I love the technology! I’m old enough to have done this type diagnosis with a vacuum gauge, compression gauge and leak down tester. Not having to hunt through every cylinder on the engine is a real time saver. Plus, you have the scope traces you can print and show to the customer, coupled with an explanation of what’s going on. It makes us look like we know what we’re doing! 😎

That was a great capture! Well done!💪

Nice capture! Awesome to be able to see the compression out and pulses in the intake.

Great to see you back buddy! Well done brother 👍

That last capture was amazing! I've started to use my Pico more and more these. What a powerful. A tech with the knowledge and skills to use it will be unstoppable. Like you! Great job, man!

I had an 05 dodge caravan that came into the shop with a broken valve spring, another shop told them that they needed an engine and they didn't rin any checks on the engine. The van sat for about six months when they brought it to me. I didn't have a scope at that time but I did run a compression check and leak down that's when I found the problem cylinder. This one had a dead cylinder all the time. I bought my pico about 6 months ago and it has been a time save and eliminates guess work! Thanks for showing the video! I will be getting a pressure transducer very soon!

That was a fantastic video all around! You had a great teacher huh? The entire approach and thought process here is brilliant brother. Love that last capture where you had and then lost it. All found with non-intrusive testing. Can't say how much I love this one man. Great job! Tell me, is this a common failure on these engines? I don't see enough of the Euros to know.

Tom's like a young Paul Danner, he must be so proud.

Great work! I really enjoy watching you go through the diagnostic process.

Great capture and find bro! I really understood that the entire way through the video and elimination process ‼️

You're diagnosis are perfect and am loving to watch your videos

Well done as always, Tom. Funny how it had compression until oil pressure in the lifter was enough to hold the valve open.

Excellent video,not seen many broken valve springs in my day.

This is a great example where a compression gauge could have messed you up. Even a cylinder leak down test May or may not have shown the problem.

Man that was a perfect capture for a demonstration. Doesn't get any better than that. Great job man!!! Great find.

Best diagnosis procedure I ever saw VW repair video.

This is one of the coolest captures ive seen in a while man. Thanks for showing us

The scantool lead the way to looking at four, the ear heard the compression issue while cranking, the pico shew where the problem was and the eye found a broken spring. You studied under Paul Danner, if I remember correctly. Good job, good job. I am sure your boss appreciates you doing what you do for him. That is, I hope he knows what you do with the tools... does he ever buy the crew lunch and eat it with them?

That transducer and a scope are a must in my opinion. Yes expensive but much more reliable diagnosis!!! Great call!

This is literally one of the best videos I've ever seen. Good job man

excellent. The 1st time I saw that problem was on a 1988 buick regal with a 2.8l. the problem was opposite though. missed until engine ran for a few minutes and then clear up until the next cold start. the coil on the spring would lock back in place after heating up. no relative compression or transducer back then....just a big old analog vacuum gage on a Sun engine analyzer caught that one! great work, its good your passing it on like your Sensei.

Very impressive diagnosis Tom. Wow, right down to the valve. Well done sir!

Stellar troubleshooting! Bravo! It’s pretty sad though that VW has these sorts of failures in 100+ year old technology (valve springs). Perhaps I’ve lived a sheltered life, but I’ve never heard of a valve spring breaking on a Toyota motor.

Excellent work. Thanks for sharing. I just had a similar problem in a Pontiac, it took me a lot of work to locate the fault and if I had used the oscilloscope and the tests shown in the video I would have found the root cause of the problem quickly and easily. This video is very valuable to me. Thanks again

PLEASE MAN KEEP YOUR GREAT DIAGNOSTIC VIDEOS COMING REALLY APPRECIATED THANKS AGAIN !

13.27 = The MONEY SHOT, Brillant diagnoses Tommy cheers sandy

Just done one on a 60s Chevy van with a 350 V8. Don't see many of them in the UK. Found that one by the conventional leakdown method though. Telltale cranking sound and cold exhaust header were my clues in this case. #8 intake valve spring was broken into 3 pieces. Same customer has an old Bentley S3 with what sounds like exactly the same issue, but I will be working on that in a few months' time. Nice to see different ways of approaching the diag, and especially the little quirk where you had compression for a few seconds until oil pressure built up fully in the lifter!

Awesome video. Shows why having a scope and a pressure transducer can save viable time.

Great investigation and thought process and may well be the very issue I am experiencing right now on the very same model and year.

Great diagnosis. The owner was lucky severe damage did not take place. You wouldn’t expect that on a 3 year old car but it seems nowadays all the manufacturers are cutting corners.

Brilliant diagnostic approach

An absolutely superb, Diagnosis. I really loved ,the testing process. Well done sir. Brilliant test gear. Keep up the superb work. Steve from the uk.

Tom, Great job very nice presentation for diagnosing this issue!!

really good diagnosis, scope saves the day again

Top notch video, and diag. I'm glad you're back to making videos.

Great find and great captures! Happy New Year!

Nice video thank you for taking the time to show us that case study. Keep up the good work

Damn that was such a perfect capture nice 👍

i like your strategy step by step ,that make me call you professional ,and put a big thumb up!

Just had this exact same issue on a 2015 tiguan, broken intake spring on #4 causing a misfire.

That was a GOOD one! U knocked it outta the park. When u first heard the consistent cranking, and then it went away, u were onto the scent. Quick and wise use of the tools! Reminds me of the Diagnose Dan doorhandle. Although in his vid, there was some blood on the knuckles in his vid. Man, we have some great channels on KZfaq!

Master Diagnostic 💪🏻💪🏻💪🏻

This is a sweet diagnosis and use of a pressure transducer! Who the hell would hit the dislike button on this one, some people WTH? ANYWAYS, GREAT job Tommy...thanks for this man!!!

Excellent diagnostic video. Thank you for sharing. And welcome back.

Great video showing the value of non-intrusive testing. Thx for sharing 👍

well done from zimbabwe

Great case study! Thanks for sharing! Welcome back! Killer way to start the new year lol. Looking forward to future videos.

Excellent diagnostic approach.. Thanks for sharing.

I have noticed that although different engines dont have the exact same waveform, they do share the same type of strategy, in this case, the exhaust cam leads the intake and the VVT type system operates about the same number of degrees. As for your friend, why didnt he inspect the gears for some type of markings like part numbers OR align the timing marks up and see that the windows are not the same OR he did do it too late to figure it out, could have called the parts department to figure out the different numbers, that is too sad but without the mistake, we would not have gotten 2 known good waveforms so it was all for a good reason, THANKS, friend.

I love seeing stuff like this. I need a pressure transducer.

Solid diag and easy to follow! Great work 👍

Brilliant disgnostic techniques !

very good video. I will try next time thank you

Nice video...Would've like to see a bore-scope used to look at valve/piston for any possible interference damage despite its unlikely existence given the compression comes and goes..

What an awesome diagnosis.

Absolute quality diagnostics mate. Well done. Very helpfull

Awesome video. Thanks for trying again so we can see the difference. Very awesome capture.

Nice diagnosis Tom & great video! Great to see you back...keep them coming!!

Very well explained video. Good call on spring diagnosis. Awesome.

Absolutely smack on ,great test , really liked that.

Nice diagnostic..good to see you back !

Great video...nicely explained...confirmed with little dismantling...pico 1...spanners 0

blessings. my friend there's no problem is the inyectors keep opening during the relative compresion test with the coils unplugged? I mean if they dont draw the cylinders. good job man

AWESOME TOMMY, HAPPY NEW YEAR HOPE TO SEE MORE AND TALK ABOUT UR VOLT AND TIME SCALES IN UR PICOSCOPE SO WE COULD LEARN MORE ABOUT THE SCOPE THANK YOU AND CHEEEEEERS.

What a great video! Quick efficient diagnostics !

Nicely done man, such fine captures you got there in the video. We only hope that you will have enough time in the future to do many more. Cheers!

Excellent capture and diagnosis Tom..

thats well cool first time ive seen blow by one with a scope

Thanks you.. I got the exact problem with my gti!!! New injector.new coil. New plug. Dead cylinder.i will shoot straight to valve spring!!!

HAPPY NEW YEAR....GOOD TO SEE U AGAIN..REALLY HOPE TO SEE MORE DIAGNOSIS FROM U........

Glad you’re back. Good Diag, nice waveform.

good to see your back..

Très bonne vidéo avec de belle capture a l'oscilloscope ! j'ai quand même 2 remarques : - Pour le test sous démarreur j'aurais coupé l'alimentation en carburant en débranchant les injecteurs ou le relais de pompe plutôt que de coupé d'allumage, pour éviter d'abimer le catalyseur. - Pour la mesure de pression pourquoi ne pas avoir utiliser la sortie du capteur de pression déjà présent sur l'admission ?

Hello! I make a short hose from the inlet to the sensor, less than the error of air oscillations. I use a piezo sensor, without amplification, there is no signal inertia.

Great job with the diagnosis!

Great trouble shooting on point..

great work !!!!!! I heard the even cranking also.

Awesome diag work Tommy where have you been hiding brother... Very nice findings man thank u for sharing

Nice to see you back Wolfie Video was bad ass. 👍👍👍

Very cool. I fricken love this sort of stuff. Thanks.

Really cool!

Welcome back! Thank`s for sharing!

Thank you Tommy. Good job. Have a blessed and safe New Year to you and your family.

Well done 👏

Tommy thank you for this great video. I know it take a lot of your time. Happy New Year.

Awesome Tom............. Lyk VW and Audi

Nice job Tom, Very good video and very cleat waveforms.

Great video. Thanks for taking the time.

great diagnosis

great find like your approach !

Love watching your videos, thank you!!!

You are the best

Yup great capture. Your awesome dude ! Great job as always. Thx for sharing.

If you have a burnt valve or bad valve it is easily detected....hold a KLEENEX in front of the exhaust pipe...in close right at the pipe...if the Kleenex SNAPS back INTO the pipe when vehicle is IDLING...you have a valve not sealing otherwise the kleenex will flow out smoothly. The back pressure will suck the kleenex in the pipe if the valve is bad.

What would it generally cost to have the valve spring replaced at a shop? I’m having the same misfires even after replacing all the coils and spark plugs.

Great diagnosis cheers 👍

Please could you tell me what pico scope you use

Cool diag : ) Hope to see a lot more vids from you this year.

It's been awhile Wolfe'Man..Happy New Years to you. It's good to see another diag from you. Great job on that too. Question: What psi transducer did you end up using on that? That was a nice clean waveform for sure. Cheers Bro

Nice diagnosis!