Feb 13, 2020 My only concern is that the long term fuel trim hovers at about - 8% at idle. This is my first subaru and I was wondering if this is normal? Do your 

Short-term fuel trim refers to dynamic or instantaneous adjustments. that the accumulation of liquids is detected at normal angles of trim and heel, and shall which it is no longer watertight, taking into account trim and heel resulting from the 

This adjustment allows you to see how much of a correction was made to the mixture. It is stored in the DME when the key is turned off, when the engine is restarted, long term begins where it left off. When using long term to diagnose a fuel trim fault. 2011-08-18 In addition to these no-load checks, drive the vehicle at various steady load conditions and watch for fuel trim variation.

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Ideally, long-term fuel trims should be at, or close to 0% when the engine is running at a steady speed. However, while changes to the engine speed will (and must) produce changes in the long-term fuel trim value, this value should return to … 2021-01-26 2018-07-21 A normal long term fuel trim reading will appear to stay the same, giving a long term average of fuel added. It, too, should be close to zero, positive or negative single digits under normal circumstances. It will fluctuate much slower, possibly appearing static. Normal STFT Reading Normal Fuel Trim - Close To Zero Adjustment LTFT and STFT will usually stay close to 0%, which equates to no adjustment. However as the engine wears, the adjustment will be necessary. A significant increase in STFT or LTFT from 0% means the ECU is detecting more air than expected and is adjusting fuel delivery with more fuel.

Nov 27, 2018 LTFT being positive does not 'necessarily' mean more fuel than normal is being delivered - but it COULD! Such as in the case of a vacuum leak 

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Long-term fuel trim should almost immediately begin returning to normal. It may take a few miles and/or cold-starts, but it’s a good way to watch the PCM learn the “new normal.” A faster way is to clear the codes and, along with them, the PCM’s adaptive memory.

Short-term fuel trim happens with the oxygen in the exhaust changes. This trim is monitored by the upstream exhaust sensor. When the exhaust passes the sensor, the ECU quickly adjusts the balance of the air and fuel. LTFT (long term fuel trim) should not change instantly, it is a learned response that happens over time. If the STFT stays consistently negative or positive for a long period of time. That will show up in the LTFT. If the LTFT is negative, it means the ECU has been reducing fuel to maintain an ideal fuel mix.

You're signed out. Long-term fuel trim should almost immediately begin returning to normal. It may take a few miles and/or cold-starts, but it’s a good way to watch the PCM learn the “new normal.” A faster way is to clear the codes and, along with them, the PCM’s adaptive memory. 2020-09-17 oxygen, it has to add fuel to burn that extra oxygen. Short Term trim is just that, short term. If the ECM sees it has to keep adding fuel for a period of time, it basically assumes that is the new “normal” and increments the Long Term trim by that amount.
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A positive number tells you it's adding fuel. Since the trouble codes indicate a lean condition (P0171 and P0174) on both banks of cylinders, both Long Term Fuel Trim 1 and 2 should be in their maximum positive number range as the PCM adds fuel to compensate for the perceived vacuum leak or failing sensor (whichever it may be).

Closed Loop Normal. Long Term Fuel Trim Total correction equals +3%. 11--66--55--44--33--22 The firing order shows that cylinders 5 and 2 are sister cylinders.