Understanding the basics about fuel trims

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

If you can rely on the fuel trims everything is pretty simple, but I have a problem here where the fuel trim values ​​are good, but only when the air conditioning is on. If I turn the air conditioning off, the values ​​deteriorate drastically, over 10 and more in the short term and then finally also in the long term, to the point that it sets a P0130 (bank1 sensor 1 electrically faulty) code and often also a P0171 (system too lean). Why do the values ​​deteriorate so much when the air conditioning is off, doesn't make sense to me? Does anyone have any ideas about this? This way it won't pass the emissions test.

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

Very well done vid !!!

thanks 👍👍👍

Your videos are great and I want to learn. Im having a hard time navigating utube. Where do I go to get more information on the courses that you offer, there must be a website?

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!🖖🏻

I loved the practical demonstration! Thank you.

Thanks Much! Explained WELL in layman’s terms.

Hello sir .
Great video .
I’m starting watching your videos .
Question do we need to add the 2 banks to see results or just both trim at 1 bank ?
I’m sorry I didn’t get that part.
Thank you sir .

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👍

This video was excellent!

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

Excellent l really like the live demonstration.

So complicated.

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! 😮👏

Good morning, please short term positive 20 percent and long term negative 28 percent, please the meaning

♥ Thank You ♥

Not a popular way of framing it, perhaps, but an aircraft is indeed a vehicle. 😂😂😂😂😂😂

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

Great video, why was the fuel trim at +7 before you reduced the fuel pressure?

Great explanation about ST and LT fuel trims

So what causes an engine to run rich? I have LTFT in park for B1 & B2 at -14 to -18%. With STFT B1 & B2 at 0 to 4%

My ford focus has 99% on the bank 2 Long term fuel trim.. And I can tell the car is not responsive, especially if going up the hills. Is it actually possible that the car can still go on with that amount? Or is it something wrong with just the sensor and that causes the car to be unresponsive?

Awesome video I got a Foxwell NT809BT Scanner it's all setup just need more deeper understanding how to find faults Great video about fuel trim thanks

I put four new Denso fuel injectors in my Civic with the R18a, and although it runs well, the fuel trims went from negative 5-8%, to positive 4-6%. Does this tell me my new injectors are undersized?

The best "show and tell" tutorial on fuel trim I have seen, you definitely do not have to be an engineer to understand this. Thank you for taking out time to help on this.

Perfect, perfect, perfect...👋👋👋

Thank you!!!

Very informative, bro. It's greatly appreciated

Thanks for the Video
its So Easy Now
i Got it 100%
👍🏼

you kept saying add the long and short to get a total then whats the point of having a long and a short if total is what matters, i would think the most basic of basics is to know why there is a short and a long instead of just a total???

Thank you very much for this Excellent explanation!!!

Good stuff! Thanks for posting!!

excellent video. The CAR controls really helps. In my case, it seemed I had to keep clearing out codes/pending codes until the LTFT came into compliance - after a badly leaking exhaust. I seem to be on the good path now! Cheers.

Aaaaahhhhh, I see the mistake I made, I thought positive trim values meant it was REMOVING fuel and that negative values meant it was ADDING fuel..... Oops. I see why my LT trim is even farther off now. My engine runs SUPER lean now

What an awesome video! Super easy to understand. Thanks!

Thanks for the lesson.

Best vidéo i hever seen

How make freeze on short trim to stop problems in a cars 😅

Im a diy guy. Thank you so much for making this so clear and simple. I will be watching more of your videos.

Muy buen video, great! Thanks

You just gained a follower for this awesome fuel trim tutorial,thanks for teaching me and many others 😀 👍

Well it helped me a lot to understand I had some sues with a p0420 and a irregular engine running thanks to this I solved it had a bad upper o2 sensor

my LEXUS IS250 has a -15.6 long term 2. so what should i do?

You really nailed it , thank you 🌷

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. 👍