Using an oscilloscope to test head gasket/cracked head
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- Опубліковано 2 жов 2024
- Thank you all for tuning in to Super Mario Diagnostics!
Cody's Auto Diagnostics Channel:
/ @codysautodiagnosticsp...
This video is meant to show how to test a head gasket failure using a scope and pressure pulse sensors to lead you to a definitive diagnosis. Of course, this is meant to take you to the next step in your diagnosis(leak down) but can help to confidently seek approval from the client to take that next step. This test also really shines when you have a very subtle head gasket leak!
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Boom first!!! Great video and approach brotha. Not having to Disassemble an engine to verify head gasket issue is top notch. Comes with skill and knowledge do do this with the scope. .Great video bro.
CODY I APPRECIATE YOUR HONESTY SO I AM SUBSCRIBING TO YOUR CHANNEL , ANY LOCK I CAN GET MY HANDS ON ONE OF THOSE PIEZO SENSORS THEY LOOK LIKE THEY WORK VERY WELL . ALL THE BEST AND PLEASE KEEP UP THE GOOD WORK !
8power0 thanks for the subscription. I’m in the works of making some more. Still waiting on parts to show up, but I’ll definitely let you know once I get them done.
@@codysautodiagnosticsprogra8706 CODY THANKS SO MUCH LOOKING FORWARD TO IT !
cody where can i get one of these pulse sensors?
Mario great video as always
Rick Williams II hey buddy thanks for taking interest in my sensors. You can email me at Cody’sAutoDiagnostics@gmail.com or find me on Facebook at Cody’s auto Diagnostics and shoot me a message. Please be sure to put pulse sensor in the heading.
Young kids these days... always finding better ways to do stuff! Nice! =)
😂
That's what I'm thinking! I'm having an issue with my 1998 Chevy 5.7 leaking coolant into the engine. I hope to God it's not a head gasket.
wyattoneable i sure hope not
I like the fact that you use a lab scope for a lot of your testing it especially helps people like myself that are just now getting in a diagnostics and we’re starting to use the scope more often. I got a lot of added benefit from watching diagnosticians like yourself do things like this for those of us that are new school diagnosticians just starting out
When you have the test equipment and hand such as a scope and a pressure sensor, it makes sense to use them to confirm a diagnosis without any disassembly. Keep up the good work Mario! :))
Great video brother! The power of a scope in the right hands!
Awesome video man! Thank you for sharing! Definitely enjoyed watching it.
Massive time saver. Great work. Using your brain and advanced tools to get it done fast 👍
I have one of Cody’s pulse sensors as well. Very well made.
I'm in the process of doing head gaskets myself. In my case, I didn't have to do any testing.
Windstar 3.8ltr never overheated, but was pouring coolant out of the exhaust. It could've been intake or gasket I suppose, but I did that 3 yrs ago. I didn't have that top on my list. Windstars are known for blowing out the gasket, as it rusts or rots out usually near the cylinder. Only about 3 tspns of coolant in the oil, when I drained it to check. So I was sure to go straight to head gaskets here. #4 cylinder on the gasket failed.
I like to see other methods of checking for head gasket issues, especially when they're only suspected... they really 'can be' hard to pinpoint sometimes. Buenísimo video Mario!
Absolutely fantastic never thought of that before but as soon as I saw pressure sensor wave it was boom. Don't worry about being heavy on scope use it should show the need and encourage more people to use them. Keep up the good work
Thanks buddy, great to have you sir!
Sweet! Would you consider this a "severe" headgasket leak? Ive had good luck using pulse sensors on severe failures, but haven't had the chance to use this method on a more minor failure.
No this is absolutely subtle! Great question. No chocolatey oil, just a very light miss during startup after sitting for a while
@@SuperMarioDiagnostics I'm glad to hear that. I havent seen many people use this method on less sever failures, so I'm glad to see it works just as well.
hey Mario....had a Honda pilot 3.5 come in with a misfire on #4 #5 did a quick coil plug swap to 6 no change....so I remembered this vid....with my first look sensor at the radiator and the junction at the back of engine disconnected to disable injectors, cranking test showed 2 large humps followed by 4 small ones being repeated.....couldn't deny that pressure was introduced into the radiator.....thanks bro
Exelente... I started use oscilloscope..I have ado104 jinhan, and Hantek 2d82.
@Cody Auto diagnostics needs to hook me up . with one of those . Nice job Mario , great capture ,
I'm going to DIY my own pressure transducer like this. My plan is to get a radiator cap pressure tester, run a hose from there to a sealed metal jug (to collect any overflow and keep it from going to the sensor) and to the transducer from there. Can't afford all that high dollar stuff. Still using a hantek scope with a homemade transducer "box" (replaceable transducer with 18650 battery bank providing 5v reference and ground for the transducer). It costed about 30 to 40 bucks to make the transducer box. Compare that with Pico's specialty transducers they cost hundreds.
hey mario. i never thought of using the pressure pulse sensor on the radiator. thanks for sharing.cheers dave
Block test re liquid colour change is checking for CO2 not Hydocarbons❤
سلام وتشکر ..👍...استاد محترم لطف کنین بزبان فارسی زیر نویس بفرمایید...ممنون
nice insite ! just waiting for my delivery from cody's sensors here in the uk .. cant wait to try them out :)
You're talkin about the cylinder leakage fluid for the tester, but that fluid only checks for C0 not for NOx. We use the gas analyzers to check for head gaskets failure. And I tell you it takes only 5 to 10 seconds to pull the NOx through the cooling system.
In cases of say a warranty job, where they only want the faulty head to be replaced, this would come in handy.
Also this radiator was busted midway so i doubt it would read much co2 or nox at the radiator filler. Much less was it able to be topped off.
This vehicle was a crank no start in my bay so i doubt you would get much nox at all from it.
No no that test was cool man I was just talking about another test you can perform. But the test you did is really good information to determine if it is a V block to know witch head is leaking. Just adding more tests for you.😊
Honestly i wish i had a gas analyzer, they're pricey! 😆 thanks bud!!
@@SuperMarioDiagnostics Yes they'er pricey but the other diagnostics test you can perform are pretty cool, and there are few of them. Like 02 if it is a short band sensor then it only reads 02 then there is another test for it. Checking for a catalytic converter by the readings you can tell what part of the converter is shot.
Simple and brilliant idea, that's ace I'll be using this next time I suspect a head gasket. Wow crank pressure too ooo this is interesting.
I really have challenges with setup just like u said at 5:03 hopefully u will probably enlighten me more on that thanks màrio
What sensor are you hooked up to on the green line? I see how you are using the cyl 2 as a trigger to tell what cylinder is what, but what are you tapping into to get the signal of low compression??? Thank you very good video
Hi Mario. How are you? Let me ask you a question: Why do you use a large hose on the pulse sensor (DPS)?
Good info.
If you could show how you set up pressure pulse sensors to the scope and calibrate them to read psi range or vacuum range.. Basically set up scales..that would be sweet
The beauty of this sensor is that it's a simple 20 volt scale. But yeah I'll start putting in more set up. Thanks buddy!
@@SuperMarioDiagnostics Also you could have shown how you set up your sensor to prevent coolant from entering, did you just raise it a bit higher than the reservoir.
The coolant level was low due to a busted radiator. No need for the coolant to be topped off, the sensor is sensitive enough to pick up any pulses within the cooling system. But I'll definitely keep that in mind when posting the set up video
Thank you Mario. Good job. I appreciate your videos. Have a blessed and safe week.
You had good luck from that booster pack jump box? I have that same one and it’s tough as nails! It’s the only one we’ve had at the shop that lasted as long as it has.
John Pilgrim yep it's done us pretty well
Awesome video but incase u cant afford a labscope, and want a cheper way to check if u have a headgasket issue they sale a tester kit you put it above ur rap cap with a certain green liquid if it turns yellow then you have a head issue. I believe most auto store rent this out its really cheap.
Yep, that's how it's done right there folks.... Thanks!
Working smarter not harder. Nice diag, it's so amazing what these transducers and a scope can tell you.
Loved this video. Like you stated at the end would like to see more scope set ups. You explain them pretty good when you do. Thanks again
You have awesome 👌 knowledge in using picoscope
Keep the channel scope based...I can’t get enough. 👌🏾👍🏽🙏🏻
Thanks! I'll keep them coming!
great video scoping is definitely a fulfilling experience
Great video! Even if I can diagnose something without a scope, I always go back and put my scope on it. That's the only way you're going to get better and can eventually do most of your diags with scopes. I still have a long way to go but I remember the first time using a scope I was like, "damn I think this scope is broken, this don't look like scanner danner's waveforms" 😂
😂😂😂Thanks buddy
Love that scope work. Easy money. Lol
Let's see timing chain stretch using the scope.
Great video. This is my first time seeing this content.
tell me where you bought the pressure sensor
Thanks Man great video 👍👍
Ughh you always go for the high tech tools first!😠😐😒
Hey man someone had to say it... and let me add I am jealous now. Gonna need to get me one of those bad boys. I still use blue to yellow method 😞
I'll be sure to let him know to HOOK YOU UP! Thanks for stopping by Sir
Great test I can see the value in doing this especially for a quick warranty diag. but just quick question. As a flat rate tech. How do you keep from your diagnostics time being cut? Where the guy next to you doing the same diagnosis of 2-3 hrs to do a compression test/ leak down where I can see the shop or customer only wanting to pay half of the time for a scope test like this. Which is higher level and cost you more in equipment cost.
Sell the time first
thank you for showing the video
Will Thermal imaging work?
Awesome approach Mario. Thanks for sharing bro.👍👍
Hello mario ,Can I ask you something where did you set the pressure transducer , thanks
From codysautodiag.com
Nice video Mario , the only thing I’m not sure is if you 5:21 can get burn with that test in case what you see in the graph is the water pump pulses .
Water pump activity is much more rapid. You'll see several pulses between each cylinder compression
I like how you demonstrate how a scope could shine in various situations. From what I can see in the field using and understanding what is going on with a scope is pretty advanced. I always learn something new watching your channel. Good stuff Mario, keep them coming!
Much appreciated brother!
Yes indeed advance.. I'm interested in getting advance too with scope
In agreement with you
"Mechanical" = moving/pivoting/rotating/interacting parts IMO... I wouldn't consider sandwiching a head gasket to be "mechanical"
Great video! I love the scope stuff, keep doing what you’re doing. Thanks for sharing.
A great video. The first thing I reach for is the scope. A multimeter is inadequate for today’s automobiles. You will NEVER guess with a scope. Thank you for sharing. 1.9K. Great.
You make me proud SMD
Mario, man, i very much enjoy watching your video's with many others, the scope usage is very interesting, actually i bought a 4425 here not far off from when you made this video, took awhile to break it out and use it but now... i dont want to stop using it, getting used to how to setup, what to look for etc, im absolutely freaking loving it.. and hell i just ordered one of Cody's dps sensors... feel like im jumping in maybe kinda deep in a way but why not.. but through watching you and cody and others on youtube and through experience, i know its made a difference.. always the little things that make the difference!! and i know this is an older video lol ..
That was sweet Bud, very impressive how accurate you can get without disassembling anything ... 👍
Son of a gun. If that isn't the coolest thing ever. Now I'm up to speed, thanks Mario.
Awesome video. Where do I get a pressure pulse sensor for my snap on scope?
Reach out to Cody, @codys auto diagnostics on UA-cam
When using the WPX range 3 it defaults to DC and says channel overage but not on AC...should it be on AC or DC? ...I assume DC?
Range 1-3 is DC. Overange might happen if there's ignition interference or actual pressure surpassing the range. Zoom is AC. But in no setting do you need to select AC, it does it for you by pressing the buttons on the transducer
Super Mario Diagnostics thanks man, I did a capture today and got it work better
Great video man!
Like it Mario, I am not complaining about scope videos, I have the Pico 4425 & the WPS500 transducer. Love mine, and like seeing these videos. If you ever get a chance to use the Math channels on a diagnostic I am interested on what diagnostics need the additional setup. There are a few videos out there touching base on this setup, but your way of putting it out there with your videos I am sure to nail it, thanks for the share & keep it coming.
Thanks Mario for making this educational material available for us . Very nice job man .
First time seen Radiator pulsing video. Great Video Man 👍👍
Sweet video bro.. Real quick and easy method to find a blown head gasket.. Feel free to scope away man lol.. Awesome work brother thank you for sharing
Well done.
Great video...now I need to get a pressure pulse sensor....just got used too in cylinder testing now this...lol hahaha...thanks for sharing
Mario awesome video, I always learn something new. I am not familiar with scope use so I eat up your content
Getting my first Pico scope this week. And have 2 cases that this specific test will help me a lot. Can't wait to get this going and do this test.
MARIO YOU ARE TRULY ON THE RIGHT TRACK TO BECOMING AN ADVANCED DIAGNOSTICIAN.., THANKS SO MUCH FOR YOUR TIME AND THE VIDEO . PLEASE KEEP THE VIDEOS COMING WE HERE TRULY APPRECIATE THEM . REALLY WISHED WE COULD HAVE SEEN THE FULL PROCEDURE MY BY NEXT TIME AND AGAIN THANKS SO MUCH !
Non-invasive, time efficient testing always for the win. Nice job sir. I have 2 of Mike's sensors. I'm waiting for an opportunity to use both at the same time to prove a fault
Very good demo 👍
quick sample and effective diagnoses.thank you for sharing.
Hi Mario, if the pulse sensor was placed in the crankcase breather would we still get the same results, Thanks
Only if crankcase gases were leaking through the rings
@@SuperMarioDiagnostics thanks for the reply
Simply great diagnostics.Thanks for sharing
Great video. I must try that test. Also give you something to show the customer.
Great video. I like the approach you take to these problems. 👍
Thank you for sharing this great test. Can you show all set up?
Will do sir!
Mario how did you just plug into the filler neck where the overflow tube runs into? This is a great use of the pulse sensor
I show the exact set up, in real time in the following video 😉
Where can we buy that pressure transducer?
Visit Cody's auto diagnostics channel and leave him a comment, I'll also let him know you're interested
Excellent work Mario, thx for sharing.
Mario thanks for all the scope checks. I will definitely checkout Cody's sensor. Your the best and enjoy learning from you. Yes I definitely follow your circle of subscribers. Yours SMA Keith Ivan Cody Big Dog50001 Mike the Disgruntled mechanic and S&A automotive. If I'm missing any let me know. Thanks for your help Mario. Artie 👍👍👍
Much appreciated! Check out diagnosedan, oz mechanics, positive lead diagnostics, science of diagnostics, simply diagnostics, the practical mechanic, trained by techs, last but not least voltage drop diagnostics
how do you know for sure the head or block are not cracked? sweet vid mario! (Y)
This test is meant to justify further disassembly before actually dissembling anything. I'm sure there are some who have used these techniques enough to pinpoint whether it's a lower end crack, or a head gasket/cracked head issue. I'm not one of them 😆. But ultimately one can likely rule out a lower end crack if they do a leakdown on tdc and it fails. If they do a leak down on tdc and it passes, then they do a leakdown on bdc and it fails and bubbles out of the radiator or coolant bottle, then one can deduce that it's a lower end leakage. In either case once the lower end is ruled out, the head is going to be visually inspected and either serviced or replaced and the head gasket is going to be replaced anyway.
The pulse sensor can also be used during leakdowns, as it is extremely sensitive to detect even the smallest amount of leakage. Hope this helps
@@SuperMarioDiagnostics wow thx for the in depth reply!
great scope capture money shot thank you
Great video Mario,I luv the scope content keep it comin brotha
Happy New Year from Hawaii! Great video! Obviously the increase pressure from leak in the head gasket is self explanatory, but what causes the other pulses in the cooling system? Im thinking, water pump is affected by the cranking/compression of the cylinders? Thanks!
Right, water pump activity
Thanks, happy New Year
I wonder how sensitive this test is... I was working on a Toyota MR2 that would overheat after a 30 minute drive and took a bit of coolant each time I checked it when cold.
With the design of the cooling system with the coolant hoses running under the car, it was impossible to tell if there were air bubbles coming out of the filler neck. Bleeding air out of the radiator and heater core was a pain in the ass.
Cooling fans working as expected.
Absolutely no signs of coolant leakage in/out/under/next to the car anywhere.
Compression test showed a variance of less than 10lbs.
Combustion leak tester showed clean multiple times.
It went to multiple mechanics with no success. (should have kept shopping and found someone like you).
The owner traded it in on another car.
I always suspected that it had a very small combustion leak.
Do you think this test would have caught it?
Absolutely. This test is extremely sensitive. The piezo sensor is about as sensitive as it gets
Not to sound like a complete idiot...but just to be sure. This setup has the pressure transducer within the spark plug hole, then check ignition via the signal wire and sync to a cylinder, and use amp clamp on positive lead, and then using pressure pulse sensor on the radiator to sense pulses from headgasket leak? do I have that correct? I love how the videos btw! Thank you for posting!
-Nick
Everything is correct except i did not remove a spark plug to connect anything into the combustion chamber
@@SuperMarioDiagnostics How were you able to see the pressure's within each cylinder? maybe i'm misunderstanding how this is done? Thank you Mario for your time!
Using the relative compression test, which i explain here: ua-cam.com/video/eUAi7HZaIu4/v-deo.html
@@SuperMarioDiagnostics Thank you sir! I will take a look at this! Cheers!
absolutely brilliant sir,well done,i loved the use of the exhaust pulse pressure sensor for the water pressure test,thankyou loads.
Nice! Love the Pico, great tool. Thx for sharing 👍
Very cool,thank u sir👍
Awsome video!! Love watching your videos and trying to learn as much as i can
Well done Mario! I learned something new from your video. Just subscribed to your channel. I've been diagnosing and teaching automotive for thirty years and I am still learning.
I just want to know who is the ONE person who gave your video a thumbs-down?
Id like to know too 😆 hey thanks for the support sir!
Great vid.
Where can I get a pressure pulse sensor for my modis edge?
Reach out to codysautodiagnostics@gmail.com
He'll get you squared up
@@SuperMarioDiagnostics perfect thank you man 🙏
superb video. thanks
Can you show a video or how you rig up your pulse sensor the the radiator
You got it buddy ✊
Love all the scope videos, so yes keep the scope videos coming
I literally said wow out loud, what about gasket blown between cylinders? How can we identify that ?
That would usually show two low current peaks and when identified you'll see they are next to each other. it may or may not show up in the coolant pulse, or in a crankcase pulse
Great stuff, Mario. Scopes are awesome.
What if you had a leak in the egr cooler ? Cheers
That would not result in a low contributing cylinder plus a pressure pulse in the cooling system waveform
@@SuperMarioDiagnostics thanks mario