it, I mean because of the new driveline angle?
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Old Oct 19, 2019 | 02:04 AM
  #47  
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Originally Posted by Project.rado1500
I noticed I have a very bad motor mount, motor is hanging about an inch and a half low in the front, that wouldnt cause a noticable drop in mpg would.it, I mean because of the new driveline angle?
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