After many many videos I have watched on fuel trims I never thought someone will come with a new approach. I think using the rc car is the best example I have ever seen on fuel trim. Well done. 👍

Best video out there on fuel trims! If someone can't understand this, then they are just not capable of understanding anything

I just found out that fuel pump pressure has a big influence on short trim and fuel trim correction. The lesson you gave really helped me understand this. Thank you

a decade looking for avideo like this. just can't thank you enough.

That was an awesome demonstration of fuel trims. Thank you.

You are the best of the best. I hope that most of the "auto mechanics"here in California start watching your videos so they can learn something about fuel trims

I'm going to use my old RC car to teach this to my apprentice. Great demonstration here

I wonder which institution you teach at. Without formal training I have tried to understand fuel trim through others but not everyone is possessed with the gift of imparting knowledge. You possess that ability and does so with ease. You can only explain something if you truly understand how is operates and you do. This have brought me to a better place and a better understanding of how fuel trim works. Thanks man keep up the good work. 👏

I loved the practical demonstration! Thank you.

Thank you so much! You have explained Fuel Trim, this is an Incredible Golden Nugget of Knowledge!

Extremely well presented. This video answers a multitude of questions concerning fuel trims. Using generic data to view fuel trims is not included in any diagnostic scanner's instructions. I have been plagued with trying to read fuel trims on Nissans for some time now. Thank you!👍

I liked the injector on time portion showing the computer adjusting. o2 sensor response is very critical too. Meaning a lazy o2 signal or o2 heater circuit. 👍👍

Generic OBD2 gets overlooked by a lot of guys especially once they get their hands on higher end scan tools and wind up getting themselves in trouble chasing substituted values. I use Generic OBD 2 a lot when chasing issues such as fuel trim.

Great video! I learned a lot! Thanks for taking the time to do this.

Finally, a video that open my mind on what I have considered a very hard subject to understand .

Thank you. Finally i understood LTFT. Fuel trims are important also for unmetered air issues.

Thank you for taking the time to make the video. This is really helped me gain a much better understanding on the subject.

Thanks for the video it was great! For people who study signal analysis the short term would be termed "high frequency noise" and long term would be DC offset

I already know about the theory. But the practical part is fantastic. Many thanks.

Have been very much interested in understanding fuel trims and after watching this I can now say I've got the point I've been missing thanks. This is my first time in this channel and i like it.

Wow best explanation for a beginning mechanic!

Finally, understand fuel trimming. thx

It's important to understand that the short term adjustment is always added/subtracted to/from the long term, to get the correct 'instantaneous' fuel/air balance, as seen by the O2 sensor...

Definitely the best video on this topic on KZfaq. Going to add this to my playlist. Thank you.

THIS VIDEO IS A MUST WATCH WATCH 10 TIMES. MAYBE 11. AWESOME DUDE.

Dynamic and useful explanation Thank you

One of the best explanations I've seen. Great work. Thank you.

BEING IN THE TRANSPORTATION REPAIR FIELD FOR 50 YEARS NOW AM STARTING TO UNDERSTAND FUEL TRIM PLUS THE REASON WHY THE READING ARE POS-NEG.AII THIS I KNEW I HAVE THE UNDERSTANDING,I FEEL IT THE PERSON WHO TEACHING IF YOU CANNOT GET THAT TECH TO SEE ARE UNDERSTAND WHAT YOU TRYING TO SAY. YOU ARE WASTING HIS TIME& YOUR, PLEASE KEEP-UP THE GREAT WORK, [ DADDYDAVE 707 ]

Nice analogy with the r/c car. Thanks for posting👍

Appreciate your demonstration and information about the fuel trim. Thankful to you 🙏💐

Excellent l really like the live demonstration.

Thank you very much for your well explanation. Now I have a better understanding of fuel trim than before.

Very good explanation for this old school mechanic starting out working on my own vehicles again. My son tried explaining it to me but you explained it better. Thanks

This is the best explanation about fuel trims I ever seen , and well explained, thank you Teacher

Great way of explaining this, the steering alignment analogy is very intuitive 👍

Nice explanation! I easily understand that the computer expects a certain fuel pressure and has a map of the expected injector pulse width for the flow of air into the engine, and corrects based on what’s being actually measured.

Thank you so much. I’m not a pro, but I’ve made it a goal of mine to understand fuel trims. I’m a pilot, and your airplane trim analogy did the trick. I have a low level scan tool that I’m trying to understand for my car and at least now I can get the high level overview that previously escaped me. It’s a 11 yr old 3.6 GM with 160,000 miles that seems to run quite well, but as they say knowledge is power. I subbed.

That was an amazing overview for fuel trims, keep this up 🔥🔥

That was a very good demonstration. I can see that the computer is always correcting to optimize the fuel trim. I suppose that understanding what information the computer needs to control fuel trim will be in future lessons. Thank you!🖖🏻

Great job of explaining fuel trims. I now understand exactly what’s going on with my injection and no guessing. Thanks!

😃wow, I just came across your stellar teaching on this topic of fuel trims! Bravo! Short & Long adding together and understanding how fuel pressure can impact the duty cycle of the injectors as well as all the trim. This is helping me take over the troubleshooting of a lean condition on a Cadillac engine with codes 171 and 174 (lean on banks one and two). I'm looking at fuel pressure tomorrow and your excellent teaching has put me on a path that I think i can solve it. Thank you sir. -jeff

After watching many videos, YOUR video totally put short and long term fuel trim in perspective for me, Thx

I've taught many subjects not as a profession but as a friend or mentor. From math to my son or my lady friend's child, general mechanical skills to friends & family, even Martial Arts & Self Defense. I've always had a gift for teaching from different perspectives that the student could relate with & understand. You just did that for me! Thank you so much!

This kind sir was really informative I'm here in Jamaica and I have a 2007 Suzuki Grand Vitara that's running rich in bank 2 @ -22 . I'll be looking into that injectors tomorrow thank much

Excellent video. The most concise I've seen to date. I enjoyed watching.

Great representation of fuel trims! Love the RC car and the live car example! As always great content!

The very best explanation with visuals to tie it together. Great job

Never understood it one bit before this video. Thanks alot, that was very well explained and alot of useful effort went into it

A very excellent explanation and we have benefited from the basics and we are waiting for more information.. I have subscribed to the channel and activate the bell to receive more. Thank you very much😇

This was definitely the best fuel trim video I have ever seen. I am having a problem with a P0401 code and fuel trims around -12 to -16. Very informative!

Thanks Much! Explained WELL in layman’s terms.

Man this is terrific I’m showing my junior techs this!!!

WOW FINALLY SOME ONE EXPLAIN EXACLLY WHAT THESE NUMBERS ARE DOING AND WHAT IT MEANS. THAMK YOU SIR......

This video was excellent!

Very well put together. I finally get it , Ty

Brian, AWESOME information sharing thanks.

I run a shop and will share this with an up and coming mechanic. Thank you!

What an amazing explanation of ST LT 🎉🎉 thanks

Great Info! On point. Nice and easy to follow

That was awesome and very informative

Thank you for sharing your knowledge and experience!!!

Great explanation!

Very very good video. simple and understandable. thanks.

Beautifully done, thank you sir.

I really enjoyed this very cool and simple explanation about fuel trims. Wish you had explained that to me 27 years ago! Have a wonderful New Year 2022 with family and friends. Same for all other commentators.

Best video, best information, I've found so far regarding fuel trims. Nice and clear. I especially like how Mr HoAT set up a system to reduce fuel pressure to the injectors, showed us a gauge that was indicating the pressure and the changes in pressure, and showed us how the OBD trim values changed in response to the changes in fuel pressure - changed in order to keep the vehicle at "homeostasis" as they call it in biological feedback systems. I loved the info about the etymological origin of the word "trim" - starting with how the word is used, what it means, in the context of sailing vessels. Only thing I had some difficulty understanding was the fuel injector oscillograph pattern starting at 21:20. I think the problem here was that I was not able to see the labels for the vertical and horizontal axes. The labels were too small to see. I saw what looked like 2-digit numbers on the vertical axis that were too blurry to actually read, and in addition I saw just the numbers, I did not see any label saying what the numbers were a measurement of. Whatever was on the horizontal axis was even harder for me to see. Is it time, in milliseconds, on the horizontal scale? At what frequency was the oscilloscope re-drawing the screen? What was on the vertical scale, volts? Why was an increase in injector on-time associated with a flat, horizontal line at the _bottom_ of the vertical scale (a line which got longer as the fuel trim went more positive)?

Thank you. Was a brilliant way of explaining it.

Great presentation.

Your very good teacher thank you 👍

Basic control theory. Many systems in the modern car are using a PID control loop to maintain some kind of stasis, e.g., fuel ratio, cruise speed....etc. Some of the most fun projects I ever worked on were based on this.

Fantastic tutorial ! Thanks

Excellent teaching love it and tank you

Very well done vid !!!

Very well explained!

Great video, thank you sir 👍

Absolutely fantastic explanation! Thank you

Thanks for the video. it help me a lot

That Rc car explanation was brilliant. I've never really understood short/long trim until now. Awesome explanation. Thank you for that simple but effective analogy.

Best that I have ever seen

Brilliant well explaind 👍

he is the best in this section

Thanks for the simple explanation ! Great Video !

Great teacher thanks a lot

Great job explaining fuel trim. I can tell your a good instructor! You made easy to understand why and how fuel trim works. The real time lab was a great learning tool.

excellent job

great video very helpful

Excellent video!!!

thanks verry much i learn a lot

This it’s Gold. Gracias 👍👍👍👍

This is just the best video on the internet explaining fuel trims. Thank you.

Phenomenal!🎉

Thank you !

Well done 🤗🤗🤗

Excellent

Thank you 👍

Thanks for taking your time out and teaching us. Great explanation! OBDII generic data is very user friendly then the manufacture specific when it comes to Fuel Trims.

Yes Fuel Trim is Very Complicated to understand but with the Hands-On example how about ' Controlling a Model Car You put Light in ~ a Dark Tunnel dude! 😮👏

you're the best!

This video widens my understanding on fuel trims. Thanks for making, very useful demo.

New to the channel great content.