What does a high long term fuel trim mean?
Why are the fuel trim numbers high? If LTFT or total fuel trim is greater than plus 10%, the PCM thinks the air/fuel ratio is too lean and it’s adding fuel to bring STFT control to the correct range. This presents three possibilities: Unmeasured air is reaching the combustion chambers.
What happens if my fuel trim is too big?
If a Long-Term Fuel Trim get too large (±25%), the PCM/ECM will trigger a “MIL” warning, and set one or more Data Troubles Codes (DTC) to help diagnose the problem. The DTCs directly related to fuel trim problems are:
What should my long term fuel trim reading be?
Usually they’ll stay around positive or negative 5%, but they may occasionally go up towards 8 or 9% depending on the efficiency of the engine, age of the components, and other factors. A normal long term fuel trim reading will appear to stay the same, giving a long term average of fuel added.
Where are the components in a Kia Sorento?
Variable Intake Solenoid (VIS) Valve 23. Fuel Pressure Control Valve 24. Canister Close Valve (CCV) 25. Ignition Coil 26. Main Relay 27. Fuel Pump Relay 28. Data Link Connector (DLC) [16-Pin] 29. Multi-Purpose Check Connector [20-Pin] 1. Engine Control Module (ECM) 2. Manifold Absolute Pressure Sensor (MAPS) 3. Intake Air Temperature Sensor (IATS)
What kind of fault code does fuel trim have?
Some of the most common Fault Codes (DTC’s) pertain to fuel trim (rich mixture, lean mixture, etc.) Here is an explanation of fuel trim and what it does for us.
What happens when the fuel pump goes out on a Kia Sorento?
There are physical signs that you can feel when your Sorento’s fuel pump is going out. Before taking anything apart, check to see if your engine’s computer has any trouble codes saved in it. The engine may throw a P0087 trouble code. This trouble code detects that the fuel rail/system pressure is too low.
Variable Intake Solenoid (VIS) Valve 23. Fuel Pressure Control Valve 24. Canister Close Valve (CCV) 25. Ignition Coil 26. Main Relay 27. Fuel Pump Relay 28. Data Link Connector (DLC) [16-Pin] 29. Multi-Purpose Check Connector [20-Pin] 1. Engine Control Module (ECM) 2. Manifold Absolute Pressure Sensor (MAPS) 3. Intake Air Temperature Sensor (IATS)
What do long and short term fuel trim tell you?
Long and short-term fuel trim are very useful indicators of engine performance relative to the manufacturer’s specifications, but before we get into what they tell you, we’ll go over what they are. What is Fuel Trim?
What should fuel trim correction be for lean running engine?
The manufacturer selects a level of fuel trim correction (in this case, a positive percentage) beyond which a code will be set. Depending on the details, this level may be as low as 20% or as high as 50%. Again, depending on the details]