5.0 Coyote Fuel Trim Banks not balanced
Hi folks, I have been doing data watching and logging with Torque for about 2 years now on my past V6.
Just started today on my newer 2013 GT, I got it with about 5K miles on it traded the V6 in.
I know what short term fuel trims do. However I noticed my long term trims are not always balanced. Most times I would watch or spot check it on the smart phone bank 1 was 4 points added more fuel then bank 2. Ie 8.6 vs 4.6 or 10.5 ver 7.1 This was of course mostly at idle at stop lights as I don't look at phone and drive a manual.
With some help tonight it seems at about 2000 rpm the long term fuel trims are even about 7.7 each _+_-1 .1 like 7.7 vs 7.6
Then later at idle 8.6 bank 1 and 4.7 bank 2. This really sounds like a vacuum leak to me on bank 1, or are these Coyotes noted for this spread between banks? Car seems too new for a clogged cat, and since it clears up at sustained higher rpm that is almost classic leak is it not?
However I am guessing that I am worried about something normal with this engine that is new to me.