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07-03-2015, 02:02 AM
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#1 |
 Drives: 2014 v6 Join Date: Nov 2013
Location: NY_LI
Posts: 395
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Fuel trims
Just a question about fuel trims and a/f ratios. On my stock tune my a/f ratio would never leave 1.0(command equalance ratio) and my short term fuel trim would vary between lean and rich like normal And my
Long term fuel trim was very steady. After my tune, ratio drops to about .81 on heavy acceleration ( which I've read places that it's normal), and on my tune my STFT switches back and forth. And so does my LTFT. At idle not to much. But more under acceleration. Are these things normal or should I have a talk with my Tuner ? |
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07-03-2015, 05:22 PM
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#2 |
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SHKE BKE
Drives: 2013 Camaro Join Date: May 2014
Location: SoCal
Posts: 3,108
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Sounds normal, though even on a stock tune the A/F Ratio sensor should have a moving voltage especially under high RPM. For instance .9 volts to 1.1 volts, but I'm talking about actual voltage not what the ECM is looking for
Fuel trims will switch between rich and lean faster when the RPM is higher and slower when it's at idle. Just look at actual fuel trims and as long as they're ok you shouldn't have a problem |
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