Diagnose a Misfire LIKE A BOSS (DIY vs "Pro" Mechanic!) 

Man, I wish I lived close to this guy so I could pay him to work on my car. What a great mechanic & a cool channel.

Got a cylinder 1 misfire on a 2010 challeneger v6, your videos really help me become a better technician and make sure I get the diagnosis right the first time. I'm definitely going to thoroughly test everything before just throwing plugs at it or something it's what my customer deserves. Thank you for these videos man I'm a huge fan of you work. I find the actual diagnosing part not only necessary, but extremely fun and engaging.

Matt, I greatly appreciate your gift for teaching and explaining the way things work, and how to properly diagnose problems. It’s good to know the “why” and not just the “how”. You don’t simply “shoot a parts cannon” at the problem. Your time and effort to provide information on this channel is exemplary. Thank you for all you do!

Thanks for the shoutout, Matt. You showed another quality diagnostic video, what we're all looking for. The lean pattern jumped out with a snap throttle, great case.

Another great example of how science wins the day and clearly shown through your methodology. It was nice to see your dedication to the two channels at the beginning; a thoughtful touch. I’ll be sure to follow the links to their sites. Many thanks Matt.

Great info here! I learned a lot from this guy, so whenever possible, i watch the ads to at least give back to this helpful friend.

Okay good one Matt! Glad to see you're excited and ready to go with the new channel.

Fantastic video as always Matt, loved that you can see a fuel issue using the scope I didn’t know that! Cheers.

Nicely done Matt . Two terrific mentions and congrats on 100K , you have put in lots of hard work and have had lots of fun along the way too . Cheers 👍👍

I, for one, very much enjoy scope based diagnostics, which i appreciate you doing matt. It covers everything, you can see the coil operating well, the oscillations at the beginning of the dwell segment and also at the end of the firing line. And the importance of establishing a baseline. Those are absolutely fundamental to secondary ignition waveform diagnosis. Keep em coming, great stuff. Maybe you'll indulge us to more scope based diagnostics, current ramping, primary and secondary waveform diagnostics, and maybe even in cylinder transducer compression waveform for those mechanical issues. It's be inferesting to see more of your take on these approaches.

Great diagnosis Matt. To the point and no BS 😁 Thx! 👍

Loved this video. Great method of diagnosis by process of elimination and logical reasoning. Brilliantly done. I don't think anyone should have to pay a professional who's method of diagnosis is throwing parts at the problem and hoping. Anyone can do that. You pay a pro because they have the equipment but more importantly the skills and brainpower to identify and the positively isolate the problem first time. That's their trade after all. If a pro replaced 4 spark plugs and all the wires and the car is still mis-firing, why should they be paid? Mechanics are hella expensive.

COOL! All this stuff new to me. I like your confidence and explanation. A good teacher, one who know s the subject, makes teaching understandable to us tyros. Thank you.

I have a misfire on #3 Mecanico replace spark plugs and coils; and nothing changed, I took the car to my house and this was a great profesional information.!! Thank you , you have your self a new follower.! I’m going to check injectors next…😀

Awesome video! This mechanic is a expert and explains things clearly !

Awesome channel keeps what learned fresh and picking up new knowledge.

This is the type of professional work people need at shops. Great video thank you!!!

That was a great shout out for some exceptional channels. Now back to the video...

Thx for being yourself.. one of the genuine folks out there

Checking the coil that way would have saved me a trip to the part store and about an hour and a half laying comfortably across my grill and air box last night

As Einstein once said "If you can't explain it to a six year old, you don't understand it yourself". Well Matt, you certainly understand what you're doing because I'm as green as it gets with auto fuel/electrical systems, and I understood everything you did. Exemplary Job!

Nice video bro thank you makes it easy to understand your method of diagnosis! Great to the point diag

Brother! Gratitude, love and appreciation. Perfect example being the change we want to see.

You're a mechanic people could trust you with their cars. Good job.

Fantastic as always Matt!

Needed this today. Great video and as always thank you for doing these and walking us through this...

Good work Matt! Looking forward to joining the new channel.

Awesome little learning gem & excellent coaching ! I’m binge watching ! 😃 Feeding the hunger ! Thanks !!

In the beginning I thought I wasn’t gonna learn a thing. Yeah this dude is smart as shit. I’m impressed. Subscribed

I have a 2000 Dodge Durango with the 4.7L v8. I had a single cylinder misfire on #1. I tested the resistance on the all the ignition coils and fuel injectors as well as the voltages on the harness. Voltage was good, but i went to do a continuity test on #1 injector, it was completely dead. I had an open circuit. I suspected it as i had a check engine light for cylinder 1 fuel injector circuit. I tested it because i didn't know if it was the injector or the voltage.

This video was the straw that broke the camels back for me. Thought I could avoid it for years but my jaw dropped when watching this one. I went and joined the pay channel. I would love to be this fluid, dynamic and precise with auto troubleshooting.

Anytime I've run across a single cylinder misfire, I've always swapped coils with an adjacent cylinder to see if the misfire follows the coil or not before deciding that the coil is suspect. Learned a different, more efficient way today, thank you! Also, feel the need for an oscilloscope!

Today is the first video I saw, and right away I have subscribed your channel.

Good information man ! Helpful for a growing diy guy

Love the shirt, only from a scientist! Oh yeah, great video too!

'Yeah, I meant the coil in the injector was bad'. Great video Matt, looking forward to the pay channel.

this is a really good video! people like this guy are genius appreciate the video!

Awesome. Can't wait to learn more. Thank you for your work and channel.

Thank you for this video, as i have exhausted all my other options. Because I too just throw coils and plugs to fix this in the past.

Nice work Matt! Super common on these GM's.

Love the channel. Checking the injector eliminates poor terminal tension between injector and connector, nothing like having a comeback a week later on something you were positive about.

Thanks Matt for another fine video.

Great video, great knowledge!

This freakin Dude is awesome. He's a trip. Featuring old school with new school applications.

Hey nice find there Matt. Like a boss!

I just learned so much I think my head exploded all you need is a little product awareness logical and you rock man you just rock thank you so much

I have a 2014 Dodge Grand Caravan SXT in the repair shop as I’m writing this for a Cylinder 5 misfire which is not intermittent, you can feel it at idle but not so much when driving. The shop replaced the fuel injector because the ohms reading was 3.6 compared to the 3.0 on the others they suspected a bad spray pattern could be the fault. That didn’t solve the problem. Next they removed the valve cover to inspect the camshafts and lifters they claimed that this particular engine has a high failure rate. All the lifters, camshafts and springs appeared fine, they used borescope to inspect the valves and no damage was found. They reassembled and test drove the van and they say misfire disappeared after hard driving and said that indicates carbon buildup on the valves causing the misfire. They did a carbon of the van with a “BG” product. They test drove the van and said all was good. I picked up the van and after just about two miles the check engine lamp came on and I stopped the van and plugged in my basic check engine tool and it had the same P0305 code! Now the shop is telling me that the cylinder head may be bad and needs to be sent to a machine shop for inspection and repair. I’ve lost all confidence that they can fix the root problem at this point so I need a second opinion. Do you think this cylinder head could be the problem? P.S. I forgot to mention they did a leak down test on the #5 cylinder and it passed, and said valves were sealing.

Good Job Matt. Looking forward to your new channel

Thanks for this super video :) I'm ready to your new webside from Copenhagen Denmark

Great demonstration.

I just want to thank you for taking the time to teach the average guy to get us to the next level

Great Video very informative

Matt, long time fan, lurker, and borderline on Quantum Mekanix. I DO really like your methods. I have the same truck, same motor. This might tip me over to being a paid sub to QM. Enjoyed your vid. Thank you!

That is so cool to mention those guys. Both have awesome channels. Now as Wyatt said, back to the video!

You always talk sense it makes you wonder how the “professionals” cope at all, keep up the good work 👍

Thank you. Great information. Learned more on this video then my AUTO CLASS

Nice video. Might want to mention though that it can be harmful to use test lights with low impedance on computer circuits. That's why I just like to use my multimeter. They do make high impedance test lights though.

THEY'RE BOTH GREAT CHANNELS.

That was a great video... and a great shirt as well.... Rock on mate!!!!

Great video!

THX! for the ideas on troubleshooting. outstanding.

Not too bad for a DIYer, just kidding,haha!! Nice diagnosis and follow up test to prove your theory. "Professionals" take note, this is how it's done.

Nice very good info 👍

Hi I’m new to the channel you’re extremely knowledgeable I like your style Of teaching and explaination Subcribed!

that vid made me subscribe, and I don't even have a misfiring engine. superb! thanks Matt

I like the dedication and commitment to your beginning community. Subd outta respect. Keep it 💯 👊

Good show, thanks for sharing!

Thanks bro am going to check it out

So you could have made the same diagnosis by elimination alone. What sort of a mechanic must the first guy must have been. Another excellent video. My best from Scotland.

Very nicely done Matt with a clear and concise explanation. And great follow through with the procedures to coincide your explanation. Very nice of you Matt to give me a shout-out as it’s very much appreciated! The very best wishes to you and your family. And of course, I hope your new website will be a great hit. There’s going to be a lot of folks with vast amounts of new knowledge!!! 😀😀👍

Great shoutout at the begining. Dave has some excellent videos, I wish he made more of them.

Matt, hello been long time first want to congrats you on 100K sub and thanks for loading such suburb video full of excellent info for diyer always waiting for the next one thank you and cheeeeeeers.

Excellent one.

Your starting sound like professional 😂

Hi Matt my friend has a Renault Espace 2.0 turbo 2005 when he brought the car to the mechanic the windscreen wipers wers not working( no power to electricity connection to the wipers motor), fuses were and are good. so the new software to the UHC ( one of three contents od the Comfort Module ) was installed. After that the wipers are working, but there is no connection with climatronic now( not even a display). Shoud there be another software installed now, or should we check in other direction? Thanks

Great video bud

Good evening sir just another Mastertech with my two cents good thing to tell the DY is you can pull a single injector wire off on each unit without the risk of hitting 10,000 KV from dis ignition, continue to pour each injector wire to listen for change and when you pull in injector wire with no change that is your cylinder misfire. All the basic diagnosis fuel compression injector pulse which is the grounding signal from the PCM flashing injector for on-time same thing happens for the coil I’ll call Elsa hot from the PCM they are used as a ground sink from the powertrain control module have fun guys.

Thank you Matt

Love your videos,love the shirt

I subbed bc I learned about using electronic gadgets to troubleshoot electromechanical systems. Nice!❤

Nice troubleshoot! Thanks

You are a really good Mechanic

Exselete diagnostic Tec. Nice video

If you find this useful please dont skip the ads so the guy gets a couple pennies atleast for the free info hes been giving to us so generously

Thank you Matt. Good job. Appreciate your videos. Bless you and your family.

Great video and analysis Matt, what backprobes do you recommend for these plugs?

Very good Matt

Great vid, looking forward to your teaching page.

Great video

I had the same thing. Bright light on the constant 12volt side of injector but a barely seen filament on test light for the pulse side. Thank you!

Great diagnosis

APPEASE US OHH MIGHTY APPEASER!!!! 😂 Great video

Hello I have same issue with my dodge grand caravan . But how often do you need to replace cinlinder head ? When no fluid shown thanks in advance

Great video thankyou

Thank you very much Matt you’re cool awesome video thank you

Thanks Matt.

good work man !

A 194 bulb with the leads pulled out makes a great noid light for injectors. Great Diag !

Very well done.

Great video, thx