Fuel trims explained (the easy way)

In this video i explain fuel trims in a easy and simple way.
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[@Diagnosedan]

DDTSB.COM

[@kevinbent7655]

23-03-2019 will there be any wiring diagrams?

[@SteveStavropoulos]

It would be nice if you had a low cost option for non-professionals, limiting them to info for one specific car.

[@ilcooldj]

23-03-2019

[@ar9127]

23-03-2019

[@kenfiorentini28]

23/3/19

[@abigfatelf_ttv3438]

I think the hardest part about fuel trims for most people to understand is that positive and negative relate to the fuel itself. Positive is adding FUEL and negative is taking away FUEL. When you relate it to rich and lean though it seems opposite. Rich, which is usually too much fuel, would have a negative fuel trim. Lean, which is usually not enough fuel, would be positive fuel trim. Once it clicks it becomes much easier to understand.

[@wakefieldyorkshire]

So, so true. I have just had it explained by the best and, just when i think iv'e got it! Failure again, it's the opposite of what i understand it to be.

[@jsims2985]

Well said

[@fireboy5043]

💯💯💯

[@marcelvarela3706]

Exactly!

[@richard1835]

One of the best Diagnostic Technicians on KZbin. Thumbs up for another great video.

[@Diagnosedan]

Thanks Richard 👍

[@kennyschopperz]

@@Diagnosedan He is right. Here in the states, we have Mitchell, Snap-on, and few other nation wide repair databases, but I would trust Snappy over Mitchell. I like to hear of your program, because you think unlike most mechanics, just like the rest of SOME of us. It is nice to see passion. Most guys (as you know) misdiagnose, and we have ALL had them, but to be more accurate, is ALWAYS the goal for the passionate ones. In closing, do you have database coverage for automotive platforms in the states?? Another great video, thanks!!

[@kevinsavard5998]

Dan looks for the reason with understanding the system. Throwing parts at it has never worked.

[@rogdaw7243]

Best explanation of fuel trims that I’ve run across. The background starting with carburetors and the well paced progression to modern fuel injection was just perfect! You are one of those rare individuals who can structure a lesson flawlessly. I wish that my college professors were as talented as you are!

[@jefftee448]

I know....he has very real talent in teaching.

[@khalilhood6176]

Not only did you explain it well, you presented it very thoroughly. Excellent!

[@jdubya54]

thanks Dan. I dont work on my cars a lot so reviewing your videos really helps.

[@emilschw8924]

That was the quickest and fastest shave I've ever seen! :)

[@Butlerbob]

I know a few ladies from Argentina who grow their pubic hair as soon as winter starts and as soon as spring again everything will be neat and smooth again !!

[@Diagnosedan]

The Magic of video 🤣

[@johnmehaffey9953]

Wish I knew those ladies I’d trim them free of charge

[@-doggy-6670]

It was only a trim!!

[@JohnSmith-wb6kq]

You really are a great guy Dan, great teacher and an insane amount of knowledge you have

[@Diagnosedan]

Thanks John❤️

[@gremling72]

Yet another great video from DD, love to watch them. Very clear and easy going, calm and explains well. very interesting stuff as well. Any chance you could make a short video of your tech tools, with a quick explanation of their pros and cons? Looking forward for your next video, and great to see you are doing well.

[@WisdomInExperience]

I never knew this was so simple. You really made it very simple for anyone you to understand it. I kept pushing back learning about it as I felt it may be complex

[@WouterB76]

Explaining things clear and understandable, you are doing it!

[@Diagnosedan]

Thanks!

[@OgunjobiDavid]

Thank you for this. I've been looking for explanation of these fuel trims and this just did the job perfectly well

[@Joeelectronicschematicsforauto]

I love your electronics wisdom and knowledge you are absolutely a legend

[@liviudaniel5082]

best video on fuel trim ,this time i understud this fuel trim, Thanks,God bless you,you are a treasure for this tech diagnose sector!

[@georgerocks5191]

Most basic possible explanation of trims- hardly any "meat" on the bone. Does a great job, as usual, presenting a topic and explaining it

[@felixalbion]

I am at an age where I trained on carbs and banks of carbs on cars and bikes so this is easy for me to understand. Trying to bring my knowledge up to date the hardest problem is understanding the terms. I had heard the term " fuel trim " a few times but now understand it's just what we called mixture.

[@GNX157]

On the early FI GM cars it was called block learn and integrator. Before that on the 3C carburetors the ideal number was 28-32 at idle. So many cars would come into the shop with low float levels and idle mix screws off that we’d have to do a set them up all over again. We would adjust for the 28-32 using idle mix screws and the MC solenoid upper and lower limit as well as travel distance between the two on the metering control rods. A tiny bit higher float level would help the cars have really good acceleration at full throttle when the 4 barrel secondary metering rods would get pulled up.

[@Yulian.Mladenov]

now i understand what means short and long term trim.And what is negative and positive add. Thank you again Dan 👍🏻

[@chocos901021]

very good video i am a mekanik of 3 year and this is the first time i finly understand fuel trims correct :)

[@Diagnosedan]

Great!

[@deraculandrac917]

Thank you so much DiagnoseDan! Now I can explain it to my son who is interested in taking over my place as a mechanic.

[@Peter_Riis_DK]

Are you a mechanic?

[@Diagnosedan]

That's great!

[@joaquinaguirre2976]

Thank you sir. Now I understand more how the system works. Appreciated.

[@anthonysands8846]

23-03-19 , another great video Dan can’t wait to get the tsb and watch more training videos 👍

[@Diagnosedan]

Thanks Anthony!

[@neilmanahon1485]

Thank you dan!! You explained fuel trims alot better that my instructor!

[@misterhandy5121]

23-03-19 Dan you are the MAN !!!! thanks for teaching us!!

[@fredsalter1915]

Great to see a new DD video! Thanks for the great explanation of fuel trims!!!

[@Diagnosedan]

My pleasure!

[@pieterbeukman3978]

First reg is 23-03-2019 . truly enjoyed his videos , thank Dan

[@Diagnosedan]

That's great to hear Pieter!

[@rabk5702]

Considered myself educated on fuel trim Dan your instruction where easy to follow big thumbs up :-)

[@Diagnosedan]

That's great to hear! Thanks for watching 👍

[@damienogorman9110]

Thank you for the simple explanation Dan. Car first reg on the 23/03/2019. Keep those quality videos coming please. Stay safe, stay healthy, kind regards from Galway, Ireland 😉👍

[@Diagnosedan]

I have visited Galway, i had a great time!

[@damienogorman9110]

@@Diagnosedan Next time you head this way shout out in advance 😉👍

[@MatrixTheme]

Hi Dan! Thank you for posting such a great and educational content! I wish you very best and for your family! One idea for video topic - Car electric schemes and how to read them/approach them.

[@Diagnosedan]

Thanks for you comment 👍 i've got a long to do list and i'll add wiring diagrams to that!

[@eugenel4394]

First registr.date: 23-03-2019 Great service you have created, Dan! Always big thanks for educational videos, they are fantastic. One thing I wanted to suggest: DDTSB is meant for shops with various clientele to help with diagnosis and tech support. It would be great if there was a limited subscription to DDTSB for us home users and DIY'ers. We may not need access to immediate tech support, but educational videos as well as access to things to help us diagnose our own cars would be immensely helpful. And we will also be contributing something to this great system. Thanks again!

[@Diagnosedan]

Thanks for the feedback, but we have desided not to do this.

[@georgialtanov4561]

23.03.2019...thanks again for your work. The day starts great with your video.

[@Diagnosedan]

That's great to hear!

[@michaelmunro774]

23/03/19. Another amazing video, I have learnt so much from watching these great videos you make, thank you.

[@Diagnosedan]

That's great to hear Michael

[@htownblue11]

23-03-19.....Love the explanation DD! Fuel trim understanding is so critical to good diagnosis these days.

[@Diagnosedan]

You are right!

[@martinwatson9610]

Yesterday the Date of First Registration on the DD-TSB Demo was 23/03/2019. Today the DD-TSB Demo version is showing a First Registration Date of 27/03/2019. So, I am going with the date showing today - 27/03/2019. Thanks for the incredible contributions you are making to the automotive community. Hope DDTSB will be a huge success, you certainly deserve it to be. I wish you all the best.

[@Diagnosedan]

Thanks Martin!

[@Hitman-ds1ei]

Brilliant lesson, keeping an open mind is always key, in the 90 s a customer complained about poor fuel economy on a vehicle under warranty, it was also factory dual fuel, (LPG) after checking fuel trims there was no evidence of excessive fuel consumption on petrol, but having faith in customer it turned out OEM was allowing petrol to be injected whilst on LPG TO cool the cylinders and exhaust valves but it did not show and there was no technical release of this in any literature, only after my persistent harassing the tech support did they admit to it and release a TSB stating this

[@Diagnosedan]

Great job!

[@humbertocorado5750]

Dan you are best of the best you deserve a million subscribers very soon you be there your experience and clear explanation is very clear

[@mansorabdallah8617]

I caught the mouse! Understanding the fuel trim is the basis for the correct diagnosis of automotive engine malfunctions. This mouse confused me so much! Thanks Dan.

[@giannisafaloniatis3747]

27-03-2019 Keep going with all these nice training videos. Greetings from Greece!

[@Diagnosedan]

Thanks!

[@richardcranium5839]

nice explanation dan. remember folks if you are going off what the computer says make sure the o2's are working correctly first. been bit by this before.

[@Diagnosedan]

You are right Richard! 👍👍

[@ototechchannel9923]

I love you ..mr.dan .. I learned a lot through the videos that you make on the KZbin .Thank you . Im from iraq .

[@Diagnosedan]

My pleasure!

[@SerbanCMusca-ut8ny]

Very clear explanation, thank you for that! I was wondering since yet some time what short-term & long-term fuel trim referred to. Enjoyed the reference to a carburetor, though imho most carburetors were somewhat more tricky to adjust than in your exemple. I was wondering whether the short-term & long-term fuel trim idea also applies to diesel engines (I guess yes) and how to look for it with VCDS (say on a 1.4l diesel 9N3 Polo). If you or someone else here has the answer, please let me know. Once again thank you for the quality content and for educating me!

[@Diagnosedan]

Thanks for watching Serban

[@JusttRelaxx]

The fuel trims are one of the most helpful diagnostic values!

[@Diagnosedan]

You are right!

[@APSuk2]

23.03.2019 Another superb video Dan, great to have you back.

[@Diagnosedan]

Thanks and great to see you here again

[@manishgaikwad1659]

Thank you for clear my doubts about fuel trims

[@stacyg3802]

First reg is 23-03-2019. You the man, Dan!

[@Diagnosedan]

Thanks!

[@dimisrambodimisrambo7285]

MY DEAR FRIEND, WE WISH CHRIST IS RISEN AND EVERY FAMILY HAPPINESS. I AM AN ENGINEER FROM GREECE AND I WATCH YOUR VIDEOS.YOU HAVE REALLY HELPED ME VERY MUCH IN THE DIAGNOSIS OF TROUBLES. CONTINUE TO GIVE US YOUR KNOWLEDGEI WILL WATCH YOUR VIDEOS WITH CARE. SORRY BUT I DO NOT SPEAK ENGLISH SO I TRANSLATE MY TEXTS .CONTINUE THE GOOD WORK YOU ARE DOING. THANK YOU VERY MUCH. DIMITRIS GREECE.

[@3rblitz]

the date is 23/03/19, Best automotive repair videos on YT! thank you Dan!

[@colombia555]

Always learn so much in this channel 🙌🏼🙌🏼🙌🏼🙌🏼

[@Diagnosedan]

That's great, that's what i love to hear!

[@NiTiNPatil-rj6fm]

23/03/2019 23rd September 2019 is the date of registration of the vehicle. Great video DAN. You are an encyclopaedia.

[@Diagnosedan]

🤣Thanks!

[@wyattoneable]

You're doing great work Dan.

[@Diagnosedan]

Thanks! Great to see you here again!

[@cullenmiller8170]

Thanks from across the pond for the great explanation.

[@Diagnosedan]

Thank you very much 👍

[@mil7onautodiagnostics633]

already waiting for it!

[@Diagnosedan]

Thank you 💪

[@nickk1658]

Odd, I get a different date from others: 17/04/2019. Anyway, another great video! Fuel trim analysis is so powerful.

[@IAMNOSLEEP]

Thanks for sharing Dan... Wish you the best of success with DDTSB. Cheers.

[@Diagnosedan]

Thank you very much 👍

[@jackc7084]

Another great video Dan, keep up the good work!

[@Diagnosedan]

Thanks Jack!

[@filipjazo1272]

23.3.2019. Ty man, learning so much.

[@carlosmaurencig6763]

Great video, Danny!

[@jamesu]

Thanks for the video Dan!

[@Diagnosedan]

😁👍

[@GHOOGLEMALE]

23/03/2019 - Diagnose Dan Des it again - Great vid Dan - Nice to see you again

[@Diagnosedan]

Thanks for watching and good luck with the giveaway!

[@AMG-MERCEDES]

You deserve millions of subscribers and likes. 👍🏻 First registration 23/03/2019

[@Diagnosedan]

Thanks!

[@alphaomega8373]

Bless your heart for this video good sir!

[@Diagnosedan]

Thank you!

[@mikeanthony3986]

Thank you for sharing. Great video.

[@Diagnosedan]

Thanks for watching Mike!

[@hb5914]

Dan, you had an excellent explanation of this subject. What parts would increase the fuel economy more? replacing all four oxygen sensors or replacing the I.A.C.(Idle Air Control)valve and T.P.S.? the vehicle is a 2001 Chevrolet Express 3500 5.7L. Thank you

[@alejandrobastidas7775]

You couldn’t have been clearer. After this video I have a better of picture of what my car is going through. Thank you

[@EE-hk8iu]

So excited seeing a new video of yours

[@Diagnosedan]

Thank you!

[@pontiacsrule8761]

Your a great teacher Dan as always

[@Diagnosedan]

Thank you

[@shanelloyd8366]

Trim that Dans the man. Yip another great video Dan simple and to the point.

[@Diagnosedan]

Thanks Shane!

[@jempoof]

Diagnose Dan = The Man. Your DDTSB sounds really good.

[@isalmankhan1]

Thanks for sharing Dan👍 Great video, Stay Safe Bro👍

[@Diagnosedan]

Thanks!

[@kendom33]

Great training video Dan

[@Ralf767]

First reg. date 01-05-2019 Thanks for your great job. You are awesome 👍🏻

[@Stick3186]

This was so helpful. Thank you for this video.

[@timowallin8020]

Nice one! To add this as you say you work mostly on EU cars you could add the VAG way of showing Idel and Parcel fuel trims, with specified and Actual lambda numpers. For example today i fixed P2187 (System too lean at Idle) +25% idel mixture and actual lambda was still 1.190 on idel with specified of 1.000. Breathervalve drop the numbers to +4,6% and lambda to 1.000 at idle. ..After test run car had passed all its EOBD readyness test fully, without any errors.

[@Diagnosedan]

Great fix! Of course we have a bulletin for this in DDTSB

[@timowallin8020]

@@Diagnosedan I may try it as my self before i "Sell it to my Boss's" so what is the VAT? is it 1% 10% 19 % 24% 50%....?

[@abdulh9687]

Great video, Thank you, I hope to be as good as you one day!

[@Diagnosedan]

Thanks!

[@mikejederian7164]

Eerste inschrijving vond plaats op 23/03/2019 Geweldige video's, Heel erg bedankt, je bent de beste.

[@gjh1969ify]

23-03-2019 Brilliant channel, keep those videos coming please. 👍

[@Diagnosedan]

No problem Graham!

[@rdflo6739]

Thanks again Dan!! Nice explaination

[@Diagnosedan]

Thanks for watching

[@AutomotiveServiceExcellence]

Great job!!!

[@chrisrainville6324]

23-03-19,Dan is the man!!!! Best regards,from New Hampshire,USA!

[@Diagnosedan]

Thanks Chris and good luck with the giveaway!

[@MERCEDESBENZ63]

23-03-2019 Thank you Dan for your videos ❤️

[@Diagnosedan]

😁👍

[@anthonyxuereb792]

Good to see the engine control module doing it's job like it was programmed to do.

[@arditk5385]

23/3/2019 registration date. Congrats on DDTSB Dan!

[@Diagnosedan]

Thanks!

[@kalleeriksson4830]

23-03-2019 Nice work with the DDTSB!!

[@Diagnosedan]

Thanks Kalle!

[@ozzstars_cars]

Good info Dan.

[@Diagnosedan]

Thanks Glen😘

[@odishoodisho4904]

Great as always Dan

[@Diagnosedan]

Thanks!

[@sinegra30]

Thank you Danny!

[@Diagnosedan]

Great to see you here again!

[@Poanoofd]

hi dan , i like your videos and the work you put in. I'm always thinking about getting ddtsb but since i just started a year ago this kind of money is hard to get. But it can really help grow. a free year would be a great help.

[@Diagnosedan]

I hope you win but if you don't remember that i'm sure DDTSB won't cost but make you money! You use considerably less time to find faults and replace a lot less parts that won't fix your problem

[@Poanoofd]

@@Diagnosedan thanks dan. I know , and you're right. But i already have haynes and autodata at the moment. Wich provides other data too. So 3 will be expensive. I need to grow a little more.

[@skillz1855]

Great stuff Dan

[@johngoard8272]

Hiyya Dan Mate I have "trimmed" carburettors so many times when I was in my teens and early twenties and in a way I miss being able to tinker. But a very good video Dan I really was interested in something that until now went over my head. Just out of curiosity what would a partially blocked injector affect the engine fuel trim readout?

[@nickhibberd8254]

Registration date is 23-03-2019. Thanks for all your clear and informative videos.

[@Diagnosedan]

Thanks Nick

[@el3ctr0nbelgium]

23/03/2019. Thank you for all Your work !

[@Diagnosedan]

My pleasure 👍

[@vonvoyage14]

Another great video! Just a question: Do long term fuel trims reset when vehicle is shut off? or when battery disconnected?

[@James-fs4rn]

👍ddtsb. What a plethora of information

[@armyvet92]

Awesome vid. DAN is the MAN !!!

[@Diagnosedan]

Thanks!

[@Weird-cars-problem]

Thank you, for lots of help😊

[@hieule-pr6lh]

great video, thank you dan

[@UKRaj93]

Great video

[@LiverpoolReject]

23/03/2019 thank you that was incredibly clear!

[@Diagnosedan]

Thanks!

[@likezdislike]

Hi Dan, is there a fuel trim for diesel engines? and what should be the normal reading for short and long term trim for diesel if they have?

[@jimmcgettigan1326]

Great tutorial.

[@Diagnosedan]

Thanks!