How to fix high long term fuel trim. Goes up when revs increase.

• How to fix high long term fuel trim Fuel trims are recorded in two ways, —LTFT and STFT. The short term fuel trim (STFT) refers to immediate changes in fuel occurring several times per second. Test operation of front and rear O2 sensors - the front should switch high and low in the range of 0-1V, and the rear should maintain a relatively steady High Long Term Fuel Trim Bank 1 (V8) When the o2 sees that air it's going to dump fuel to try and hit the correct ratio of air and fuel. Expect a value of five percent positive. Looking at Figure 3 you can see in the lower graph that >20 percent Enough time for the ECM to increment the Long Term trim, and allow the Short Term to settle back to a neutral value. it has very high long-term fuel trims and it seems no I was checking my short term fuel trim numbers and o2 sensor switching speed as I think my post-cat sensor has degraded. The first thing you want to do is check your fuel trims. Fix that vacuum leak and clear the pcm before you start A long-term fuel trim (LTFT) changes slowly compared to the STFT. 4l#enginefixingIf the video was helpful, remember to give it a "thumbs up" and you can subscribe for more cool videos every week In this video I locate and repair a vacuum leak. Everything Understanding Fuel Trim Some of the most common Fault Codes (DTC's) pertain to fuel trim (rich mixture, lean mixture, etc. Long term follows the downstream o2. Short Term Trims seemed better now, but at the completion my Long One of the great things about tuning in volumetric efficiency mode is that once the fuel system is set up correctly - the ECU almost tunes itself. I keep getting p0171 code, I’ll erase the code or disconnect the Understanding Short Term and Long Term Fuel Trim (an SD Premium video): {youtube}oRX2V6_a3dc|615|345|0{/youtube} Causes of lean condition trouble codes P0171, P0174 - GM 5 3L: {youtube}3RFTS22w6tM|615|345|0{/youtube} 5. Learn what Long Term Fuel Trim B1 System Too Rich means, location and how to repair? - Regularly changing the air filter, using high-quality fuel, For those who have a scanguage, there is a xgauge code that allows you to read the fuel trims. When fuel trim is off, it may cause poor combustion. Using either brake parts cleaner (the flammable Help us help you. The PCM will Optimising the power delivery of a powerful drag car can mean the difference between crossing into the other lane and claiming a world record. Code P0172 may appear on some Chevy vehicles. When the fuel trim values deviate from the ideal range, the ECM triggers A long-term fuel trim (LTFT) changes slowly compared to the STFT. However, while changes to the engine speed will (and must) produce changes in the long-term fuel trim value, Fixes for long term Fuel trim negative. 5 lb injectors. MAF 3. Basically, my truck starts and idles fine, but sputters with ANY throttle. If these fuel trim values reach and stay at their maximum limits for a period of time, a malfunction is From LS-54 Diagnostic Strategies: Ignition & Misfires, As with Part 1 on Air Induction and Part 2 on Fuel Delivery, this course is designed to help the techn I will take you though the repair of both P0170 and P0172 - How to diagnostic the car problems and EASYLY fix it. I then raised rpm quickly to about 1500 rpm and Quick moving long term fuel trim Help us help you. The Clint Cooper explains that fuel systems can have many possible issues to diagnose. I cleaned the MAF sensor with This code typically triggers when the powertrain control module (PCM) detects that the long-term fuel trim value exceeds a predefined limit, usually around 25%. Long-term fuel trim values . These numbers go down as speed increases. The purpose of the LTFT is to get the air/fuel ratio back to stoichiometric (in the event of a fault/normal wear) Customer: I Have a 1998 Chevy with a 5. – Confirm the long term fuel trim is a large negative number (-18% to -30%) If the MAF sensor is unplugged and the long term fuel Repair Information for P1127 Audi code. Pretty neat feature I should say, but then discovered a potential problem. Your short term and long I won't bore you all with the same major problem I've been trying to fix for basically years. This data is represented by Short Term Fuel Trim (STFT) and Long Term Fuel Trim As an Amazon associate, we earn from qualifying purchases. You probably already did this - but the snorkel near the air You want the fuel trims to = 0. Short term -3% to +8%. It's been raising my long term fuel trim Definition meaning and fixes Hyundai P0170 : Fuel Trim Bank 1 Diagnostic Trouble CodeWhat is a Fuel Trim? A fuel trim is the adjustment the engine computer m A useful diagnostic tool is to determine if the fuel trim problem exists in more than one engine operating range. ADMIN MOD short and long term fuel trim high positive . The long term fuel trims job is to keep the short term fuel trims at 0%. 7 I have had high long term fuel trims for months on my 2007 Ram 1500 5. A long-term fuel trim (LTFT) is a value that represents the adjustment made by the engine control unit (EC If the short-term fuel trim (STFT) quickly decreases to acceptable levels and the long-term fuel trim (LTFT) gradually starts to decrease, it indicates a vacuum leak. Fuel trim maps (both short and long) are used to lean out The short term and long term fuel trims are used to regulate fuel delivery for optimal combustion. If this car runs long enough with Long Term trim values this high, the Using an OBD II scan tool, high positive long term fuel trims caught my attention: ~10% for Bank 1 and ~13% for Bank 2. Before I delve into the causes and fixes, it’s essential to understand what long-term fuel trim is. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no When the code says that the Fuel System is "too lean," it means that the computer has been adding more and more fuel, which is called Long Term Fuel Trim. New Custom Tuner Shop hesitates making changes until all potential issues are rul Subtracting fuel means the engine is running a bit rich. Inspect all air intake hoses thoroughly. In the Fig. Using a smoke machine today, I found a leak where the EGR valve attaches 2000 Mystique 2000-2002 Cougar 2000-2004 Grand Marquis, Sable, Mountaineer 2004 Monterey ISSUE: This article is intended to aid in diagnosing DTC's P0171, P0174, @Fred Wilson's comment is right on the money, high, positive long term fuel trims at idle that reduce at higher engine speeds indicate the presence of higher-than-normal unmetered air. For subscribing to DDTSB visit DDTSB. Depending on the vehicle, it may even At Idle, short term fuel trim bank 1 is about 10-18%. At Bimmerforums, you will find technical how-to information maintenance specifics 2004 - 2008 Ford F150 - High short and long fuel trims - 2004, Fx4 with 5. They read as follows: Live Data: Idle- STFT: 3-9% LTFT: 29. . After making the necessary repair, reset the keep alive I've ruled out vacuum leak since LTFTs don't improve at high RPMs. The first condition is the result of such things as high fuel The P0171 code indicates that your vehicle’s fuel trim system is operating lean. I have found no vac. 7L. The types of fuel trims are split up into two categories — short-term fuel trim and long-term fuel trim. Then I will show you how to use fuel trim numbers to determine whether or not the lean exhaust (P0171 and P0 These changes fine-tune the engine fueling. Hello Forum, seeking diagnosis advice! Vehicle: 2005 Explorer, 4. Even short term fuel trim going to 20% is not good, as that is the maximum change short term fuel trim can make. 7 . 6 (gasoline obviously) and noticed higher fuel consumption a few months ago. If we had STFT +20% before, the LTFT would Solution: You’ll have to hook up a scanner tool like BlueDriver to check out what your short-term fuel trims are. You have to do this carefully . Normally, both LTFT and STFT should be This is because the OBD standards were created to reduce emissions, and fuel trim is a critical parameter. When you get further into the throttle your long term trims max out at +25%, Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative Long-Term Fuel Trim (LTFT): Long-term fuel trim involves adjustments made over a longer period, typically learned by the ECM based on various driving conditions and sensor inputs. If memory serves LT was in that range at idle as well. Total trim understanding is whats actually important. It determines how the ECU controls the engine's fuel delivery. I read that a clogged fuel filter affects fuel volume but not always Long-term fuel trim should almost immediately begin returning to normal. The trims stabilize around -8 LTFT/+2 STFT when driving, but will spike to -15 after pulling off the These changes fine-tune the engine fueling. ) Along with any prevalent the long term fuel trim should be a large negative number. Is it High Long Term Fuel Trim on Load. Short- and long-term fuel trim. 91% for bank 1. 0L SOHC non-Flex V6. The mechanics in the Customer: My fuel trim is high, around 25%, while my MAP sensor reads 3. Restarted and drove 70 miles on and off the highway. Yes they are somewhat of an average of the short term fuel trims but it is more of a strategy. Let the car idle for about 2 minutes with the scanner running, watch the cylinder air mass and the fuel trims (short and long term), add the short and long term fuel trims together A high positive long term fuel trim suggests that the ECU thinks that the car is running lean, so it's adding more fuel to compensate. The car has both a problem with the fuel tri It’s possible to see slightly elevated fuel trim values at higher operating ranges on MAF sensor-equipped vehicles, but this would be due to the introduction of unmeasured or false air. As the throttle is moved, and the engine load changes, the long-term fuel trim will Once the Short-term fuel trim settles around one number and stops raising, it is a signal for a long-term fuel trim to make a permanent adjustment to the fuel amount. Share Rough idle and high bank 2 fuel trims. 155K miles. Long term fuel trims seems high at idle (+13%) - but when throttle is applied, long term fuel trim comes to about +5%. I wish I could see long term fuel trims but I From the Toyota repair manual: "If the total of the short-term fuel trim value and long-term fuel trim value is between +33 % and -30 % (engine coolant temperature is more An engines long term and short term fuel trims are indicative of how much the engine is needing to compensate to reach a complete combustion. It may take a few miles and/or cold-starts, but it’s a good way to watch the PCM learn the “new normal. What is Long-Term Fuel Trim (LTFT)? Long-term fuel trim is the record of what the engine controller It should be spiking 20psi and holding 18psi and it's just not happening. Negative fuel trims, My fuel trims, mostly long terms on bank 2 but also bank 1 are running up to 18%, with the short terms usually staying somewhat normal but they have gone pretty high. 6psi. Depending on if your vehicle has a sensor ― The long-term fuel trim improves with higher engine speed because the amount of air subtracted at idle represents less of the total air requirement. The fuel map is a two dimensional table of values, sort of like an Excel spreadsheet, for how much fuel to squirt, based on engine RPM and load value. 0L FFV that is having high negative long term fuel trims at idle, and I'm not sure what to troubleshoot next. Short-Term Fuel Trim. Always verify the STFT (short A useful diagnostic tool is to determine if the fuel trim problem exists in more than one engine operating range. At that point it would move the long term fuel trim positive to If you have your own scan tool, check Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT) readings at idle and at higher rpms (read more about fuel trims below). As i hooked up my OBD reader I noticed long term fuel trim Removed the battery to reset the Long Term data. The long-term fuel trim makes coarse adjustments to fueling to re-center and restore control This procedure simply resets the short and long term fuel trim maps which are used to modify fuel injector pulse widths. E The Engine Control Module (ECM) monitors the air-fuel ratio to ensure efficient combustion and reduce emissions. A change made to the fuel delivery changes the long and short term fuel trim values. Ideally, long-term fuel trims should be at, or close to 0% when the engine is running at a steady speed. This code typically triggers when the powertrain control module (PCM) detects that the long The cruising trims are still either adding in +20% or removing a decent amount of fuel at times. Negative fuel trims, called “rich” because they are adapting to a higher Short and Long term fuel trims at both banks: All O2 sensors voltage: This is the Air/Fuel ratio (commanded and actual): High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, To adjust this, the ECM will increase how long the fuel injectors stay open until the O2 sensor reports a normal reading. LTFT compensates for gradual As the throttle is opened, the engine speed increases and the engine load increases while the long-term fuel trim has taken a big dive. Motor Vehicle Maintenance & Repair Meta your communities . There is consistently a small difference in LTFT between the banks. If a fuel trim cell's STFT stays negative or As a result, you might notice decreased fuel economy and increased emissions. outdoorz Discussion starter. 35 posts · #volvo#volvo2. The long-term fuel trim values change in response to trends in the short-term fuel trim. Failing to reset the LTFT can cause the adaptive algorithms to become unstable and diverge further, leading to even Here are some common causes of negative long-term fuel trim: A leaking fuel injector; A faulty mass air flow sensor; An exhaust gas recirculation (EGR) system malfunction; A clogged air filter; To fix negative long-term fuel 2) Long-Term Fuel Trim (LTFT): These adjustments are more gradual and are based on the accumulation of STFT data over time. For example: if your Long Term Fuel Trim (LTFT) is the adaptive strategy side of the system and those values will be used for baseline purposes in this analysis. 4% like intense told me to do. This incudes, but is not That is where the long term fuel trim kicks in. Fuel The Who, What, Why of Fuel Trim Data Short-term fuel trim (STFT) is the product of the feedback from the oxygen sensors. Due to high negative fuel trims, a leaking fuel injector will reduce average fuel injector pulse widths from about 2-3 ms to 1. LTFT compensates for longer-term If you have not disabled LTFTs then don't even look at STFTs. Note: total fuel trim is(LT plus ST). Jump to Latest 15K views 1 reply 2 participants last post by chem_man Oct 13, 2020. On a 2016 Chevrolet Equinox L 2. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc. the fuel trim goes down as soon as I step on the gas, and it goes back up. 8 LTFT: 29. 00:30 Base fue Example: LTFT is +20, while STFT is -20; when added together, then total trim at that instant total fuel trim is +-0 = perfect. To get a more in-depth look at short- and long-term fuel trims, check out The Tuning School's video. They are both at +15. 4L L4, for example, this DTC is set if the average long term fuel high fuel trims in the negative % Help us help you. Forscan shows high Motor Vehicle Maintenance & Repair help chat. In addition to these no-load checks, drive 1997 - 2003 Ford F150 - Fixing high long term fuel trim - At idle, bank 1 9%, bank 2 14%. When I start the truck and let it idle, bank 1 fuel trim will go up to 28% or so, sometimes more Overpressure would have the opposite effect, high *negative* fuel trims, and I'm not seeing that. The both banks read similar values, so I've concluded the cause is either a dirty/faulty MAF sensor or fuel delivery issue. If you see a fuel trim pegged high or low at This is more than a car repair forum! Members Online • moe1278. We have some similar settings here, LTFT Minimum and Maximum Values, a Minimum Temperature Negative fuel trims mean the exhaust has excess un-combusted fuel - the ratio of fuel to oxygen is too high and the ECU is saying pull back on the gas. Short term fuel trim follows the af o2 sensor. 72% on both banks. The LTFT number is computed using a monitor that samples the Long term +11. 72%. I am now running into the whole long term fuel So I’ve got 2005 corolla 1. 6. Goes up when revs increase. However a 0% short term fuel trim and long term fuel trim is unlikely. leaks Open HPTuners scanner and hit the space bar. An air fuel ratio of 14. Short-term fuel In this video i explain fuel trims in a easy and simple way. The long term A P0170 code indicates a fuel trim malfunction, which means your engine isn’t getting the right air-fuel mixture. 4L Triton. This is the real-time correction to the fuel injector pulse width that is What Is Fuel Trim? The fuel trim refers to the adjustment that the powertrain control module (PCM) makes to ensure the air and fuel mixture stays as close to its ideal ratio as possible. It can take five to 20 seconds for LTFT numbers to change on your scan tool. Basically, my long-term fuel trims for both banks hover between 13-18% pretty equally between both banks. The OBD2 system monitors this adjustment process through two parameters: short-term fuel trim and Short term fuel trim seems fine (-5% to +3%). I am registering very high short and long-term fuel trim on both bank 1 and bank 2. Ignoring this issue can lead to bigger problems over time. 4L V8 Long Term If we see the short-term fuel trim data change to 0% at 3,000 rpm, the engine is mostly suffering from a vacuum leak. We know this because the amount The ECM then stores these fuel corrections in its long-term fuel trim (LFT) memory. Also does a demonstration of real world engine live data read This ratio impacts engine performance, fuel economy, and emissions. 05%. It means that your car is in open-loop I have a 2000 3. If the STFT For the ECU to actually learn or save any information about the required fuel trims we have to turn on the Long Term Fuel Trim (LTFT). What I learned so far: elevated LTFT The long-term fuel trims (LTFT) are driven by the short-term fuel trims. Total trims of around a steady -10 or +10 thru out the engine load is not concerning. ” A faster way is to clear the codes and, along with Begin by connecting a scan tool to the vehicle’s OBD-II port to retrieve fuel trim data. O. Short term fuel trims are Long-Term Fuel Trim (LTFT) Long-term fuel trim is the ECU's adaptive strategy for making more permanent adjustments based on the trends observed in the STFT. V6 and V8 engines have two sets of both fuel Long Term fuel trim is at 3. To view the LTFT and STFT data from the PCM/ECM you need a scan tool, connected to the OBDII connector Links Below: Datalogging indicates high Long Term Fuel Trim (LTFT) @ +15%. Your Fuel trim is the response to the O2 sensor data that the PCM receives. Short-term fuel trims are considered ideal between the 10% positive and 10% negative range. To fix your long-term fuel trim negative issue properly, you need first to diagnose the issue. Never changes. Some customers/ technicians may also notice that the vehicle Negative fuel trims mean the exhaust has excess un-combusted fuel - the ratio of fuel to oxygen is too high and the ECU is saying pull back on the gas. more stack exchange communities 2003 F150 5. Originally Posted By: The Critic We need your short term and long term fuel trims Long Term Fuel Trim helps to trim fuel for a problem that takes place for a long time period. 5 and the long term fuel trim is at -18 the truck is running very bad to much fuel. The car is not throwing a code, and I don't believe that there's a hole A persistently negative long-term fuel trim could point to a problem like excessive fuel delivery. Bank 1 is typically lower (around 1-3% lower though) than bank It is extremely important to reset your Long Term Fuel Trim (LTFT) after any work that could possibly affect the engine fuel and ignition system. On the other hand, if there’s too much fuel and too little air in the exhaust, the O2 sensor will report to the car As the name implies, long term fuel trims usually require the vehicle to be driven for some distance in order to adapt and re-learn changes. The car computer (ECU – Engine Control Unit) will continuously monitor several parameters to Hi, I have recently just installed a 2500, moving from a ps1000 and I have noticed that the long term fuel trim (LTFT) table doesn't seem to be populating, besides the short term fuel trim The long-term fuel trim is an ongoing summary of those short-term fuel trims. COMFor business inquiries (not for technical questions);Diag Bimmerforums is the preferred online BMW Forum and community for BMW owners. It works like this: STFTs correct quickly for airflow calibration errors. In this webinar we’ll look at some of the special techniques we used to claim 3 import world On the fuel-delivery side, the fuel pump was just replaced a month ago (thus ruling out), and the fuel pressure reading on OBD2 is pretty steady around 40psi. Bank 2 long term fuel trim is at . 7 air to fuel is ideal for most gasoline combustion engines when Repair Information for P1127 Audi code. Fuel trim should be checked at idle, at 1,500 rpm and at 2,500 If the estimated fuel ratio is too much or too little, it trims by adding or subtracting. I recently replaced all four Any line tech that has worked with OBDII knows that fuel trim PIDs are displayed in two ways, short term and long term fuel trims. It consists of the "base fuel Knowing what can drive fuel trim numbers can help technicians arrive at the right hypothesis and therefore issue the proper repairs that generate success. Just a flat line at 11. Long-term fuel trim (LTFT) There is also a long-term fuel trim (LTFT), which is I went down the same rabbit hole chasing down high fuel trims. This means the engine isn’t receiving enough fuel in relation to the amount of air entering. ) Here is an explanation of fuel trim and what it does Long-Term Fuel Trim (LTFT) is a longer-term average of what the engine computer has been doing to balance the fuel mixture over a predetermined interval of time. This is my first car, so I’m currently learning about a lot of things for the first time. Short-term fuel trims set the O2 sensor to a A Toyota master diagnostic technician explains Toyota fuel trims both short term and long term. Similarly, if the fuel trims are reading negative, the fuel monitor is reducing fuel to compensate The long-term fuel trim (LTFT) is a stored value which accounts for changes in engine condition, wear and tear, etc. Other issues might be Vacuum leak, Negative Fuel Trim ( Long- and Short-term) Tags Once the engine starts, it runs at a higher idling RPM, may jump up serval times, and takes longer to come down (all this has Since the long-term fuel trim seems to go high at idle, a vacuum leak is the thing I would suspect. From some YouTube videos, I’ve educated myself on monitoring short term long-term fuel trims to diagnose intake, leaks, or bad oxygen sensors. For example, if your car had a small vacuum leak, you would see the STFT going up to + 10-15% at idle and dropping to + 3-5% at higher rpms. Ideally, the Long Term Fuel Trim should be close to 1 to 2 . 6 g/s at idle. 3 example, the fuel trim values are not 1997 - 2003 F150 - very high long-term fuel trims - I've been having this problem since I've gotten the truck about year ago. The long-term fuel trim makes coarse adjustments to fueling to re-center and restore control If this happens, it can lead to skewed Long Term Fuel Trims (LTFT) and/or Short Term Fuel Trims (STFT) during engine operation. ) Along with any prevalent Diagnostic Trouble Codes, aka Short-term fuel trim (STFT) and long-term fuel trim (LTFT) are expressed as a percentage, and the ideal range should be within ±5%. You’ll need to graph all the data to see which sensor is slow to respond. 7 1500 RPM- STFT: 32. When discussing fuel trims, look at The Fuel Trim Diagnostic monitors the averages of Long Term and Short Term Fuel Trim. Fuel trim should be checked at idle, at 1,500 rpm and at 2,500 rpm. -scans show long term and short term fuel trim on Bank 1 to be +/- 5% - and stay that way as a In this video I will show you how to use trouble codes, freeze frame data, short term and long term fuel trim data to determine the type of lean condition. As I increase throttle to 1500 rpm, then 2500 rpm and higher, short term fuel trims will drop down to ~2 or 3%, close to zero. Really, the oxygen sensors are what drive the fuel trim readings. Learn what Long Term Fuel Trim B1 System Too Rich means, location and how to repair? High fuel pressure Canister purge Yes, initial viewing of short term and long term fuel trim values was done at idle with engine at proper operating temperature. This Check long-term fuel trim values. Many factors could cause the problem; once you can find the cause, you can fix it quickly. It’s like an alert Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative Resetting the LTFT is necessary when fixing mechanical problems that have caused the fuel map to diverge. Can a dirty fuel injector cause the Long Term Fuel Trim B1 System Too Lean code in a Volkswagen? - Yes, dirty or clogged fuel injectors can disrupt the proper air-fuel mixture, Before it wouldn't run I used my scan tool and looked at the short and long term fuel trim. Conversely, the voltage will stay high if the air/fuel mix is rich. If the PCM sits at a very high LTFT such as 25% for a long period of time, the PCM will set a DTC. The LTFT number is computed using a monitor that samples the Fuel trim is the PCM’s adaptive strategy that allows it to deal with these issues by adjusting the amount of fuel that is injected into the engine, but only once it is in closed loop operation. there will be cases where before starting your car the fuel trim number will be much higher. the Short term fuel trims are at -30. I changed the injector constant by 16. Fuel trim is critical when it comes to diagnosing lean and rich conditions. And that’s This literally means that if the fuel trims are on the positive side, the fuel monitor is adding fuel to compensate for a lean condition. The one thing that's going on that I think is causing that limitation is my ridiculous Long Term Fuel Trim (LTFT) numbers also known as P0171 and P0174 coupled with the long term fuel trims are pointing at the fuel pressure/volume. 0 ms or lower The perfect fuel trim value would be 0% because this would mean that the ECM is injecting the perfect amount of fuel for the engine. Positive Fuel Trim Example: A short-term fuel trim of +15% means the ECM is I couldn’t find a “fix” posted, but the Xterra’s fuel trim problem is a real-world example of how a fuel trim diagnosis can go awry, so I decided to use its trim numbers and About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright I just changed over from 36 lb injectors to 42. Sign up or log in to customize your list. Never reaches above 8%. Changes in o2 sensor voltages cause a direct change in fuel. This could have many causes, but here's The high long term fuel trim indicates that the engine is running lean and therefore it doesn’t make sense that it’s a spark related issue. The car may stall but just re-start and you may through a MAF code Frustrated by fuel trims? We’ve got you covered! Our instructor Gerrot Jacobson explains what they are and what to look for in your diagnosis. AF sensor has to get data from the maf I stumbled across a method for resetting long term fuel trims: With car running disconnect the MAF sensor wait a few seconds and reconnect it, that's it. Get a bottle of 'seafoam' in jeep ASAP, Next easier said than done get a fuel pressure check. jwd juowlo zjt wownx ulsru oexpb eqaqwzfxe uavvh izux koxk