Sudden drop in mpg
Thread Starter
Racer
Joined: Feb 2012
Posts: 254
Likes: 0
From: Morrisville NC
Sudden drop in mpg
I have a 2010 LS3 with an LS7 manifold-exhaust back
My car went from 30+ mpg to 26 mpg recently. Im suspecting the tune, MAF and O2 sensors. I just picked up HP Tuners. Can you guys teach me the basics to track down whats causing the parasitic loss in fuel economy?
My car went from 30+ mpg to 26 mpg recently. Im suspecting the tune, MAF and O2 sensors. I just picked up HP Tuners. Can you guys teach me the basics to track down whats causing the parasitic loss in fuel economy?
Thread Starter
Racer
Joined: Feb 2012
Posts: 254
Likes: 0
From: Morrisville NC
@Boomer111
Does this sound like the HB causing all of this? Right now it sounds like a cricket at idle and it wobbles pretty bad. Did I save my AC compressor?
Is the LS3 crank pinned or do I need a speed shop to pin it for the ATI?
Does this sound like the HB causing all of this? Right now it sounds like a cricket at idle and it wobbles pretty bad. Did I save my AC compressor?
Is the LS3 crank pinned or do I need a speed shop to pin it for the ATI?
Last edited by justdrive; Oct 9, 2016 at 09:41 PM.
Racer
Joined: Jul 2015
Posts: 404
Likes: 35
If it's wobbling bad, I would get that replaced ASAP. I've read somewhere on here where a guy trashed his crank from a wobbling HB. Not sure if it's possible/true. No the crank does not need to be pinned for the ATI dampener.
Melting Slicks
Joined: Jan 2001
Posts: 2,022
Likes: 194
From: palm harbor/murphy Fl/NC
C6 of Year Finalist (performance mods) 2019
St. Jude Donor '11, '14
I would go and have the computer read. See if any codes have been set.
The 0'2 would set off that engine sign on dash.
I have never seen 30mph though? I think that 26 ish is normal with the cruise on.
The 0'2 would set off that engine sign on dash.
I have never seen 30mph though? I think that 26 ish is normal with the cruise on.
