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Vortec53

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About Vortec53

  • Rank
    New Member

Profile Information

  • Name
    Jaden
  • Location
    Indiana
  • Gender
  • Drives
    2001 GMC Sierra Regular Cab
  1. 3.0L diesel specs are here.....

    Good numbers, the trail boss needs 6.2 and 3.0TD options. Hope regular cab gets the 3.0TD too.
  2. Throttle position sensor maybe
  3. I have a 2001 GMC Sierra with the 5.3 Vortec with about 211K miles. Over the past 5 months or so I've noticed the MPGs have TANKED. Be aware this is a Regular Cab 2WD! Early spring last year I was getting about 15-16 MPG with 75% hilly-city driving. Summer came around, I was still receiving 15-16 MPG. As of today, on my last fill-up I averaged 13.4 MPG. Previous two fill-ups were in the ~14.5 range. I very rarely pass the 2000RPM rev-range. I have a code that pops up every once in a while for a Downstream O2 sensor. I have a pending code for a UPstream O2 sensor. I've heard the Upstream sensors have a large play on MPG? Trucks rear end fluid, engine oil, and transmission fluid were changed May 2018. I also cleaned my Air Filter, MAF and Throttle Body about two days ago to attempt a quick fix. Any tips will help. Things I've also tried: Seafoam (2 weeks ago) runs wayyy better Marvel's mystery oil (mid-summer) did not change at thing...
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