E46 Long Term Fuel Trim

Engine RPM. Short-term fuel trims (STFT's) refer to the instantaneous fuel trim correction being applied by the engine management in response to rapid changes in throttle and load. To access them by name, simple prepend DTC_ to the Mode 01 command name. A first look at the data showed that the long term fuel trim was at 24% at idle, while the short term was around 0%. For the BLM/Long Term Fuel Trim 155 is still within boundaries of the ECM adjustment to fuel, IIRC the max BLM in ASDU is 172. If Additive and multiplicative are both long term fuel trim, where does the short term, or here and now happen. I found the solution to my long term fuel trim problem. 8% is a definite tell-tell sign of something amiss. It was recently mapped and Duncan noticed it was running rich, but was unable to lean it out without causing running issues. Example: Histogram showing TOTAL FUEL TRIMS, vs RPM and LOAD -- This trim history of combined LTFT/STFT shows this highest average was ~+7%, and ~-6% = within 10% Below, you will find an example from the SAME datalog that shows how reviewing only an instant of fuel trim data can make you believe there is a fuel trim issue -- a fuel trim issue. I had a +30% value in the engine computer. 7:1 A/F Ratio) Most vehicles operate between 90-110% short and long term fuel trims, this accounts for most variables such as fuel, air quality, barometric pressure, altitude, air density, driver's lead foot, etc. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. Short term trim remained normal. Fuel Trim and Misfire Analysis A "No Excuse" Approach. If the STFT stays consistently negative or positive for a long period of time. on a car running st1 inj and 68 fp fuel trim long term are at -6. The ideal fuel trim values are around 0 percent. If you install an aftermarket air filter that is less restrictive than original equipment, it will affect intake airflow. Long term fuel trim and short term fuel trim are different things and they correct the fuel supply, but are not the same as fuel trim cell number. Also, there is a TSB 18-028-06 that is specific to the 05 wrangler concerning the check engine light and code P2096 or P2098. But your cars's manufacturer may have a other specification for the P1166 VOLKSWAGEN code. My understanding was that LTFT should be mostly stable? The STFT jumping around is usual behavior but this should influence a slow change in long term trims? I reset the ECU about 3 days ago. Multiplicative mixture adaptation: This adaptation is referred to as "long term fuel trim". PWM FUEL TRIM (LONG) – BANK 2. This value is a more accurate indicator of how the fuel mixture is being corrected to compensate for changes in the air/fuel ratio that are occurring inside the engine. • Be certain the engine is at operating temperature and in closed loop. Long term fuel trim enables the PCM to compensate for variations within the engine itself resulting from production variations, engine and component wear, and minor malfunctions. Fuel trims are a/f mixture ratios expressed as a percentage (100% = perfect 14. The e46 325i was initially offered in Standard, Exclusive, Sportpack and Individual trim, with a Touring and Ti version joining the set later on. Far more data needs to be provided and I need to understand what software or tool you are using to gather data and clear Fuel Trims. The fact that the O2 sensor is jumping around means only that the computer has successfully compensated for the rich condition by pulling enough fuel out (hence, the way negative trim), so you should be getting right around 14. With the short-term trims being negative, does that mean the ECU thinks the mixture is rich? The air filter is fine, though the exchaust pipe is black and always has been, even after a long run. the long term and short term fuel trim 3&4 are 32. This adaptation. Maybe this is common for everyone, but this monitoring is new to me (regarding fuel trim). How much LTFT is too much? Each car maker is different, but the general rule is that a LTFT of +25% or -25% indicates a serious problem. Long Term Fuel Trim (LTFT) -- The correction factor (percentage) being used by the fuel control system in both open and closed loop modes of operation. The ECU controls Air/Fuel mixture in order to maintain power, efficiency, and emissions. hey friends i have changed my fuel injectors late from 240 cc and replaced them by s2000 injectors with 550 cc so do i need to change anything like the overall fuel trim or crancking fuel trim or throttle tip in trim and what about the post start fuel adjustment please friends i need some help under this tab so could anyone help me??. The Short Term Fuel Trim's job is to either add or subtract fuel based on how the engine was currently running, the Long Term Fuel Trim adds or subtracts fuel based on a trend that the Engine Control Module (ECM) sees. A positive fuel trim value indicates the control module is adding fuel in order to compensate for a lean condition by increasing the pulse width. Short term fuel trim (STFT) refers to adjustments being made in response to temporary conditions. OEM Bimmer Parts is the #1 rated source for BMW parts & accessories at discounted prices with free shipping on orders over $55! Click or call today. BMW ECU uses oxygen sensors to measure the amount of oxygen in the exhaust to control those values. 2005 dodge srt4 with 3inch CAI and 3inch exhaust wit cat well my long term fuel trim at idle is about 16. Trained cyclists given 2. Another effective test is to measure the pressure loss in the fuel rail when each injector is fired and pulses for a set period of time. After its at +5 long enough the ltft will goto +5 and the stfu would go back to 0. No misfire codes. You have a modified Sonic, so seeing that the car is asking for more fuel at times makes sense. This was my process in diagnosing and repairing this problem. -21 means 21 percent less fuel than base trim for that cell. The Long term Fuel Trim is back to 25% at idle, even with the replacement MAF. asked by Michael H. How to Confirm a Rich Condition Causing Trouble Codes: P0172 or P0175. Fuel System Status 5. DTC (diagnostic trouble code) P0170. reason this is important to me : allot of big turbo guys get a stumble at idle real quik like a bog down almost. 00 % thanks for the help. A positive fuel trim value indicates the control module is adding fuel in order to compensate for a lean condition by increasing the pulse width. If there is a consistent +10% on the Short Term, the ECM will move that over to the Long Term, this way the Short Term can go. Hesitating Engine. Things done so far. Long term fuel trim, or LTFT, is the correction the PCM learns over time and stores in keep-alive memory. Long term fuel trim is stored in adaptive memory. Are these the correct data points for monitoring long term fuel trim? What do the terms "range 1" and "range 2" mean? What do FRA and RKAT mean? What are the units of measurement? What do the values signify? What are ideal or good values on a Boxster motor that is running well? What kind of numbers would show running lean vs running rich?. 812 % Fuel Trim Bank 1 Long Term = 11. 0 were it should be. In the moment Z short-term fuel trims again goes out of correction range, this time for more that 10 seconds: event (3), and now the long-term fuel trim range is getting corrected, increasing short-term fuel trim middle point for additional +12%. what type of scan tool are you using? can you monitor your o2 sensor readings? Is this happening in open or closed loop?. 062 % Engine RPM = 2,006. With the short-term trims being negative, does that mean the ECU thinks the mixture is rich? The air filter is fine, though the exchaust pipe is black and always has been, even after a long run. A first look at the data showed that the long term fuel trim was at 24% at idle, while the short term was around 0%. The Long Term Fuel Trim on both bank are too high ~14-20%. 0 were it should be. Testing the software included extensive road and dyno test cycles, with acceleration and deceleration tests for driveability smoothness and ECU fuel management. A newbie here. Fuel Trim Bank 1 Short Term = 7. Regards, paul. I have just installed 2 new O2 sensors and the Fuel Trim % for the B1S2 sensor is still pegged at 99. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. One, to consistently control the engine fueling to maintain a stoichiometric [or 14. I is my understanding that fuel trim should be 0 in the long term, maybe be up or down my 1 or -1, but like i said its normally in the positive. The short term FT values change rapidly in response to the HO2S voltage signals. OBDwiz is a diagnostic software that comes FREE with OBDLink scan tools. By Robert Angell, January 30, 2006 in FWD/AWD 1998 and Prior. To verify and tune for long term fuel trims, drive the vehicle for 30 minutes or until warmed up, monitor long term fuel trims and get an average value. 06 out in the program. It seems these numbers change with fuel ups and noting that in the scanguage. The DME in. If that is the only code and everything else is fine, the TSB requires reprogramming of a code section of the PCM which will cause the code and check engine light erroneously. • Use ONLY OBD II scan tools in Global or Generic mode – no VIN entry. Seems high to me but it runs good and gets good mileage. The e46 325i was initially offered in Standard, Exclusive, Sportpack and Individual trim, with a Touring and Ti version joining the set later on. For the long term fuel trim values, Durametric calls them (for my '07, DME 7. LTFT refers to changes in STFT but averaged over a longer period of time. Long term fuel trim: -4. Air Flow Rate 12. Short term fuel trim is in direct response to dme inputs and long term is an average of stft over time, not all that long of time. That is why you are getting terrible mileage. PWM FUEL TRIM (LONG) – BANK 2. Fuel trim is expressed in terms of short term or long term corrections. Fuel trim can be affected by just about anything between the air filter and the muffler, including sensors, injectors, ignition, EGR, the engine's mechanical condition and even the crankcase ventilation system. If the Long Term Fuel Trim remains around 0% with the air filter temporarily removed, there is an issue with the air filter that is causing lower than normal MAF readings. The QX50’s turbocharged 2. Sent from my iPhone using Tapatalk. 7 grams of air to 1 gram of fuel. This 1999 328i would not set it's catalytic converter engine monitor for over a year. This action is called fuel trim. Some vehicle will use the LTFT in these blocks in open loop status. On a side note, my bone stock 08 with Hypertech tune has a +20 long term fuel trim sometimes at a certain throttle position (going up a hill). Yesterday I got the Torque app working on my mobile, and have been looking at what might be causing it. Calculated LOAD Value. You have a modified Sonic, so seeing that the car is asking for more fuel at times makes sense. asked by Michael H. Under normal operation, the ECU cycles between rich and lean air-fuel ratios, at the same time learning short-term fuel trim and long-term fuel trim (STFT and LTFT) values. It could be that the dead times from the factory are not 100%, but that would be unusual. Additionally, the ability to correct short term trim corrections (the difference between target and scheduled fuel mixture) remain within OEM specifications. 7 to one (say 16 to one), it is LEAN. it is the 'learned' value of the engine management system. it always feels nice to know somebody elses car is worse off than yours !! in all honesty though my car hauls ass. All test cars were put through long term full throttle testing in conditions varying from wet cold climates to hot dry Arizona desert temperature for safe-optimal air fuel ratios and. 375 % Fuel Trim Bank 2 Long Term = 10. I have checked upper and lower intake boots, - Answered by a verified UK Auto Mechanic We use cookies to give you the best possible experience on our website. # define LT_FUEL_TRIM_2_DESC " Long Term Fuel % Trim - Bank 2 ". Positive fuel trim it is adding fuel to correct a lean condition negative it is removing fuel to correct a rich contition, short term fuel trim will vary at idle between positive and negative, long term fuel trim is learned by pcm from the short term fuel trim values. Clear trouble codes and turn off the MIL ("Check Engine" light) 3. For example after a fresh flash they will both be at 0. long term fuel trim is not adjusting? If this is your first visit, be sure to check out the FAQ by clicking the link above. • High fuel pressure, caused by pressure regulator or restricted fuel return line • MAF malfunction, sending incorrect signal information to ECM Multiplicative mixture adaptation: This adaptation is referred to as “long term fuel trim”. I used my scan software to check things out and the Long Term Fuel Trim (Bank 1) is at 19. Oxygen sensor voltages/associated short term fuel trims 14. 1997-2006 Expedition & Navigator - Short and long term fuel trim question - what determines or controls the fuel trims and why is it I have a major difference between B1 and B2 LTFT. To be sure, long-term perspectives can be found in the West as well. It is stored in the DME when the key is turned off, when the engine is restarted, long term begins where it left off. The signal from air fuel ratio (A/F) sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the theoretical value. A short term fuel trim. 1997 BMW 318i Long-term Fuel Trim, P1140. Monitor the Long-Term Fuel Trim (LTFT) readings at idle and at cruise speed to determine when it's lean. UltraGauge is both a OBDII Scan Tool and an Information center which displays selectable engine gauges. The car in question yields consistent negative long term fuel trim numbers on idle. For 1996+ models (OBDII) there is a short-term and long-term trim that affects either closed-loop or open-loop operation. OEM Bimmer Parts is the #1 rated source for BMW parts & accessories at discounted prices with free shipping on orders over $55! Click or call today. Engine code p0171 p0174 Long term fuel trim at idle only is 25% when you hit the gas pedal is go down to normal but as soon you let go the gas pedal is go back to 25 running too lean%. what iv been talking about is the short term fuel trim Fuel trim make no sense for a downstream. The reason I was wondering if the long term trim carried over to the open loop is because in some datalogs I did long term is shown as +or- a certain percent. Seems high to me but it runs good and gets good mileage. Long Term Fuel Trim 8. Short Term Fuel Trim - Bank 2. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. A negative fuel trim percentage indicates a taking away of fuel while a positive percentage indicates an adding of fuel. Watch your engines temperature, voltage and oil pressure while running on the hose. - During cold start, they are about -11% vs -19%. This leads to confusion with respect to injector flow rate, and people lose sight of how their injectors really work. Different fuel trims per engine bank? Hi Guys -- I got a CEL and it was the random cylinder misfire code, not specific to a single cylinder. Short-term fuel trim (STFT) and long-term fuel trim (LTFT) are expressed as a percentage, and the ideal range should be within 65%. If long-term fuel trim (LTFT) for bank 1 is 25% at idle, but corrects to 4% at 1,500 and 2,500 rpm, focus on factors that cause a lean condition at idle, such as a vacuum leak. Jaguar calls this the Adaptive Fuel Trim Display application. Installed my PRL Cobra CAI with Street MAF last night and after a 30 minute drive today, I noticed that my Long Term Fuel Trims had increased from 0% (on my stock airbox) to -3% (on my PRL CAI). P0171 and P0174 will be recorded if long term trim remains roughly 10% or higher positive, meaning the ECM is ADDING fuel. The signal from air fuel ratio (A/F) sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the theoretical value. on March 13, 2017. be aware that improper fuel injector settings will screw up fuel trims. Long Term Fuel Trim - Rich The short term trims should fluctuate positive/negative, but the long terms should adapt to the current conditions, which includes. Gen III - Speed Density VE Table and MAF Tuning Instructions with a Wideband O2 Sensor Create by 69lt1bird - Jeff Anderson 2 system is operating rich, long term fuel trim will compensate for the rich condition by decreasing the injector pulse width, and a negative long term fuel trim is indicated. 062 % Engine RPM = 2,006. (But plus or minus 10 for the long terms is within tolerance). I'm hesitant to mess around with those plugs again, searching to see if there's another gapping. If that's the case, you have to trace things and see where it's getting excess air, making it add fuel, or not enough fuel making it do that. So the fault occurs in the idle and just off idle areas. Is 9% long term fuel trim anything that i should try and get to the bottom of ? or just let it be. 7L with about 82,700 miles on it. The long term fuel trim is the fuel adjustment based on the trend of the short term fuel trim. If you are in FTC #22, you are operating open loop. Long term fuel trim is the PCM's ability too add, or remove fuel for optimal operation. This value is measured. High fuel pressure, caused by pressure regulator or restricted fuel return line MAF malfunction, sending incorrect signal information to ECM Multiplicative mixture adaptation: This adaptation is referred to as “long term fuel trim”. I checked all vacuum hoses through manual inspection. 5s CVT sedan, but wife is a little worried about long-term reliability of Nissan cars. This minimizes knock sensor activity, which in turn means smooth engine performance, catalyst protection and power increase, while this is also required to make the car emissions legal. It does this by increasing or decreasing the injector pulse width. The bank 1 long term trim was still through the roof and short terms were around zero at idle. This means it affects injector duration in open and closed loop = all running conditions. The air-fuel ratio should stay at, or very near to 14. This value is a more accurate indicator of how the fuel mixture is being corrected to compensate for changes in the air/fuel ratio that are occurring inside the engine. 1 and an in spec "idle range" fuel trim would be in the range 0. The computer won't set a lean code until the long term trims (LT) exceed +25 or the short term trims (ST) exceed +5. They fluctuate between. LTFT near zero). The long-term fuel trim (LTFT) is a stored value which accounts for changes in engine condition, wear and tear, etc. The signal from air fuel ratio (A/F) sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the theoretical value. And anything above 10 + or - when you add the long term and short term numbers is a sign of a problem. Short Term Fuel Trim 10. Pretty neat feature I should say, but then discovered a potential problem. I also run diesel kleen every tank drain the separator every month. Today when I first started up the engine you could hear like a noise coming from the air filter, so what i did. Engine Coolant Temperature. 8T, and my mechanics have ran out of things to do while my MIL would come on about every 200km. 00 % Engine RPM 0. 1997-2006 Expedition & Navigator - Short and long term fuel trim question - what determines or controls the fuel trims and why is it I have a major difference between B1 and B2 LTFT. i am running a mazdaspeed cold air intake,corksport down and mid pipe and stock catback. hey friends i have changed my fuel injectors late from 240 cc and replaced them by s2000 injectors with 550 cc so do i need to change anything like the overall fuel trim or crancking fuel trim or throttle tip in trim and what about the post start fuel adjustment please friends i need some help under this tab so could anyone help me??. Now change that filthy air filter. ★ Long Term Keto Diet Results ★ Forskolin Fuel Comprar Coleus Forskolin Uti Pure Natural Forskolin Scam Forskolin Fuel Comprar Many thorough studies are usually made this diet, and it consistently produces lower triglycerides, lower high blood pressure and lower blood handsome. indd 9seanboyle-fuel. Short Term Fuel Trim. Understanding Fuel Trim Some of the most common Fault Codes (DTC's) pertain to fuel trim (rich mixture, lean mixture, etc. This means it affects injector duration in open and closed loop = all running conditions. My LTFT1 is a bit wayward, cruising along all seems ok at +/- 4 ish percent but when slowing down on engine braking, or braking or idling, the LTFT1 shoots up to +28% while LTFT2 stays at a normal level. You can use this to vie the short term correction in manufacturer specific fuel control when Additive and Multiplicative fuel trim are used. At constant highway speed, front O2 sensor lambda is very close to 1 (voltage around 2. Perfect AFR s/b 14. Positive fuel trim percentages indicate that the powertrain control module (PCM) is attempting to richen the fuel mixture, to compensate for a perceived lean condition. I found no option to reset the long term in my scanner. ) Here is an explanation of fuel trim and what it does for us. When DTC P0172 or P0175 is recorded, the actual air–fuel ratio is on the RICH side. Fuel B2 System Too Rich P1141 Load Calculation Cross Check Range/Performance P1144 Mass Air Flow Sensor Open/Short To Ground. No CEL either. For example, on some vehicle applications, as soon as STFT reaches a specific limit, long-term fuel trim (LTFT) would begin to adjust and then STFT would drift back to near the zero point. A rich fuel mixture can produce more power (up to a point) but it also increases fuel consumption and emissions. 2005 dodge srt4 with 3inch CAI and 3inch exhaust wit cat well my long term fuel trim at idle is about 16. Any suggestions. The E46 M3 has a 3. Fuel trim includes short term fuel trim and long term fuel trim. Hi, Few day ago I discovered that my long term fuel trim is way off. 2% and long term fuel trim 2 was -18%. 2005 i Long Term Fuel Trim -8 at Idle. Things done so far. Short term fuel trim is on the fly fuel trim corrections. Long term fuel trim question bank 2. Additional fuel is indicated by fuel trim values that are above 0%. The GM system assigns a number between 0 and 255 to define fuel trim, with 128 being the middle point. It had a fault code of P0171 for a while and the front oxygen sensor was changed by a garage. (Bank 1 sensor 1, Bank 2 sensor 1) Long term and short term are pretty much like they say. There were no DTC codes thrown. The signal from air fuel ratio (A/F) sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the theoretical value. Occasional code P0171, lean bank one. Way too high. P1166 VOLKSWAGEN - Bank 1 Long Term Fuel Trim Range 2 Rich Upper Limits Exceeded is the common definition for the P1166 VOLKSWAGEN OBDII Code. Changed front O2 sensor. If the Long Term Fuel Trim remains around 0% with the air filter temporarily removed, there is an issue with the air filter that is causing lower than normal MAF readings. The fuel trim Diagnostic monitors the averages of Long Term and Short Term Fuel Trim. That is why you are getting terrible mileage. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short-term fuel trim compensation. High Long Term Fuel Trims - why? This is a screen shot of my Torque app after about a 20km drive. Is there any way to reset LTFT without Tech2? Mine is reading -20% after getting some garbage gas in Mexico a few weeks ago. I use Torque, OBD Fusion on my android phone and tablet to monitor short and long term fuel trims to determine if I have a lean condition or a rich condition. I own a Corsa 1. long term fuel trim. I fueled up last night, noted that in my SG, and my long term was sitting at 1 for the 15 miles to my house. Minor changes back and forth are normal and the vehicle is working normally. P0171 and P0174 will be recorded if long term trim remains roughly 10% or higher positive, meaning the ECM is ADDING fuel. It has about 100,000 miles on it. WOT throttle a bit on the rich side around 11. 00 mph I just have not got the right extender for the ratchet set to go digging into the spark plug yet p. Long Term Trim is a learned value over time which changes gradually in response to conditions such as fuel oxygen content, engine wear, air leaks, variation in fuel pressure, altitude and so on. O emissions. If the HO2S indicates a rich condition, the FT values will be below 0 percent. 21 percent is this normal or is this an indication of a vacuum leak since its trying to richen the mixture out a good amount. DTC (diagnostic trouble code) P0170. My short term numbers are -. Also the the long term fuel trim (LTFT) will also decrease at idle to below -5%. If the vehicle runs out of fuel, the air–fuel ratio is LEAN and the DTC P0171 or P0174 is recorded. The Pacifica narrowly took the victory in a recent comparison test, but an Odyssey has since joined the long-term fleet for a long-haul showdown between these two superlative minivans. Get the three readings at idle & again at 2,000 to 2,500 rpm. And just because you have +5% fuel in short-term doesn't mean it will automatically change long-term to +5% either and short-term back to zero every. So frustrating! Basic problem, for those of you who haven't been following, ECU sees air/fuel mixture as being too rich, sets negative lambdas for multiplicative trim, eventually lambda go over -15% to -25% and the fault code is thrown. I is my understanding that fuel trim should be 0 in the long term, maybe be up or down my 1 or -1, but like i said its normally in the positive. The ideal fuel trim value is around 0%. i would still like to find a way to get mt long term trims dead on like my short term is. Short term trim does bounce around a little as it should, staying close to 128 as the long term trim walks its way down mto keep it so. This means the PCM has detected a fuel trim outside the specified range set. Short Term Fuel Trim - Bank 2. short term goals goals that can be achieved in a limited period of time and frequently lead to the achievement of a long term goal. All test cars were put through long term full throttle testing in conditions varying from wet cold climates to hot dry Arizona desert temperature for safe-optimal air fuel ratios and. The LT and ST trims on your Bank 2 look just about perfect. It is more common to see P0171, 0174, 0172, 0175 codes set with regard to fuel trim malfunctions on American cars. Regards, paul. The post-cat O2 sensors seem to operate normally. You may have to register before you can post: click the register link above to proceed. Any ideas are welcome, I don't know what else to do. Sorry this is a newbie question. 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. com long term fleet I usually find that I get higher fuel economy. Do I have a fuel pump issue? What are common culprits for this?. This value is measured in percentages and can occur in the positive or negative values. There is still enough there to grasp what's going on, but much more limited in scope. While viewing data on a scan tool, you can see the HO2S actively switching and the short-term fuel trim making Figure 2 Figure 3 Figure 4 Figure 5 88seanboyle-fuel. the long term and short term fuel trim 3&4 are 32. If that's the case, you have to trace things and see where it's getting excess air, making it add fuel, or not enough fuel making it do that. Fuel trim numbers alone won't provide a complete diagnosis, but if you know what to look for, those numbers can lead you in the. 2005 dodge srt4 with 3inch CAI and 3inch exhaust wit cat well my long term fuel trim at idle is about 16. I also had a full tank of gas in the car; I threw in 3 bottles of seafoam just to be on the safe side. Multibank six-, eight-, 10-, and 12-cylinder engines often employ a separate short- and long-term fuel. Changed front O2 sensor. Changes in LTFT usually take a few seconds to be updated, and. It is stored in the DME when the key is turned off, when the engine is restarted, long term begins where it left off. Fuel Pressure Packing list: 1 * ELM327 OBD2 bluetooth diagnostic interface. The air-fuel ratio should stay at, or very near to 14. The Long Term Fuel Trim on both bank are too high ~14-20%. I WILL CUT ALL THE FRAMES AND JUST PRINT 3 HERE. Try getting some readings of Long & Short Term Fuel Trims as well as the Maf sensor. 2 SXI 53 plate, I have the P0170 Fuel trim fault bank 1 lean I have been to two seperate garages who both diagnosed the same P0170 fault but neither could pinpoint the actual problem and recommended that I bite the bullet and go to Vauxhalls themselves. I don't know much about fuel trims but from quick reading you want the numbers to be close to 0 as possible. I'm hesitant to mess around with those plugs again, searching to see if there's another gapping. maf data seems normal. Another effective test is to measure the pressure loss in the fuel rail when each injector is fired and pulses for a set period of time. OBD2 Fuel Trim Monitor: Long Term Fuel Trim Operation. We've got four pieces of data here because we have short term and long term fuel trim for both banks being that this is a V8 engine. Minor changes back and forth are normal and the vehicle is working normally. Air Flow Rate from Mass Air Flow Sensor. The amount of fuel the PCM adds or takes away is a percentage and is expressed in short term or long term fuel trims. The Short Term Fuel Trim on both bank look fine. The actual list of available parameters is vehicle specific. 4% Long term fuel trim 1 was -17. I don't have a vagcom yet (new chip=no money) but my ODB-2 does give me some freeze frame data that the ecu records at the time of the fault:. 96 cavalier 2. Such deviation will occur due to individual engine differences , wear over time and changes in the usage environment. For the BLM/Long Term Fuel Trim 155 is still within boundaries of the ECM adjustment to fuel, IIRC the max BLM in ASDU is 172. It has about 100,000 miles on it. Intake Air Temperature. B1S2 O2 Sensor Fuel Trim constantly 99. Fuel System Status 5. If both the short-term and long-term fuel trims are lean or rich beyond predetermined values, it is interpreted as a malfunction, and the ecm illuminates. Multibank six-, eight-, 10-, and 12-cylinder engines often employ a separate short- and long-term fuel. Changes in LTFT usually take a few seconds to be updated, and. Ltft or long term fuel trim the engine computer is. im showing +11. Long Term Fuel Trim. P1134 HO2S Bank 1 Sensor 1 Transition Time Switch (Bank 1 Sensor I) P1154 HO2S Bank 2 Sensor 1 Transition Time Switch (Bank 2 Sensor 1). com long term fleet I usually find that I get higher fuel economy. Clear trouble codes and turn off the MIL ("Check Engine" light) 3. If the pitchers throw is not a strike, the catcher has to reach his arm out to catch it. Producing 87 kW and 180 Nm, it was priced from $52,950 for the five-speed manual, the four-speed auto adding $1700. The next step then is to look at Long Term Fuel Trim (LTFT) percentages. It must stay at this range during idling, going down hills, cruising, and at highway speeds. A newbie here. You may have to register before you can post: click the register link above to proceed. 45, and in a short time, they warm up, dip down in voltage, and slowly climb back up, until they're really nice and warm, and then the voltages seem to correspond with the short term fuel trims I monitor. If you install an aftermarket air filter that is less restrictive than original equipment, it will affect intake airflow. Use a smoke machine to check inlet manifold vacuum leaks. They fluctuate between. If the Long Term Fuel Trim is consistently above 10%, temporarily remove the air filter element, reset the fuel trims, and evaluate the Long Term Fuel Trim. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: