Oxygen Sensors show the level of oxygen in the exhaust stream before and after the catalytic converter. These are probably two good places to start looking if your OBD2 scanner reports strange idle RPM values. If your RPM is falling outside these ranges, then it’s probably down to an issue with a faulty or carboned idle control valve or electronic throttle body, or a vacuum leak. For cars, idle speed is usually between 6rpm, whild for trucks its around 600, and motorbikes are higher at between 12rpm. Unless you’re touching the throttle, this will be the engine’s idle RPM, which is what we want to check. Live data will also show your engine’s RPM.
Either way, that high of a fuel trim means you should be looking for the underlying problem. Or, the computer is trying to compensate for lower than normal fuel pressure. like +25%, you may have a vacuum leak which is causing the computer to add more fuel. Readings outside of these ranges are an indication of engine or fuel system problems. Normal STFT values shift between -10.0% and 10.0%, while normal LTFT usually run between -5.0% and 5.0%.
If short term fuel trim stay the same for a long period, the computer shifts them into long term fuel trim area. Fuel trims are also shown as Short Term Fuel Trim (STFT) and a Long Term Fuel Trim (LTFT). However, this is rarely the case.Ī reading that is above 0.0%, so a positive number, means more fuel is being added to the air/fuel mixture mixture, while a negative number means the computer is subtracting fuel from the mixture. A reading of 0.0% would suggest the fuel system is working perfectly that the correct amount of fuel is being released. Fuel trim refers to how much fuel is being released into the engine by the fuel delivery system.
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