High ltft under load

Author: lhpc

August undefined, 2024

WebUNDER LOAD ( HIGHWAY SPEED) CAL 2.7 ECT 194 MAP15 INHG RPM 2052 SPEED 66 PER SCAN TOOL 71MPH SPEEDO SPARK ADV 38 IAT 79 DEGREES MAF 5.28 LB/MIN TPS 10.2 … WebJul 10, 2024 · Normally, both LTFT and STFT should be close to zero. If the STFT rises higher than plus 15-20% at idle, but drops at higher rpms, most likely you have a vacuum …

LTFT vs LT Adaptation of mixture formation Ross-Tech Forums

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 … 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. great falls montana holiday inn express

Mass Air Flow Sensor AF10043 689604153185 eBay

WebDec 4, 2024 · LTFT at 2500rpm no load, +%4. Driving under load, LTFT is at most + %2-3 O2 sensor voltage appears correct. Upstream cycles .9 to .1 volts about every 1.5 seconds. … Web-k&n high flow filter with airbox cover off So using an ELM327 I was just looking around at different pids just so that I can keep an eye on the car, and so when I do get an AP I'm used to the values and my LTFT comes up as +13% at idle, then drops to +2% under higher load and cruising at about +7%. WebThe LTFT stored value in memory can be reset using a bi-directional scan tool or on some vehicles by removing the battery power for 15 minutes. LTFT and STFT are percentages which represent the adjustment to the fuel injector pulse width. The LTFT and STFT are added together, so a LTFT of 10% and a STFT of -5% will equal 5%. great falls montana high school

Long-Term & Short-Term Fuel Trim - General Technologies Corp.

Question about high LTFT% and a possible vacuum leak : FocusST - Reddit

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) WebSep 16, 2010 · Under load the LTFT values drop to between 5 and 7. I did a quick check for intake leaks by introducing propane (from an unlit torch) around the outside of the intake ducting and manifold and did not notice any change in the STFT values. I will do a detailed check of the intake sometime. Anything else I should be checking? gathermewool great falls montana homeless shelterWebJan 31, 2024 · Fuel pressure remains between 52-55.5 psi between Idle and under load. Vacuum leaks were checked for in the following manner. Watching LTFT and STFT and then upstream O2 sensors using propane all along each and every vacuum line as well as IMT valves and idle control valve, brake booster and EVAP canister. flip up armrests

"WebAug 24, 2024 · LTFT now ranges between 11% and 20% at idle. It hangs around 10% under revving and 4-7% under load; this has not changed since before the repairs that have been … " - High ltft under load

High ltft under load

WebSep 22, 2002 · Once again more air = higher LTFT’s (more fuel) = more power…very simple. It’s “calibrated” (very poor word to use) to the range of flow inherent to the displacement of the engine. The next item was the MAFT. It was never designed to … WebApr 5, 2024 · There is no such situation as Ltft being wildly out of range and stft being in range as being healthy. The LTFTs should be +/- 2.0, and you get codes at around 11-12%. …

Did you know?

WebDec 16, 2024 · That’s why you might get leaner stft and ltft under load. and it still be a leak between MAF and turbo. these issues are very common place. ... It’s still also possible a dirty MAF sensor. I had perfect 14.7 at light load almost 0 trims but way lean at high load. You didn’t change anything that could effect the volumetric efficiency ... 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 …

WebAug 27, 2024 · At this point literally nothing I do seems to have any effect on fuel trims, LTFT is at 18% at idle and within +/-10% under any load at all and I can't find any components … WebApr 30, 2024 · The long-term fuel trims (LTFT) are driven by the short-term fuel trims. LTFT refers to changes in STFT but averaged over a longer period of time. A negative fuel trim percentage indicates a taking away of fuel while a positive percentage indicates an …

Jan 31, 2024 · WebApr 11, 2024 · Purchased this MAF sensor for my 2005 Avalanche after pulling a P0101 code. Truck was idling rough, horrible fuel mileage, boggy acceleration and would sputter while under a load, especially uphill. The Oscilloscope measurements on the OLD sensor would bounce from .5lbs/sec to 9lbs/sec at an idle with no load.

WebJan 11, 2016 · Basically the first two lines are LTFT, next two are STFT, then oxygen wideband bank 1 and bank 2 for lambdas and last one is wideband bank 2 current. The …

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. great falls montana historyWebFeb 11, 2015 · So what I've noticed on the scan gauge is my LTFT at idle is a solid 3.9. But as soon as I push on the accelerator they jump up to 14% while the STFT is right around 0 … great falls montana home depotWebApr 28, 2024 · Then it goes back to mostly normal LTFT under load? If so, that would most likely be a vacuum leak. The tiniest little leak on these cars (especially regarding the PCV system) will send these cars into hysterically lean idle or light cruise conditions. If it's just bad LTFT numbers all the time, then probably not a vacuum leak. great falls montana historical photosWebNov 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 … flip up arm gaming chairWebA significant increase in STFT and LTFT can be caused by: Unmeasured air is entering the engine due to a vacuum leak (higher fuel trim at idle, but less at higher RPMs) Incorrectly … great falls montana homes for sale truliaWebMar 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 … flip\u0027s automotive speed shop virginia mnWeb2 days ago · Female javelin coach, 26, accused of having sex with a 17-year-old boy on the high school track and field team after 'texting him at 2am and inviting him to her home' - before pair 'had a 17-month ... flip up arms office chair