Hey guys and gals,
Just wondering if any of you have one of the new GM 5.3L vortec pickups? I traded a few months back from a 2000 5.3L to a 2004 5.3L vortec. My old truck got about 16MPG around town and 18.5-19.5MPG on the hghway, but my new truck is not getting close to that. Last tank was 13.5MPG with a mix of around town and one 50 mile road trip. On straight highway it is getting 16.5MPG on a good day.
I thought that it might get a little better after the ECU did some learning and self tuning and the drive trane ran in for a couple thousand miles. It has almost 15k on it now and mileage is stick sucking hind ***.
The only thing that I can think would cause a problem like that would be an O2 sensor with an inaccurate crossover voltage causing idle and cruise to run richer than it should. I am thinking about making the dealership take a look at it, but I need some ammo. Anybody have any ideas?
Chris
Just wondering if any of you have one of the new GM 5.3L vortec pickups? I traded a few months back from a 2000 5.3L to a 2004 5.3L vortec. My old truck got about 16MPG around town and 18.5-19.5MPG on the hghway, but my new truck is not getting close to that. Last tank was 13.5MPG with a mix of around town and one 50 mile road trip. On straight highway it is getting 16.5MPG on a good day.
I thought that it might get a little better after the ECU did some learning and self tuning and the drive trane ran in for a couple thousand miles. It has almost 15k on it now and mileage is stick sucking hind ***.
The only thing that I can think would cause a problem like that would be an O2 sensor with an inaccurate crossover voltage causing idle and cruise to run richer than it should. I am thinking about making the dealership take a look at it, but I need some ammo. Anybody have any ideas?
Chris