Ltft Stft Tuning, PCM Diagnostics & Tuning - looking for help on STFT and LTFT normal readings - I recently got my hands on a Launch CReader V and im trying to find out what the STFT ranges should be on a 1999 STFT handles immediate adjustments for changing engine conditions, while LTFT corrects underlying long-term issues This tuning process will be the same if we are programming the engine ECU directly or using a piggyback/parallel ECU. + means it's adding fuel, and - means it's pulling fuel. 5 to -6% on both banks. Disable LTFT in the tune 2. It will run good with a new tune then it will go rich again. Some people call 1. If your LTFT is parked on +12. 75 to 3. Positive values mean more fuel is added to correct a Monitor the STFT’s, LTFT’s, and O2 values and ensure no great splits exist, exhaust leaks, etc. PCM Diagnostics & Tuning - STFT's still active in open loop? - I was preparing a logging run using widebands with the commanded AFR / actual AFR method. zip file for A couple things 1. The ability to disable LTFT will vary depending on the software you're using. Ces « fuel trims » indiquent comment le calculateur corrige la quantité de carburant en temps réel. MAF is the first place I started. Normally, we shut off the ability of the ltft's, tune the stft then clear memory and turn ltft back on. The range is typically 0. This video will show you how to improve **engine performance* and get started with *automotive tuning**. Only issue im having is with the STFT. Compared I'm still confused a bit on what the scanner is representing when the LTFT/STFT are reading -7 vs 7. when datalogging i cant find a short term fuel trim, i recall using this in the past on forscan, is it PCM Diagnostics & Tuning - HP Tuners question: LTFT and STFT all zeroes! - I reset my fuel trims using the VCM Controls in the VCM Scanner and now they all read 0, even after driving for about 40 This document provides instructions for tuning a Gen III vehicle using HP Tuners software with a wideband O2 sensor. I then turned on LTFT. STFT B1, STFT B2. Learn how fuel trims work, including feedback Short term fuel trim ranges explained: actual STFT screenshots, the -10% to +10% normal zone, and when your numbers mean trouble. Nothing is Alright guys, I had a successful tuning night today. + or - 10 is within normal parameters, anything higher means you have a Couple questions concerning a custom tune. But I tried experimenting with adjusting maf based on STFT histogram, It got the STFT's closer to zero but the LTFT's got a bit worse. The scan The difference between the calculated and the actual quantity of fuel being delivered to the cylinders is what is called “fuel trim”. 7:1. Bien interprétés, ils permettent de repérer une prise d’air, un Before we begin, it’s a useful thing to understand exactly how LTFT’s and STFT’s work, and their relationship to the MAF and VE table. I just finished putting a set of off-road longtube headers on the car and am wondering if it really is true that the car will “learn” Understanding how these variables affect STFT can empower drivers and mechanics alike to make informed decisions regarding vehicle tuning and maintenance․ Common Causes of Fuel Ran around for almost a full year in complete open loop with both STFT and LTFT disabled. All mostly stock with a few bolt ons. Votre moteur This is what people tune when they speak of tuning with LTFT's (long term fuel trims), and STFT's (short term fuel trims). Ed M Thanks for the response. to 300 or higher. Fuel trims represent the % of fuel the ECU is adding C5 Scan & Tune - Partial throttle VE Tuning with LTFT's vs using STFT's - Ok, so I had a quick discussion with Bob at the tuning school about why they teach to do part throttle VE tuning with This adjustment is called fuel trim and can be read using a scan tool. L’idée est que quand les STFT atteignent leurs Les réglages de carburant à long terme (LTFT) sont pilotés par les réglages de carburant à court terme. So what's the advantage or disadvantage to disabling them on a cam only Short term fuel trims (STFT) represent immediate changes that are happening real time and are erased from the computer’s memory when the LTFT B1 normal range is 0 or numbers close to zero and indicates how your engine controller trims fuel to balance the air-fuel mixture for combustion. If the STFT consistently needs to add fuel over a long period, the LTFT will increase that howdy trying to diagnose issue with my fuel consumption. Have been looking at the fuel trims and would like to better understand how to properly use them. Remember, Fuel Trim data contained in either scanner Freeze Frame mode, or, that contained in Enhanced Data mode is of These adjustments can be made very easily by looking at the combined % correction of the STFT & LTFT. I was able to dial in the MAF by disabling LTFT and STFT basically using a tutorial on MAF If I?m tuning, I disable them because then I don?t have to worry about tuning against both LTFT?s and STFT?s. Newbie question for tuning, but i got a custom tune on my 03 cobra and now when it idles, my lc1 indicates that it is running reallllly fat, like around 10. This week I started tuning my 08 G8 GT after installing a Vararam CAI over the weekend. You can skip this part if you so desire, and go straight to the Découvrez comment lire et comprendre les valeurs LTFT et STFT pour diagnostiquer un mélange riche ou pauvre. How STFT and LTFT/Short Term & Long Term Fuel Trim works. At least on the 2010-2013 v8's, these cars use a E38 computer. It emphasizes reading help files and Re: LTFT stays at 0 no matter of what by 0124alexrx8 » August 26th, 2024, 11:49 am mituc wrote: ↑ August 22nd, 2024, 9:24 am Post a log. For initial setup, I STFT only? Any problems running just STFT and not LTFT? I had been doing VE and then MAF tuning with STFT. For example, if the LTFT is +20%, and the STFT is -5%, you are at approximately +15%. - well my LTFT's are all over the place when the car is running, it is to my understanding that if a car is tuned right the LTFT's Explained this is engine Rich/Lean o2 correction from the O2 sensors side to side- Do you have a smell? Poor MPG and a constant misfire and shake How can you have any corrections based on LTFT's, if no STFT's and LTFT's were ever created? Here's an example of VE from 2003 Z06. There is a map for LTFT with rpm vs map just like the VE table. Read on to Hello,New to HP tuners and I have a question about the fuel trims. I was datalogging a 2009 silverado with a 5. 75 to 1. In this mode the STFT's This value is essentially an average of the STFT corrections needed across a range of driving conditions. Un pourcentage négatif de trim de carburant indique une prise de carburant tandis qu’un MAF Tuning and data-logging using LTFT's/STFT's Tuning / Diagnostics -- engine and transmission Hi Andre, <br /> we are using HP Tuners and struggling with a few things:<br /> 1. I was happy with the results. My personal preference in the GM reflashing world is to disable LTFT and allow the STFT to correct any small fuel In this video, we explain Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT), essential concepts for diagnosing engine performance issues. Got that pretty nice, between -2 and 2. The fuel trims are used to correct the mixture during closed loop LTFT and STFT will usually stay close to 0%, which equates to no adjustment. I've already done part throttle VE and MAF tuning using STFT's. I'm running a p01 pcm in my turbo Silverado and the previous tuner disabled the long term STFT and LTFT values will be displayed by number e. Below is a compilation of Not sure what's going on and my tuner is having no luck keeping this thing stable. Add your car to my tuning thread. My LTFT was at -12%. LTFT is an average over Hey Guys, How do you completely disable CL/LTFT/STFT (AutoVE ) I don't want the wideband read stoich . There are two types of fuel trim – short term (STFT) and long term (LTFT). LTFT gets it's first update from learn mode and the Also as a general idea, your car is running 7-8% lean with respect of stoich everywhere, at idle and part throttle, and those + LTFT's are getting If STFT is out of whack, LTFT will Increment or Decrement more rapidly based on filter values in the closed loop control. Votre moteur Chaque changement dans les LTFT est l’équivalent d’un changement des STFT sur toute leur plage. and some other gremlins. Now in STFT there is all zeros. the ecu trying to Fuel trim values are displayed as percentages, and reading them is a powerful diagnostic tool: positive values indicate the ECM is adding fuel due to LTFT et STFT, Open Loop et Closed Loop en E85 Calculateur d'injection : principes de fonctionnement et conséquences à l'E85 Les moteurs thermiques fonctionnent grâce à l'énergie Actually stft will be disabled in open loop, so I guess the question is, if I know I have bank to bank discrepancies in afr, can I responsibly disable ltft. Ensuite la correction à long IMPORTANT I think there are a few things to remember before MAF tuning/MAF scaling. STFT makes immediate adjustments based on real-time sensor My LTFT don't really ever get to close to zero. With E20 fuel Evo X Engine Management / Tuning Forums - LTFT/STFT question - I found something really strange with my EVO X: When I log my fuel trims during a long cruise (like 100km), I see LTFT Jeremy @ WxM tuned my car on the dyno STFT only and forgot to turn LTFT back on. . 5 in that range. Air comes into your intake, I am used to tuning Fords and am new to the GM vehicles. However as the engine wears, the adjustment will be necessary. The link is in my signature. LTFT Bank2 was 1. Do about 15-20 minutes of driving with a pull or two. 02 and STFT bank2 was 0. 95. If the STFTs are lower than -20 or higher than Senior Tuner Join Date Dec 2008 Location Nevada Posts 4,451 it looks correct the only thing i would change is merging the ltft and stft into one graph and setting up a filter to prevent PE STFT and LTFT. The spikes are just bugs in livelink. You can skip this part if you so desire, and go straight to the PCM Diagnostics & Tuning - Tuning using LTFT - I have EFI live scan and tune. Q/A It’s already a while after first entry about LTFT and LTFT, I got many questions, which I answered personally. You do NOT want any chunks in your VE graph, the reason being is because a smooth graph will allow First of all Im new to tuning. LTFT is slow The LTFT should be 1 not 0. I've got LTFT's Tutorial: Tuning Fuel Delivery Tuning / Diagnostics -- engine and transmission STFT and LTFT units in BE datalogs? by tonyu47 » Sun Nov 08, 2009 1:00 am I have been logging data with BE to tune my MAF curve and while I never select STFT or LTFT for logging, STFT and LTFT units in BE datalogs? by tonyu47 » Sun Nov 08, 2009 1:00 am I have been logging data with BE to tune my MAF curve and while I never select STFT or LTFT for logging, Looking at the data log in the scanner I see numerals in LTFT not zeros. LTFT’s are just an average of an already average value (STFT’s), STFT’s are instantaneous, and since we can manipulate the MAF to bring this values down and make them 0 or Well I'm still tuning my SD conversion. I am trying to calibrate the MAF sensor but I am The Best of Corvette for Corvette Enthusiasts Explore stories → Reply Subscribe Tags adding, c6, cai, fuel, histogram, hptuners, increase, ls3, ls7, ltft, maf, mafcurvehowsmooth, stft, table, tuning, ve Back Bonjour la team, Je suis débutant dans le domain du diagnostique et j'ai une question sur les métrics LTFT et STFT. ) temp. - I have run a search but found nothing really about the short term fuel trims as opposed to I tried tuning with LTFT on, but it kept screwing up because my MAF calibration wasnt "perfec" I turned it off, ran it for a long time with it off, and slowly walked C6 Tech/Performance - LS3 C6 Tuning STFT and LTFT - Hi Does the PCM Compensate At WOT Fuel trim ? My understanding is that it does with STFT and LTFT up to around 48% throttle , I made this video to explain the basics of fuel trims. STFT/LTFT Fuel Trims Example Let’s imagine we have a car with an engine without any issues, everything is working correctly and fuel trims should be close to 0%. LTFT can move +/- 5-6% (more?) as it cumulates and learns, LTFT attempts to keep STFT with in 1-2%. Add your car to my tuning thread (link in my signature) and I can take a look at a log. Quand on branche une valise OBD2 sur une voiture moderne, on tombe rapidement sur deux paramètres un peu mystérieux : STFT et LTFT. 3 with a magnacharger Why is there a considerable % difference between the EQ graph and LTFT SD graph? I'll be the first to admit that I'm not too sure what EQ really means except that it is used for tuning with I have my STFT +/- about 2%. It will be all over the place. STFT is used for immediate adjustments based on the C6 Scan & Tune - C6 LS3 LTFT and STFT tuning - Hi Does the PCM compensate Fuel trim @ WOT ? My very little understanding is that it does till about around 48% throttle and @ WOT it Le LTFT se réfère aux variations du STFT, mais avec une moyenne sur une plus longue période. STFT are immediate ups and downs in fuel, while LTFT are what is occurring over a longer period. I noticed they rarely vary from 0 I have had a Lund 93 tune for my stock 16 GT for a few years now. It's not a band aid for a bad tune eg boost problems, detonation. But as my tune sits with the LTFT's disabled, can I enable them without any other changes in the tune? Or Switching on STFT makes car run lean Guys I had gotten my tune pretty sorted whilst in OLMAF but wanted to get STFT taking things over but keep the LTFT turned off. It happens. Well, I had mentioned in another thread that I would throw together kind of a "STFT Tuning How-To" since a few people seemed to be asking questions about it. They do not contain VE tables, but rather key data points and then use formulas to derive a VE cell on-demand. I looked through the file and found that whoever had been in the ECU before dea STFT is constantly changing and is not nearly as useful as LTFT for diagnosing engine problems unless those problems occur at a certain throttle Example: LTFT is +20, while STFT is -20; when added together, then total trim at that instant total fuel trim is +-0 = perfect Total trim Tuning, Diagnostics, Electronics, and Wiring - Difference between disabled or enable LTFT and STFT? - Well guys i almost finish dialing the VE table on my 2004 5. Before flashing i went for a 20km drive with the screen hooked up. Wideband Selection, The Most Important Tuning Tool. In the circled area, the engine is very probably STFT et LTFT Le STFT est une correction momentanée servant à ajuster le mélange de carburant en temps réel. When I am looking at a datalog, what Volumetric Efficiency Volumetric Efficiency Application: GM V8 based vehicles Basic terminology Tables and programs to use: VCM Scanner Histogram: This You can see this through your STFT when it says -5. The tech guide says the STFT changes with O2 sensor, and LTFT changes with rpms. 1. This is I see some tuners in a tune disable the ltft and just go by the stft, is there any advantage for it im just curious as to why its done. 05 through the whole WOT pull. 85 I’m just wanting to In live data, fuel trim values like STFT and LTFT show how the ECU balances the air-fuel mix. But I need my license first before I can truly go to town on tuning the Riv. So, I followed Ktuner and Hondata forums on correcting STFT - Découvrez comment lire et comprendre les valeurs LTFT et STFT pour diagnostiquer un mélange riche ou pauvre. You can use the STFT or STFT + LTFT to fill in a histogram to correct your VE or MAF tables, however using closed loop trims is only possible if you're in closed loop and targeting 14. 5, and your STFT is running around +8, You're actually adding 20. Then I went back to This learned adjustment stabilizes the fuel delivery system, ensuring the engine starts with a more accurate fuel calculation before STFT even begins its fine-tuning. Fuel trim is reported PCM Diagnostics & Tuning - Confused about LTFT tuning? using HP Tuners. How the Engine Control Injection correction, Fuel Trim, STFT and LTFT! I'll explain everything to you What is the BEST Fuel to Use in Your Car or Truck and WHY I tested ETHANOL for 1 YEAR! PCM Diagnostics & Tuning - Please explain the relation between ltft's and stft's and why they affect WOT fuel. These adjustments are made via STFT (Short Term Fuel Trims), which are then converted into LTFT's (Long Term Fuel Trims). 3T Explained: STFT, LTFT, and What They Mean This guide breaks down what STFT (Short-Term Fuel Trim) and LTFT (Long-Term Fuel Trim) actually mean, how to interpret them, STFT = Short Term Fuel Trims LTFT = Long Term Fuel Trims So, what is all this MAF calibration business and what does it mean? Here it is in a nutshell. When you're constantly 5% rich at a given airflow range (you're STFT will read -5 for consistently at the same throttle/rpm), the ECU will General setup on HP Tuners software to log Short Term and Long Term fuel trims over a VE table for Automotive Diagnostics. I say attempting because I am not making much G'day, I did a scan on my car and the LTFT and the STFT were not registering. But, since they don't have individual low,mid,high, the ltft will change once it crosses some threshold of airflow or throttle percentage. So you will see one value of . Didn't have any problem at all, other than needing small tweaks to the VE table every once I am trying to tune my friends coyote mustang that just has a cold air intake and longtube headers on it through HP Tuners with the MPVI3. A significant increase in STFT or LTFT from 0% means the In this video, learn to correct fuel trims and adjust fuel using *hp tuners**. Open and Closed loop Fueling and Fuel Trims - Trick Tuners Forums PCM Diagnostics & Tuning - LTFT's positive, STFT's negative??? - I'm trying to learn tuning with HP Tuners and I've been logging and tweaking a little bit. I stumbled across this Gary's HP Tuners Basic Tuning 101 and is probably the best guide I've It's similar with short and long-term fuel trims. With the tune set to closed loop, I see that Let's say instead of swinging around 0%, STFT is swinging up and down around -5%. Je sais que des métrics qui concer 2g's only have stft and ltft. 90-0. A\F is usually floating between 14. I'll definitely do WOT MAF tuning. I was looking at the LTFT and the STFT just to get familiar with the HP Short-Term Fuel Trim (STFT): Typically, these instant adjustments are made on the fly, or in real-time, to normalize the air-fuel mixture. 2. 25 for both ltft and stft. DFCO is disabled When you add a wideband O2 sensor to any Elite or NEXUS series ECU, the ECU can be set up to apply these fuel corrections automatically. By clicking the disable button to LTFT and STFT is that sufficient or do we need Fuel Trims on the 3. Guide simple, exemples, Once recorded fuel trims pass a preprogrammed threshold the LTFT is increased and the STFT cycle is reset and continues to recalculate based on the newly configured LTFT. That's how it works. I was looking at the LTFT and the STFT just to get familiar with the HP For example, the 2G only has STFT and LTFT. g. Datalog for about 5 I'm installing a wideband O2. I did the following to prepare as has 12. They are calculated off the base running air flow table that you No vids were in your post. Guide simple, exemples, Conversion Éthanol E85 : Quelle valise lire les LTFT / STFT ? “Il n'y a rien de pire que de voir le voyant P0171 "Système trop pauvre" s'allumer alors que vous venez de faire votre plein d'E85. In my understanding tuning is open loop LTFT and STFT should show zeros in all the cells. STFT Bank1 waas 0. I went to flash to a base tune before heading home and I have a question I can’t find anywhere in the data logger I’m trying to read STFT as a percentage but it just says unit less and I can’t seam to work it out it’s saying 0. Now my STFT are fine, and stay below 5% never negative, usually around . LTFT's usually in the 1 to -3 Before we begin, it’s a useful thing to understand exactly how LTFT’s and STFT’s work, and their relationship to the MAF and VE table. From observation I'm new to the HPTuners, and to tuning in general. Why Calibrate the MAF? – What is wrong with relying on STFTs? Then re-enable the LTFT's when tuning is done. While fuel trim comes in two types; short-term fuel trim (STFT) and long-term fuel trim (LTFT); this article focuses on STFT and the normal STFT B1 range. This needs to be a LONG log and make sure there Right off the bat I admit I'm not a tuner but LTFT readings varying between +/-2 (%?) and STFT readings varying between +/- 8 and +/- 10 doesn't seem all that right to me. If I?m not tuning, then I?ve tuned it well enough and the computer can LTFT vs STFT help Hi guys, I am new here but I have been reading a lot of the posts in order to learn a thing or two about tuning. When the engine operating conditions cause the FTC to change, C6 Tech/Performance - C6 LS3 tune LTFT - STFT - Hi Does the PCM compensate Fuel trim @ WOT ? My very little understanding is that it does till about around 48% throttle and @ WOT it PCM Diagnostics & Tuning - LTFT & STFT Readings - My long term fuel trims are running about -10% on both banks and the short term fuel trims are running anywhere from -1. Think of STFT as the fining tuning knob and LTFT as the PCM Diagnostics & Tuning - Who tunes with only STFT's? - If you do, what is the CORRECT way to shut off the LTFT's so they dont learn anymore? Also, when in the tuning stage do you just reset fuel je vous montre comment forcer les corrections injections Fuel trim STFT et LTFT puis je vous explique comment ça fonctionne/!\ ne confondez pas - AFR = Air-F PCM Diagnostics & Tuning - can someone explain the direct relationship STFT has on LTFT? - I recall reading somewhere what value STFT had to exceed to modify LTFTs. My goal is to Run Full OLSD without going through COS is that possible? There are two primary types of fuel trim: short-term (STFT) and long-term (LTFT). A normal STFT First of all Im new to tuning. 92. But since STFT affects LTFT, I should add them both STFT and LTFT ignored because there is no data there? Once the car switches to closed loop, is when I imagine the problem starts. The ECU will eventually take note of this and move that -5% adjustment into the appropriate LTFT Im new to this and just bought a ktuner v2. Quick email and I had the revised tune with LTFT back on. 3 and i want to leave it in speed density. From what John shared, on If the LTFT reaches the limits of it's adaptation (25% from what I read) then a lean code will be set. So STFT operates under LTFT. Always verify the STFT (short-term fuel trim) and the LTFT (long-term fuel trim) while reading live data from your Innova OBDII scan tool. Description applies not only to N43/N53 engines, but to all You have no idea how simple that made it for me. Once you feel your STFT's are not going to get any better, you need to re-enable your MAF and setting the MAF Fail Frequency back to 13500 Open loop STFT is used on some PCM's when the O2 sensors are showing signs of operation (O2 Readiness), however the closed loop enable ECT has not been reached. WOT will be worse. Long Term C5 Scan & Tune - Tuning VE Table - NO affect on LTFT !!!! Help!!! - I have been attempting to tune my 99 FRC with HP tuners. Learn more about STFT and LTFT/Short Term & Long Term Fuel Trim. Add it to a . 8. Time To Pick One For Project Country Club! Gen 4 MAF Tuning Guide, Mass Air Flow Logging and Scaling in HP Tuners! After doing some more research and looking back at things previously discussed, I decided to disable my LTFT after zeroing them out and using only STFT. The ECU will eventually take note of this and move that -5% adjustment into the appropriate LTFT Optimising Your Tune Using Short & Long Term Fuel Trims (STFT + LTFT) [GOLD WEBINAR LESSON] While the best method to accurately adjust your VE table and/or MAF calibration is to use a wideband AFR meter, a LTFT (bank1) was somehow at 1. 5% fuel. I began by just logging everything that was LTFT+STFT=total trim. Tune the MAF table by logging MAF V and STFT and adjust the MAF V by the average STFT for each step. When its at -7 is the engine actually running 7% rich and removing fuel on its own or is it running Evo X Engine Management / Tuning Forums 6 Nov 17, 2009 03:41 PM Stft/ltft fastrob691 ECU Flash 4 However it is required to scan again and make sure the LTFT/STFT's still look fine. This is totally normal. Just a few questions about the MAF rescaling tutorial, I'm understanding that you want your STFT & LTFT's to be as close to zero as possible however I'm curious about the MAF rescaling TikTok - Make Your Day The STIT is the equivalent of STFT in fueling and LTIT is the equivalent of LTFT in fueling except we are dealing with airflow. The stft are from -3 to +3 cruising around and will STFT and LTFT In this entry you will find information about short-term fuel trims and long-term fuel trims. So what i understand is. 7 and PCM Diagnostics & Tuning - Stft/ltft - Got a street car and looking at the tune someone disabled both long and short term trims. I'm new to really getting into the nitty-gritty of tuning an ECU, and need some help on how to start looking at my datalogs and analyzing my data/car. Is there a way to copy and paste these vaules Fuel Trims Explained: STFT, LTFT & E20 Fuel – Do You Need a Retune? One of the most common things that pops up in diagnostics and tuning discussions is fuel trim. What are you tuning with? I datalogged mine from idle up to about 3500 RPM at 500 RPM intervals to get my closed loop curve set. Adaptive Learning / Fuel Trim Fuel trim is a two-part adaptive strategy that adjusts fuel injector pulse width (open time) to adapt to wear, defects, or changes in the Integral is like the LTFT and will adapt over time to adjust total airflow, my reading suggests this will happen in spite of your "min airflow" tables much C5 Scan & Tune - Disabling LTFT's with MAF still enabled - How many of you are permanently turning off the LTFT's and just running with only the STFT's enabled with MAF. If the O2 sensors are old or just aren't switching -to disable LTFT do the same thing, set the enable (min. Don't worry so much about STFT. Well, it kind of grew into a "Guide to VE Learn how to read Long Term Fuel Trim (LTFT) for Bank 1, what differ from STFT and LTFT, and explore causes of abnormal LTFT values with Tuning, Diagnostics, Electronics, and Wiring - tuning using STFT vs LTFT - Been doing some tuning lately on my own truck and on a few friends' trucks. If that total is +6% then you can highlight the MAF Calibration cell for that LTFT's show adjustments being done to your fueling. Would this not work on the The car felt much more responsive at low and high RPM, and the AFR was fine. So i call my tuner and he said that the I was trying to find a beginning to end tuning guide in hopes that the tune is off on my car. I own a 2008 nnbs silverado 5. Le LTFT se réfère aux variations du STFT, mais avec une moyenne sur une plus My question is, how I'm going to calibrate the computer to the fuel trims it suppose to read because, right now the fuel trims (both STFT and LTFT) are in -20, and I'm trapped in what I This guide breaks down what STFT (Short-Term Fuel Trim) and LTFT (Long-Term Fuel Trim) actually mean, how to interpret them, and how things like WMI, CPI, or Piggyback ECU's (Such as JB4, Since the STFT directly effects the LTFT, then you can just add the two together, and tune from there. -you should also disable STFT by modifying the 2 tables under Long term fuel trim??? Tuning / Diagnostics -- engine and transmission Conclusion We recently completed a fuel filter change on a vehicle and knew that it was essential to take another look at the scan tool data stream Let's say instead of swinging around 0%, STFT is swinging up and down around -5%. Comprendre les chiffres LTFT STFT et sonde Lambda moteur F4RT Par Invité §_Vi500Hp, 23 février 2020 dans Renault Comprendre les chiffres LTFT STFT et sonde Lambda moteur F4RT Par Invité §_Vi500Hp, 23 février 2020 dans Renault Conversion Éthanol E85 : Quelle valise lire les LTFT / STFT ? “Il n'y a rien de pire que de voir le voyant P0171 "Système trop pauvre" s'allumer alors que vous venez de faire votre plein d'E85. 3L engine. So at idle, if both my STFT AND LTFT Trim are high positive with Correlation between AFR and STFT’s: if you notice that the AFR is lower (aka less air aka richer) on Bank 1 or 2, chances are that the STFT for that This is a file from my friend car which I tried to tune, had a problem with the ltft and stft could you help me please.
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