High ltft under load
WebAug 11, 2024 · Your LTFT is high to maintain the proper air/fuel ratio. Your STFT is swinging back and forth as it should. Your code is from adding excess fuel shown in the LTFT. If the STFT stayed low, the cat wouldn't light off, if it stayed high, the cat would get too hot, it … At the time I was using this on the 'wide open engine" it occurred to me that since … Filters arrived, have to go back under the TB. movietvet; Jan 18, 2024; Replies 23 … WebMay 27, 2024 · High O2 voltage paired with high LTFT reading. What is likely culprit when O2 pegs at .9 volts and stays there indicating engine is rich. Then as this continues for 15 - 30 …
High ltft under load
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WebFeb 11, 2015 · 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. WebMar 18, 2024 · positive LTFT on Idle. Have a quick question and wondering on some thoughts. Just swapped a 5.3L in a 91 Jeep for a guy, got it up and running but I have super high fuel trims when idling. (like +25). When I unplug the MAF the LTFTs come to a normal level +/- 5. Swaped out the maf and same thing. he didn't want to put new 02 sensors in so …
WebFeb 26, 2015 · High trim at idle but not so much at speed is a vacuum leak. Good fuel trims at idle but high while driving is poor fuel delivery. Pump, filter, restricted fuel line. If the pump is weak it may still make spec pressure when their is no load on it, but the engine will go lean when under load driving. I'm not old, I'm ripe - My LS Jeep project Save WebNov 23, 2024 · Both LTFT and STFT can be positive (more fuel) or negative (less fuel) percentages. LTFT and STFT are added together to produce the total fuel trim, and neither should exceed ± 10% in normal operating conditions. Fuel trims (LTFT, STFT, or LTFT+STFT) exceeding ±10% may indicate a problem in the engine or the sensors.
WebOct 17, 2024 · Thread: Help diagnose / troubleshoot '10 2.0T 2k rpm surging, High LTFT,engine brake ticking. Thread Tools. Show Printable Version; 09-12-2024 01:52 PM #1. markcm. View Profile ... the rpm will pulse by about 1-200 while holding a steady foot or using cruise control and the car is under a consistent load such as a hill climb. … WebJun 30, 2024 · LTFT was at 11.4% STFT was at 4% MAF 2.8 warm 3.8 cold changed oil, and replaced homemade CAI with stock air box and replaced in-cabin air filter STFT shot up to 27.3% and LTFT hangs out around 30% immediately after doing above maintenance. Noticed huge hole in upper air boot (I probably made it bigger, when replacing CAI with Stock)
WebThere will be upwards of 20-30 different LTFT load cells stored for various speed and load ranges. These will change in scan data as you move the engine through its power ranges. The values will return to normal after repairs are complete. Each load cell has to be used long enough for the STFT to modify the LTFT in that cell.
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