5.0 Coyote Fuel Trim Banks not balanced - Mustang Evolution

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Old 04-11-2014, 09:38 PM   #1
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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.

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Old 04-12-2014, 03:23 PM   #2
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So any weekend tuners/wrenchers got an idea? How about any of you that have watched your Long Term Fuel Trims, are they balanced at idle or apart like 4 or so points?

Mine only balance at or above 2000 rpm.
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Old 04-12-2014, 09:01 PM   #3
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Could be a slight mis fire on the 1 bank that is slightly more lean or just 1 plug that is ever so slightly off, had a guy with a 12 gt with 16k already showing slight mis fire counts on mode 6 data, but even at those # i wouldnt wry to much about the number difference at work usually let the trim levels go +-10 before there is something to wry about unless it staying close to the 10s all the time, trims will change due to temps, fuel, baro pressure, etc
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