From the Toyota repair manual: "If the total of the short-term fuel trim value and long-term fuel trim value is between +33 % and -30 % (engine coolant temperature is more than 75C (167F)), the system is functioning normally." A positive fuel trim value means that the system is being made lean by the trim value.

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on bank 1 while bank 2 is closer to 26%, I'm assuming this isn't normal. If not Apr 13, 2005 Computer Diagnostics and Tuning - my long term fuel trim jumps (normal)? - should long term fuel trim jump around? i scanned the car Oct 19, 2011 A worn out O2 sensor beyond (say) 150k miles is a possibility. A fuel pressure test would help here.

Changed front O2 sensor. Long Term Fuel Trim (LTFT) -- The correction factor (percentage) being used by the fuel control system in both open and closed loop modes of operation. LTFT should typically be within plus or minus five. Positive LTFT numbers indicate the PCM is adding more fuel to compensate for a lean fuel condition. Scan data showed Short term maxed at 25% and long term at 0%. When engine RPM was raised (off idle) short term fuel trim dropped to a normal range.

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A normal long-term fuel trim reading will appear to stay the same, giving a If long-term fuel trim (LTFT) for bank 1 is 25% at idle, but corrects to 4% at 1,500 and 2,500 rpm, focus on factors that cause a lean condition at idle, such as a vacuum leak. If the condition exists in all rpm ranges, the cause is more likely a fuel supply issue caused by low fuel pressure, a restricted injector or a defective sensor input Fuel mass = Air mass x (short-term fuel trim x long-term fuel trim) divided by (equivalence ratio x 14.64) Understanding these terms and their relationship will help you understand how to use fuel trim data shown on a scan tool. Equivalence ratio. This is the desired air/fuel ratio, a command issued by the PCM. 1.

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

Does this look normal and do I have a vacuum leak? BTW, STFT is pretty much useless.

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Scan tool fuel trim data Unlike STFT that changes rapidly as the driver changes accelerator pedal position or the vehicle encounters a rising grade and needs more fuel to maintain speed, LTFT remains a bit more stable for each cell condition. Positive fuel trim, no air leaks, confused × Help us help you.

Hi! That noise is very normal for that engine in your P0170 Powertrain Fuel trim (bank 1) Sen körde jag även normalt ska det vara på syre mellan 0,2-0,5 och co2 14,5-15,5 mät lambda och När jag letade Termokontakten, så sitter väl egr ventil alldeles intill. Från den går det They are no longer the loud, dirty diesel of yesteryear thanks to BlueTEC.
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The short term fuel trim was oscillating between - 0.5% to - 2.0% and + 0.6% to + 2.0% fairly quickly so that was satisfactory. The long term fuel trim was set at + 12.3% and I could not get it to change to a lower setting by accelerating the engine.

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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Opppen Loop-Normal • Open loop fuel system statusOpen loop fuel system status, oxygen sensor is not being Long Term Fuel Trim Total correction equals +3%.

Long term storage (more than 3 months),storage temperature≤45°C general storage In addition, the antenna should also be kept away from the fuel tank.

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11--66--55--44--33--22 The firing order shows that cylinders 5 and 2 are sister cylinders. In this video I am going to explain how your short and long term fuel trims are calculated, than we'll try to diagnose a problem on a 2003 F150 with a 4.2L e A positive number tells you it's adding fuel.

Instead of using a range of 0 to 255, the range is now 0 to -100% and 0 to +100% Percentage Chart As the name implies, long term fuel trims usually require the vehicle to be driven for some distance in order to adapt and re-learn changes. Depending on the vehicle, it may even require a couple of hundred miles.