GMC YUKON MISFIRE, SHAKING, AND STALLS

[@appatula]

Having experience, a scope, and knowing your test methods/waveforms really gives you a huge advantage over guessing. A proficient diagnostic technician has the ability to test and confirm a problem without having to pull anything major apart, at least 99% of the time. Having the customer stuck paying for the "parts cannon approach" is why mechanics have a bad reputation 9 times out of 10. It seems to be a culture that dealers and shade tree mechanics have created, which is what gives guys like this a very rewarding and well paying job. Moral of the story; It gives us good technicians (with a scope) x-ray vision in a way.

[@timothycooney986]

I really like this guy - incredibly knowledgeable, methodical, efficient...and humble.

[@scientist100]

Good job Mario. Thank you for taking the time to show us your diag process.

[@Jpilgrim30]

My buddies 15 Yukon 6.2l broke an intake valve spring on #6. I took off the valve cover and noticed the valve stem was a good 1/4” higher than the rest. The keepers were laying in the corner of the head. Took off the head to find the valve had dropped and gotten bent then the piston hit it again breaking the valve off and pushing it sideways into the intake valve port. The piston had a slight mark in it but was ok other than that. Turned the engine over to see that the piston came up to the deck at the same height as the rest of the cylinders so we took a chance with a good used head and that thing ran like a champ when we got done. I couldn’t believe it didn’t put a hole in that piston or something. He got SO lucky! Had that been my engine it would’ve certainly been toast for sure! Should’ve recorded it but I did get a couple of pics of the head. 😂

[@edwinlomonacofoolsend]

I've been watching this and other channels too long. Lol. Everything you did in the order you did them is exactly what I do. Thank you for helping the industry as a whole.

[@appatula]

Giving mechanics and the industry as a whole a good reputation again, one car at a time! Shops, dealers, even schools, need to start investing in or requiring good diagnostics curriculum for their employees. The industry changed over 30 years ago. Nowadays, the tools like scopes have gotten to a point where they should be a mandatory tool that mechanics need to learn. Along with simple DMM, testlighting, and backprobing diagnostic procedures. VERY little is mechanical anymore, it's a maze of electronics, electrical motors, valves, sensors, and modules; it has been for years! No wonder so many people no longer trust mechanics. Way too many parts cannon guys...let alone dealers out there, running up the bill on people. It's just not effective, let alone honest or fair to the customer.

[@edwinlomonacofoolsend]

@appatula Agreed. The industry is in a catch 22. The real way you fix this is by implementing government regulation. Just like being a doctor. Any kind of licensed physician. But by the same token government intervention is the last thing you want from other perspectives. Someone like Ivan wouldn't exist. Because he would be considered practicing unlicensed medicine. But you've also got all these shops and techs, including stealerships, just under trained and not incentivised to care. There's no direct path to success for a young tech. And there's no accountability for shops. If you take a close look at healthcare you'll see that there's no accountability there either. Unfortunately I'm not sure I see a solution other than to just be good at what you do. And hope that you find a place that understands your worth and will pay you good for it. Or to start your own business like Ivan has.

[@bobt688]

I love watching diagnostics. Better than watching a brake job.

[@originaltim82]

@SuperMario You deserve waaay more subs for your content. No nonsense, straight to the facts ! Keep it up !

[@agl6183]

For that year, it's right under the exhaust manifold on the driver's side. The knock sensor that is. Easy repair.

[@mikechiodetti4482]

What you did was perfect diagnosing! When you zoomed on the valve springs you could actually see the broken spring before you rotated it. NICE! Hopefully the valve wasn't damaged and will now go the distance. Good One Mario!

[@crasher88]

always love seeing the waveform from the intake manifold. Still trying to learn how to interpret whats on the screen but every example it a time to learn.

[@gremling72]

Yet another brilliant movie from one of the best. Explains extremely well, humble, plesent skillful. I like, and learn, from every single one. Thanks a lot. Gremling

[@OneManOnFire]

This is the type of mechanic I would gladly pay to exactly know the issue.

[@ThunderbirdRocket]

Excellent lesson ! Fast diagnostic process !! Yep 👍🏼 …. High skilled strategies !!!!

[@High_Tech_Mountain]

Always appreciate you taking the time and making these informational videos brother!!! Even more now that you’re busier! Thank you!

[@djosbun]

Excellent walk-through. Mario!

[@MMAunderbelly]

Good info. I had one the other day that confirmed a compression issue with a relative comp test and it wouldn’t idle/stumbled and stalled. Customer didn’t want to go any further with diag so I wasn’t able to find out what the cause was. The intake valve skewing the maf screwing with the idle would make sense.

[@EverythingMechanic]

Good job Mario, the knock sensor are on the lower short block on this model

[@jonathansirimarco6215]

Gracias Mario ☺️ excelente video👏. Un saludo 🤗 desde Argentina 🇦🇷

[@pmgear]

I did not follow 100% how he scoped the car, has Mario put out a vid where he focuses more on the scoping procedure, he referenced it I think in the video. You also hear on the crank that there is some kind of compression problem, but the analysis to get to the spring was what I would like to dig deeper into. Thanks for posting!

[@somerandomguy3868]

Your information presentation has really come a long way, great video

[@mikejr550]

Very nice Diagnosis. I appreciate the explanation of your waveforms.

[@advancedleveldiagnostics]

Great diag, Thanks for sharing! I appreciate you saying that you don't memorize firing orders. Why fill your your head up with stuff that you can look up in 5 minutes. I see Techs trying to diag without a diagram and taking forever because it's diff than they think. If your already paying for service info, do yourself a favor and use it! Sorry for the rant. 😀

[@jeremyah78]

So fluid bro! I’m going to sit here and reflect on that intake pulse now! Lol

[@carelectricaldiagrepair919]

Super professional 👏 I like your approach on diagnose thanks for sharing your experience ❤

[@tuber4tuber]

Sent here from the Pine Hollow auto diagnostics channel. Ivan is great at his job.

[@petar443]

6:10 Why is the intake pulse for bad cylinder 8 higher on exhaust stroke than the compression stroke? Exhaust pressure entering intake during valve overlap?

[@mag1vl]

Hello Mario from Australia 🙃 Great work buddy and straight forward, been viewing since Ivan put us on to your great work..

[@Daniel-xb4yb]

Thanks for showing us the diag!!

[@jordanboulay3780]

totally agree with you finding why misfire happening, customers paying a minimum fee for diag and if your still in the first hour its only fair you find out why… especially where you live, a old suv is likely worth fixing down in florida where your from, but where some of us are-the rust belt they arent fixable

[@stanfordwelchut8233]

Hey I got a question. Hopefully you have time to answer this question. If you care to this close how you have the software for most vehicles you wrk on. How do get them. My scan tool is think car

[@Foreseeable1]

I put a teaspoon of oil in the cylinder, if the pressure goes up it's the rings and if there is no change it's the valves.

[@travissheehan6082]

Wow nice diagnosis. Very good.

[@bartscave]

Thanks for sharing Mario!

[@paulpaquette1961]

Nice one Mario, following the Data!

[@martinezautodiag1670]

Great diagnostic and thanks for the explanation.

[@roxanneabbott8424]

Mario where have you been? Please do more videos! I love learning from you!!

[@charliesolorzano8457]

Great video 👍 wondering if it was a piston ring leak would you be able to tell by using the pulse sensor? Thanks

[@codywichman213]

Im hoping you have time to do a more indepth video with the intake pulse testing. Maybe some examples are what we are looking at/for

[@DioguardiAS]

We had a broken valve spring on an escalade with the 6.2L. It was an intake valve as well, it got so hot it melted the plenum and created such a bad vacuum leak. Kept setting an 02 sensor code. couldn't believe the damage it did to the plenum though.

[@heythisbemyusername]

Awesome video. Can you explain more on why there is the secondary larger increase in intake pulse during the exhaust stroke of the suspect cylinder?

[@gautorepair]

Excellent diag bro. 👍👍

[@isalmankhan1]

Great work as usual😍 Thanks for sharing BRO😍

[@DTEAuto]

Thanks again for the good content as always.

[@earlyriser5877]

Great video 👍 ! Never would've thought of that

[@dolcelala]

If you do the knocks, sensors, and harnesses. Build a dam around the port or rtv before you put the new plug pushed down 😉

[@fastbagel]

Awesome as always, did you custom make the cable for your amp clamp? I’d like to do that to mine

[@robertmobileman8304]

Great diag Mario , thanks , good job

[@DmitriM.-sx7dh]

Was the green voltage reading the from the MAP sensor?

[@robertrupa9143]

what probe for current should i use? I've got Rigol ds1054. Original probes are very pricy. can you recommend something for hobbies? BTW, Great Content ;)

[@E99584]

Do you have anymore vids on doing an intake pulse test?

[@jorgegonzalez-bk8zn]

The one thing more difficult is to do a diagnosis without being interrupted,I'm finding it very difficult to do those tests when you have a few people around

[@Doug....]

Very satisfying 👍👍

[@wagoosh78]

was there any lifter noise ? loose rocker ticking ?

[@secretsquirrel9722]

You doing ok man? I really miss your uploads but you don't seem to be your usual upbeat self and mentioned you're finding it difficult to pick up the camera. Is it the trade or just filming? I appreciate anything you put out anyway. I have learned loads off you!!!

[@AyOub-wg2oz]

Keep up the good work sir 💯

[@neverstoplearning382]

Great job Mario. Take care.

[@alexross2682]

You da man. Thanks for the lesson maestro. Do you have any experience with autel ultra and what tool do you recommend for a scanner with a built in scope? Thanks broskie

[@Heretic_Dezign]

I'm sorry you are struggling to film content, as your videos are super informant

[@sonofmontezuma3732]

Ok how long has it been since I seen his videos? Because when did he get his custom shirt?? Flexing hard there Mario!!

[@miguelito6915]

Fast and to the point , great job

[@MichaelBennett-ru2nu]

Thanks New to scope for intake pulse test. How?

[@onegreat703]

Where did you put your leads to find graph information??

[@gerardocruz4779]

I took my truck to a paisas Mexican mechanic shop and they did was swap plugs and ignition coils and erased a code and said if it comes back it’s the lifters what do you think about that

[@oldbiker9739]

good info bro

[@kyletuttle9064]

Cool video thanks for sharing

[@aymenmohamed1134]

Awesome

[@dougbackstein2937]

Usually when I found the problem like this I suggest changing all the valves

[@johnnyramirez9082]

Bad ass Diag

[@BeADad2447]

Good video!

[@Jesseleegrayson]

how much would this cost on avg?

[@buscuttbutchie]

I need your help super mario. I have a 2007 GMC Yukon 6.2 V8 with code P0300 plus the smell of gas when the engine is running. Any advice. Where are you located can I bring the car in?

[@SuperMarioDiagnostics]

I’m in Ft. Lauderdale FL Without testing, we’d just be guessing honestly

[@buscuttbutchie]

Thanks for the quick response bro. I appreciate the honesty. I'm here in Brooklyn New York with nothing but scam artist everybody telling me everything from I need a new engine to I need new heads when I'm sure such is not the case because I did a compression test myself and the compression was good on all except for one cylinder which was still okay but not preferable. Any good diagnostic mechanics you know and the New York / Long Island area?

[@Steve-sq4qn]

Yup I paid 5k for pepboys to NOT find the problem lo😂😢l

[@snoopyshea]

TY SMD!!!!!!!!!!!!!!!!!!!!

[@user-vu7yt8pm4p]

I know your channel is for the technician community, but I'm not a technician. I would like you to show where you actually connected your leads, and then explain the graphs on your screen in more detail. You are just assuming everyone understands the graphs already. I know this would add time to your videos, but I think it would attract more non-technician subscribers like me. That's what is so good about South Main Auto and Pine Hollow Auto KZbin channels.

[@SuperMarioDiagnostics]

I have many other videos that show all of the setup

[@user-vu7yt8pm4p]

@@SuperMarioDiagnostics Just bear in mind that a new visitor to your channel will start with the latest videos and work backwards. They won't start with the first video 5 years ago and work forward.

[@SuperMarioDiagnostics]

@@user-vu7yt8pm4p the ones who truly care to learn will I put a LOT of info Most of the general public just wants the quick answer to their problem But those who care enough will look

[@user-vu7yt8pm4p]

@@SuperMarioDiagnostics I'm just trying to give you the point of view of someone who watches for the entertainment of the problem solving.

[@SuperMarioDiagnostics]

@@user-vu7yt8pm4p I’m ok with my channel being geared towards technicians. That’s the intent

[@kyletuttle9064]

One of the best diag guys on utube.thanks Mario.

[@kyletuttle9064]

Cool video thanks for sharing.