Diagnosing an engine without using faultcodes

Can we diagnose an engine problem without using faultcodes?

[@johnklir3620]

Methodical approach to problem solving. Knows where to get data and how to interpret it. I love it. Keep up the great videos.

[@Diagnosedan]

Thanks John 👍👍

[@Davidhamnett]

This really does show your prowess in your line of trade, thank you Dan for everything you’re doing, helping us to learn more.

[@buddiec41]

Dan love your videos, I used to be very good at diagnosing and fixing problems with pretty much anything from cars to computers, electronics, been in the tech field all my life. Was injuried in a accident couple years ago and suffered a serious concussion and orthopedic issues that are permanent. I watch your videos and listen to your ways of diagnosis and repair to help me with my recovery thanks and continue your way of education thx

[@alext8828]

Greatest channel on earth. DiagnoseDan fixed it again, together. Points finger at screen. Fantastic.

[@FinalStopMobileAutoTech]

I recently got back from Europe, when i go back next year i would love to come visit you!!! i am from new jersey, USA. I am a HUGE fan!! Thank you soo much for what you teach!!

[@Diagnosedan]

Rene Mejia Wow thanks!🤩

[@johnjohannemann1220]

People need to be educated that’s a fault code is a symptom and not a diagnosis. Good job as always 👍🏻

[@MiteyMOofyearsAgo]

Don't Retire! We need you.

[@denziljones7881]

Dan you're the man. I viewed almost all your videos and learned so much. I love diagnostics and car mods. Unfortunately I have to make do with an entry level code reader, a home-made test lamp and a cheap multimeter. Please keep posting and diagnosing. I love your scope tool...

[@mahmoudbouafia7893]

Dude🙌 you are the Champion 🏆. 👍

[@Diagnosedan]

🤣🤣👍

[@juerbert1]

Wouldn't call Dan a 'dude' (he's not a teenager, and he's not dressed like a city slick dandy) more like a mate, buddy, pal or chum ?!

[@Diagnosedan]

@@juerbert1 😜

[@michaelproust7891]

Thanks for explaining things the others didn't, I have been waiting a long time for a diagnostitan to put closed loop and O2 sensors into context. Thankyou.

[@jamesrossmotors]

A quick check would have been to simply unplug the maf sensor. The engine would have ran on the default fuel table using tps and rpm points for fueling. I know Dan knows that. Just mentioning it for those who don't have a scope.

[@warrickarries]

Thanks James

[@TheKeenMechanic]

You are Officially KING DIAGNOSE DAN. You are such a great guy. Not a mechanic just, you are an Engineer

[@Anonymous-it5jw]

Thanks for this excellent lesson in common sense diagnostic procedure, and thanks for being very fluent in English.

[@francisemanuel6069]

Dan, I think you're the best 👌. You explain everything in detail and in that way we feel that we are doing the Diagnosis TOGETHER ❤ 💖 ♥. Thank you very much.

[@Yulian.Mladenov]

great job again. Diesel engines with EDC have the same issues,for example when no have turbo boost and no have dtc code, first check is the condition of MAP sensor.I fixed a lot of cars just after i clean the carbons and oil inside them. bravo Dan, continue with great videos. This is a very good example when one technician know the thing on the DNA level 😉. It is very important to know how to diagnose with scope.👍🏻👏

[@warrickarries]

I like this video a lot and have been watching some of the videos over and over. Thanks Dan for making me a better mec.

[@Dave-in-France]

Hi Dan, another great diagnostic video where you found not 1 but two problems - and resolved them both. Always a joy to watch your vids Dan, please continue with them.

[@Diagnosedan]

Thanks David

[@mansourtabaie2573]

Excellent teaching and presentation skill. Thanks Dan.

[@edmer4365]

Amazing analyzing skills, Love your methods.

[@spectre750]

That takes me back, too many parts fitters these days rely on fault codes. I had a 2.0 TFSi that was showing all sorts of boost fault codes. On the Skoda 2.0 TFSi the air filter box is held on by big rubber bungs. These bungs can become displaced when refitting the air filter cover and get sucked into the turbo! A really bad design fault. Once the chewed up bits of rubber were removed from the turbo, no more boost fault codes!

[@sinegra30]

Awesome! Diagnosing and fixing a car without using fault codes or changing any parts!

[@Diagnosedan]

Argeny Sandoval 😁

[@maslisko]

Greetings from the Czech Republic, owner of the same car here (just with manual transmission). I stumbled upon this video just by an accident but I am thankful for that. May I have a suggestion? Add the brand/model + engine code to the description of the video so that it can be found by other Previa/Estima/Tarago ACR3O owners :)

[@juerbert1]

Thanks, Dan ! This time two faults, one of two O2 sensors busted (internal heater filament broken), and mass air sensor clogged with dirt (air filter ok ?) ! Diagnose Dan has fixed it again !!

[@Diagnosedan]

See you next time!🤣🤣

[@smartchishaya1670]

DiagnoseDan one of the best video ever ,great well done.from zimbabwe africa

[@Diagnosedan]

Thank you!

[@smartchishaya1670]

@@Diagnosedan i have a low cost oscilloscope hantek 1008c .i am following your great knowledge ,it is really working great.very soon i will be also your teacher .thanks man cheers

[@popovlist]

Thank you very much for spending time preparing those videos. Finally start understanding more about how car system works

[@Diagnosedan]

That's great Emil!

[@djr3485]

DiagnoseDan fixed it again! I like to inspect and clean the MAF every time the air filter is replaced as a preventative measure. Many shops would never be bothered with this simple but important maintenance measure.

[@Diagnosedan]

DJ R Thats what separates you from the rest!

[@tonyarthur2828]

Thanks Dan this video was very helpful! I have been having some of the same problems with my 2003 BMW 325 XI , I wasn't sure what to look for on the fuel trims after studying for about two weeks but after watching your videos I have a better understanding 😃.

[@osc1968]

Again god job sr I like to see this kind of problems on a vehicle that some times can cause a headache but on your hands look very easy well explained another lesson to my list thank you mister thumps up

[@Diagnosedan]

Thanks for the thumbs up!

[@y22dtr1]

hello dan,first i wanna thank you for your good work!I have a passat b5.5 1.9 130 hp, it has 137 km real km, the first key in the morning the engine is galloping, shaking and gives a blue smoke . if I have a consumer, start the climate for example before giving the key everything works ok In the cold season it's all ok that's because so, I have consumers! I replaced g62 oem,no fault codes,scanned whit oem interface.thank you

[@nna6393]

Thanks Dan ! Since the garage replaced starter motor and crankshaft timing pinion the car cranking better and timing sync and fuel pressure ok . Just hope recoding the injector solves the problem . No other fault codes just P062B (downloading/configuration fault) appear Twice on the ecu global scan of The Peugeot Diagbox software .

[@mikea4341]

Nice job on that maf!

[@OilBaron100]

That explanation was really good.

[@kyhomegarage3430]

Good to see you back sir. I was wondering what happened to you. It's always good to see master at work. Cheers.

[@Diagnosedan]

i have been very bussy, Thank you

[@nigelclark7360]

Nice watching you fix these cars

[@dricklorenz9340]

Good, systematic approach.

[@Diagnosedan]

Thanks Drick!

[@frits4ever]

Learned something new again by watching this video.... You are very good ..THanks for sharing your knowledge.

[@Masso1973]

Excellent video Dan, one note to viewers, this is a clear case of uneven revving around 4000 rpm, newer engines, for example VAG engines are rev limited at full throttle while you’re parked or standing still. Don’t confuse the two situations. I have a 1.4TSI which sticks to 3500 rpm at full throttle, but even running.

[@kevinminor2558]

Thank you so Much Dan! I learned a great tip on reading wide band o2 sensor's from this video. I have always struggled with deciphering data. Now I understand what the Ratio Lambda means. Thank you. I am new to your channel and I am very impressed!

[@Diagnosedan]

Welcome, great to have you here!

[@ahmedgad7368]

This video was the frist video that I watched from your channel , you are amazing. . I will follow your channel definitely

[@Diagnosedan]

Thank you!

[@spelunkerd]

Another excellent case study. As I follow along I often pause the video and consider what I would do next. Although my first guess on listening to the engine was a plugged exhaust, the data pointed right at the MAF. As usual I didn't think of the other important cause, reduced fuel delivery from a weak pump, exposed when demand increases. In a way, this presentation is a crude reciprocal of a vac leak, in this case going lean at WOT, with secondary compensation. Thank you for walking us through another useful learning experience.

[@davidrostami1046]

Great training like always

[@Diagnosedan]

Thanks!👍👍👍👍

[@andyireland1968]

Just seen this video. Great work. Please post more videos. Thanks again.

[@600322]

It is the same phenomenon with my car.It would not rev beyond 4000 rpm unloaded with no gear engaged.It is a 3 cylinder and this is a security measure against any critical vibrations above resonant frequency.Very simple.

[@sumtech5680]

Salute Sir. Greetings from Bangladesh.

[@nna6393]

Hi Dan latest : yes there is fuel supply and cam crank sync is there . Now I have P062B (programming of the injectors not done ) I did parameter measurements through Diagbox software and the injector 1 is showing 00000 as classification code . Engine is cranking better thanks to new starter motor but not starting . No other fault codes .

[@MrBorntoroll]

watched them all... great videos! Keep them coming!

[@Diagnosedan]

Thanx for watching MrBorntoroll !

[@moetina]

Very very nice videoes Dan,first of all my thumb up and than watch the video,thank u Dan,a peace from Chechnya)

[@Diagnosedan]

Thanks!

[@ahmedsharif2074]

You deserve way more subscribers man..

[@Diagnosedan]

Ahmed Sharif Thanks!!!!😁

[@AhmedBahgat]

Indeed, unlike the other goons' channels who have zillions subscribers while their content is not as useful as Da's content

[@raviautoscanning]

Good job and lesson. Thank you.

[@princeclive1913]

You are a genius sir thanks I have learned a lot from you... May GOD bless you

[@Diagnosedan]

Thank you😊👍

[@mansorabdallah8617]

A great lesson on how to use live data and monitor the oxygen sensors and the speed sensor to show the reason for the ineffective operation of this car.. In our country (iraq), the air mass flow sensor often gets dirty due to the dusty weather. Thanks Dan! Eng. Mansor..

[@deaami6130]

You are wery good at explaining things, really good channel to just get more knowledge about car diagnosis. Only bad thing now is that i have watched allmost all the videos :D Also ppl needs mecnanics like this, the ones that really know their stuff. 1H at dan is probably better than ~3h at average dealer.

[@Diagnosedan]

Thanks!😊

[@pantelis241]

Dan you are a damn top diagnosis technician, i am blessed discovering you in my attempt path to learn more about car diagnostics. Keep up the good work 💪

[@paulwright4765]

Another great video Dan, thank you!

[@steveguest8028]

Excellent Dan,I really enjoyed this one 👍🏻

[@Diagnosedan]

Thanks Steve!

[@jdmfans6078]

i have to say the music its inspiring like I'm ready to learn... excellent job dan. keep up👍

[@vecino54]

i love to whach yor videos you are very good teacher thanks dan.

[@Diagnosedan]

Thanks for the kind words!

[@paul789]

Love your Videos Keep up the good work All the way From Oz :)

[@Diagnosedan]

paul curtis Thanks Paul for your comment! it's appreciated👍

[@Abdul_rehm7n]

Thank you sir this is so helpful I appreciate you hard work 🙂

[@Diagnosedan]

A RAHMAN Thanks!

[@0310692011]

mr dan am very happy knowing that you going to have classes about scope, please keep me notified!!!!

[@Diagnosedan]

Sure! If you Subscribe and hit the notifications bell, you'll get a notification when i upload a new video!

[@0310692011]

DiagnoseDan is there already videos about the scope? Or whats the when to start?

[@Diagnosedan]

@@0310692011 yes there are video's using the scope and more coming.

[@MrGardman]

Another great and informative video.

[@Diagnosedan]

Thank you!👍

[@mikem1014]

DAN THE MAN ... you the best Bro... love those videos

[@Diagnosedan]

Ha ha Thanks Mike!👍

[@codywichman213]

First off awesome job, I wanted to say that the test of the 02 sensor heater circuit was great. Sometimes I forget that wideband sensors use them too. I liked the use of the scope in circuit testing the maf, I personally like using the calculated engine load % to find dirty mafs. Toyota needs 90% minimum on wide open throttle. Then I would break out the scope. Anyway! Great job!

[@Diagnosedan]

Thanks Cody!

[@Eastahtata]

Those heaters are critical to A/F sensors, they won't work without it. Learned that a year ago myself.

[@sarg8833]

i know this was just for video. but Im guessing as soon as you revved it up you knew it was a bad air meter. I did. :) lots of years in the business. great videos though. learning a lot about bus systems from you. Thank you!

[@Diagnosedan]

Great comment! Thank you👍

[@jamiuajasa1683]

Good job keep it up sir,i am new to your channel,but to be honest with you I really love your explanation abt how to diagnosis a car.

[@Diagnosedan]

That's Great, Thank you!

[@valentinosgsxr]

I have to say mate, one like is not enough for this video!

[@caduceus33]

Dan, this is really good stuff! I would like to recommend something which would help me and other DIY amateurs: It would help if you explain some of your thought processes in diagnosing, such as why you decided to check the MAF, and the other system you decided needed to be checked if the MAF was not the problem. Thanks!

[@Diagnosedan]

caduceus33 In the fuel trim we could see the engine was running lean. So this means we are not getting enoug fuel, or to much air. Because the engine was not lean at idle, this was not an airleak. So only not enough fuel remains. So the engine was thinking less air was comming in ( mass air meter) or there was not enough fuel comming out of the injectors(fuel pressure) So the next thing i would have tested would have been the fuel pressure😉

[@caduceus33]

Thanks Dan, that makes a lot of sense!

[@PistonShack]

After watching your second video - subscribed for sure. Tnx for sharing useful advice!

[@Diagnosedan]

Thanks for Subscribing!😊

[@stevenkietzke5582]

Awesome job Sir

[@Diagnosedan]

Thanks Steven!

[@HasSan-jj4nl]

Tanks Dan I learn a lot from your channel.. 😇

[@dyankopetkov9056]

You do like revving it higher, don't you :D :D I've never seen such a detailed videos on youtube, great channel!

[@Diagnosedan]

😊😊👍

[@dlugas251]

Well done!

[@Diagnosedan]

dlugas251 Thank you💪👍

[@toyotoe3732]

Excellent video. Thank you. I found you because I noticed that Rob ( One Auto youtube channel) has subscribed to your channel recently. Another bonus is that I'm learning some Dutch words by reading your scan tool - for example "Korte" means short, though I doubt whether I can pronounce the word correctly.

[@Diagnosedan]

Thank you for Watching, but if you want to learn Dutch there are better channels.😂 🇳🇱🧀⚘

[@gbowne1]

theres also Google Translate and Lynda.com

[@martinbates1706]

Hi Dan love your videos keep them coming.

[@Diagnosedan]

Martin as long as you guys keep Watching!

[@billyyoder8171]

Thank you Dan.

[@Diagnosedan]

Billy Yoder Thanx

[@umarslatif]

Dan, guru big time. Thanks

[@Diagnosedan]

🤣🤣😉

[@kevinedward1234]

Dan, great video!!!!!!!!!!!!

[@Diagnosedan]

Thanks Kevin👍

[@elviscarey5270]

great job thanks for sharing

[@joemikos900]

Great video! Thank you

[@Diagnosedan]

Joe Mikos, Your Welcome!👍

[@eltayebelgorashi6553]

I like your way to explain, thanks a lot

[@shaun9067]

Good job working it out

[@Diagnosedan]

Thanks Shaun!

[@mustaphazeroual473]

Bravo thank you hello from france

[@Diagnosedan]

Merci ! Mustapha😁

[@linnie7851]

great video.

[@Diagnosedan]

Thanks linnie 👍

[@rayestrella3771]

Great work

[@nna6393]

Fantastic Dan thank you . I will do that and let you know the outcome .

[@nna6393]

Hi sorry Dan ! No comma from me for a long time . My peugeot 5008 1.6 rudimentary is running on 3 injectors and because I have used my downloaded version of the peugeot DIAGBOX windows 7 software too many times to clear the fault codes at various repair stages , now I am getting error messages . The whole engine was overhauled(new camshaft , skimmed old cylinder head , new injector seals and sleeves, new gasket , new crankshaft magnet ring , water pump all professionally fitted and torqued ) . My question is if either I programme the non firing injector with my software and if it works then also if there are still error messages popping up because of the fault code storing memory is full , I will have to take the car to the peugeot dealers to remap( whole software update ) the ecu any any other things need to be done . Please kindly advice me if this is the way to go ? Thank you so much and I wish you late Christmas greetings and a very happy new year . I have been ill since April this year and could not do much with my car . Just waiting to get better myself and for a better weather !!

[@tomaszukal5426]

Awesome Job 👍

[@PaulysAuto]

Awesome video Diag Dan, great Information on MAF's, STFT, LTFT, Widebands, and using Lambda. I have ran into a couple VW 2.0 TSI Turbocharged engines that were both setting false MAF performance codes as well as having very high Fuel Trims (lean cond) under high rpms, both with cracked intercoolers! I know that this is not the case here, just thought I'd share that information with you and others. Just wondering if you have seen similar problems like this with those European models you seem to work on over there? I love your channel, learning new stuff outside of American helps tremendously!

[@Diagnosedan]

It seems we have the same problems everywhere! Thanks for watching!

[@bohamkobi1275]

Veri nice diagnostik...😇

[@Diagnosedan]

Thanks!😊👍

[@glasser2819]

thank you for showing us what a dirty MAF does to engine controls (crazy fuel trims) - Also funny how a L4 engine gets 2x O2/lambda sensors like V6/8 engines (I guess it helps the monitoring software sanitize 1 sensor data against the 2nd upstream sensor sensor)

[@emilioc145]

Great videos Dan keep it up!

[@Diagnosedan]

Emilio Carrillo Thanks!😁

[@toddrodriguez6783]

once again awsome Sauce Dan From one Master Tech to Another 👍

[@mi60100]

Nice one here DD 👌

[@mikeanthony3986]

Great video sir.

[@Diagnosedan]

Thanks!😊

[@gharbimecatronicien576]

very very very proffesionel, i'm from algeria thanks

[@Diagnosedan]

Gharbi Mecatronicien Thank you!

[@eltayebelgorashi6553]

Amazing Thanks a lot for posting this video, by the way I am one of the most dotes of your learning contents Thanks again dear

[@Diagnosedan]

Thank you😊👍

[@MustafaMustafa-kw2ji]

Great Video as usual Dan. Thank you Mustafa Canada

[@rosendomedina8933]

thank you for share !!!! super video congratulations !

[@Diagnosedan]

Rosendo Medina thanks !😁

[@tam1381]

Dan your the man.

[@Diagnosedan]

Thank you for the Nice comment Tam, as always 👌

[@vitavas3824]

Thank you for the video.

[@Diagnosedan]

No problem!😉

[@dasouth1978]

What made you decide to go for MAF first & not fuel pressure? Thx for the video, love it!

[@Diagnosedan]

Can't remember🤣🤣 This video was some time ago i would have to watch the video. Sorry for the late reaction😊