eej711
Sun, June 19th, 2011, 09:08 PM
I am curious to know what my air/fuel ratio is since I have made an intake modification. Is there a way to calculate it using the records the gryphon programmer with record or just simply any way of calculating it?
cleatus12r
Sun, June 19th, 2011, 09:48 PM
It's always going to be around 14.64:1 unless you're in open loop (near WOT) or the PCM isn't able to correct anymore for a severe lean or rich condition.
eej711
Sun, June 19th, 2011, 10:34 PM
That is why i want to calculate my ratio, to make sure it is right around 14.64:1 and something isn't wrong and my truck running too lean.
cleatus12r
Mon, June 20th, 2011, 09:14 AM
If your truck is running TOO lean, your truck will set lean codes and turn on the check engine light. The PCM is able to correct up to about 40-50% plus or minus (short term and long term combined) on the injector pulse width to correct for lean and rich conditions. Once the PCM begins to correct more than 15%-18%, you will get a check engine light.
If you want to see how much your air/fuel ratio is being corrected, you'll have to look at the long-term and short-term fuel trim correction data. If the LT fuel trim is within 10% (and ST is stabilized at 0-2%), then there's nothing to worry about.
Basic answer, if your check engine light isn't on and you're not experiencing surging, hesitation, detonation, etc., your A/F ratio is 14.64:1