Understanding Fuel Trim by Ross-Tech
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- Опубликовано: 2 окт 2024
- Free vehicle support at forums.ross-tec...
It is important to have a good understanding of Fuel Trim. This video shows some real world examples of monitoring Fuel Trim. We also have a short article on Fuel Trim at our Wiki site:
wiki.ross-tech....
Our new HEX-NET interface was used to communicate with the vehicle wirelessly. For more information about the HEX-NET interface, please visit our website:
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A great video. It doesnt matter how many months go by i can refresh my memory with this video when working on my car. Vcds and a smoke machine are a must for VAG cars 😂
hahahahahaha WTF with Mortal Kombat's Dan Forden saying "Toasty" at 2:36? LMAO
Can you make more videos about this I'm still kind of lost.
Clearing codes (even if there is none) is clearing LTFT memory, right?
How long would it going back to normal if I would not clear codes?
Hi, very good video. I was wondering what is typical values for sensor voltage? How to detect that a sensor is going to die? I have an Audi A3 1.8lT 2001
spraying carb cleaner on your rubber hoses will deteriorate them
Can we test crankcase vent valve Passat b6 and how to test if we can, I think that he can do same problems if is blocked, do not open properly when should be opened, when the pressure is increased in the engine. 2.0 TDI 81 KW
How do I check to set if my bank 1 sensor 2 is okej?
Very nice information mate.
I have an Audi B8 A5 2.0T (2015) and trying to figure out why I have +20 percent LTFT readings. No codes. I did smoke machine test, no air leaks that I can see. PCV valve was replaced with OEM. MAF clean with brake cleaner. Fuel rail pressures fine, no misfires, no symptoms. Could it be a bad injector or two? How do I test injector with VCDS?
short term fuel fluctuates + or - around zero, and my long term steadily rises until around 25% I get a check engine light. I am stumped. 2007 vw passat 2.0T FSI. anyone have any advice? why does the long term keep rising? tia
The video basically shows you that exact example; when they remove the dip stick, the engine intakes "false air" (air that has not passed the MAF sensor in the intake right after the air filter), and thus, the engine combusts more air than it *thinks* it is. Hence the mixture gets lean and the ECU tries to correct.
While the video may not explain it extremely well, lifting the dip stick is similar to having a leaking air intake system on these engines because the crank case ventilation is performed by the intake, thus allowing the dip stick to pass false air into the engine. So when your car experiences identical symptoms, but have the dip stick seated properly, it would suggest that the engine is indeed getting "false air" like in the video, but obviously not from the dip stick as in the video. Instead, it could be a leaking air hose or a fault in the positive crank case ventilation system (PCV).
The video also shows you how to diagnose this issue by injecting something flammable (not just anything, use what they suggest) around the intake hoses. If this spraying causes the engine air/fuel mixture to change to a leaner mixture, it would indicate that the "fuel" that you're spraying into the engine bay makes it into the engine to affect the mixture. The only way it could do that, is if there's a leak in the area that you are spraying, to allow your "fuel" to make it into the inside of the air intake system. Using this method, you can locate the faulty part of the intake and replace it.
My beetle 1.9 pd is horrendous on diesel, exhaust stinks pungent. I have vcds and one of your leads. I think I have an air leak, I didn’t know how to check for one though. This explains perfectly
Would an air leak affect fuel consumption? My torsion value is 1.1, I adjusted it from -4.4 using vcds.
Ps… earlier this year I fitted a 130/150 inlet manifold, an egr delete then had a remap, I have noticed oil that has leaked from the rocker cover breather-inlet, the oil is on the inlet manifold.
Please help, thank you.
An engine with only a Map sensor cant see any vacuum leaks! Only with a Maf sensor.
So in that case the fuel trims are not helpful, to diagnose a vacuum leak.
n engine with only a Map sensor and vacuum leaks will have high idle
True, but only if the there is a large leak somewhere, small leaks doesnt cause high idle.
Group 032 and 033 are different for me.
Petrol or Diesel? This video shows for petrol engines.
😅😅
008851 - Fuel Pressure Regulator Valve (N276)
P2293 - 002 - Inadequate Performance - MIL ON, what to check hpfp is new ? Fuel pressure regulator? 1.4 tsi CAXA
Thanks for these great videos and this magnificent tool than VCDS is, im currently an VCDS Lite user but i hope to purchase soon a full version so i can use all the potential off this scan software. Once again thanks!!!
Here 033 at 1st field, lam da control B1S1 is 0,0% and there is nothing I can do for it oscillate
Hello, please can you tell me, on 32 in second box i have all the time 5.5% or even 6%, it writes Lambda partial load, that means that lambda sensor is dirty , or tired ? Best regards !
Thank you for this very instructive video!
There is still something that puzzles me, so I have a question please!.
min 2:10, very good readings for the short and long term fuel trims. But, O2 sensor voltage reading is 1.48 V. Aren't we supposed to see a fluctuating value between 0.1 and 1.0 volt?
I have the 1.8 tsi engine and channel 33 goes down to -17 and misfire cylinder 2 and 3 starts coming out, it goes to 0 a minute and no error codes come out in the engine, what could it be? The engine has lost a lot of power when starting cold it is very bad
That is very interesting. I did not realise that air like this could effect the figures and the car ECU adjust so dramatically.
I been waiting for something like...I have the ross tech vcds and with this video fuel trims make a lot more sense..
Thank you for posting this video for the none euro guys...
Well my 2011 mk6 tdi does not show that in those boxes. Guess every model is different?
So it's a bad idea to check oil dipstick while engine is running.
I have an 09 Tiguan n I’ve tryed using starter fluid to find a vac leak but I can’t find anything. But prior to getting a p0171 code my transfer pump was making a humming noise . The noise has now stoped (suspect pump died) I get the p0171 code can the transfer pump loss cause this code?
Great video! does the sensor 2 (downstream sensor) is only used for cat monitor and not for fuel trim? thanks!
Thank you so much Mark mangano dependable auto wartburg tennessee outstanding video
i guess each car has a different group number fore this info cause mine doesn't show that, mk3 aba jetta
Hi there. If my engine ECU is UDS which values should I check in the engine module advance measuring values to check for both the short term fuel trim and long term fuel trim using the VCDS? The measuring block is greyed out in UDS.
Thanks for you information, very interesting and helpful.
Hello from Argentina!
I have a 2001 vw passat 1.8t awt engine.
Yesterday i drove very well, but very kms later, start to have rough idle and run very very rich.
Lambda reading is 22,7% and change to 26,6% all the time. I change lambda sensor and nothing, the harness to ecu is okey, if I disconnect the lambda sensor, the reading is 0% and run well.
There no have vacumm leaks, spark plugs are good, no misfire readings, fuel pressure is 4 bar it´s okey.
technician guy tell me: " your ECU died"
Please help me!!!
+luis calomino Hi luis calomino, i have the same car "Passat 1.8T AWT - 2001" with the same error do you have know a answer for the Problem? plz help and answer me that we can exchange problem solving. I testet a lot with chaning parts and select with vcds diag.
+Jenny Meyer +Jenny Meyer hi!!! Do you use whatsapp??? It can be better if talk.
Sorry for my pour english!!! If the reading of maf is higher Than 4.5 g/s when the engine is at idle and the throttle its around 1.2 - 2.5 %, the engine Start to fail and the reading of lambda 22,7 and 26,6. My problem was the pvc valve, this was stuck open. Do you
Understandme? 👍🏻👍🏻👍🏻👍🏻
+Jenny Meyer my friend!!! You can solve the problem???
1.8 l 130-140k miles, On your right hand-intacte manif.-under L vacuum hose-disconn, plug it=no more rought idle. Bad Check valve[special] follow plastic line, hided down there- [Hard to see from top]
Would love to see TDI injector stabilization + injector switch time deviation video.
can this be graphed
Thanks for this excellent video, very clear info. Unfortunately when I go to group 032 and 033 no Lambda info appears, different info is displayed. I am checking using VCDS version 21.3 on a Touareg 2007 3.0TDK (BKS) any idea which group do I have to read to get the lambda info? Thank you very much in advance
This information is for gas engines and does not apply to TDI engines.
@@jef4130 thank you very much for your reply! I was completely unaware of it
my values are just at Zero. how come?
dude you needs a drink slopper chops
Don’t try this at home
Hello, is it possible to have vacum leack, the same way, as you simulate it from the oil stick, as the seal for crankcase?
Another ace video , and Paul , another one of my subscription s in the same video. Ace
dear may i ask ... how can i make EGR off on skoda 1 2002. 1600 MPI by VCD ,,,, thanks
disconnect the cable
Very usefull article , helped me alot to understand the meaning and the importance of o2 sensor
My 02 s10 2.2 stays around idle hot at 1.6 long term bank one
Starke Erklärung
Very nice demo, using the oil dipstick to introduce unmetered air!
ScannerDanner is awesome
Why STFT was around 23% but LTFT save only 3.6% ?
LTFT adapts slowly. Leaving the STFT that high will cause the LTFT to go higher as well.
Very nice video, thanks!
Thanks a lot! This really helped me :)
Great video :)
Great info.
Можно на русском?
Да в принципе всё доступно. Самое главное, что показана диагностика. И нюансы со сбросом коррекций через сброс ошибок.