Thanks for the feedback. If I was born 20 miles from where I live now, you might not be able to understand me 😂. UK Accents! Great to have you on the channel.
Hello, i want to thank you for your whole production ! If is possible to donate your work somewhere i will not wait on anything and i will send some support for your work, its just cool and amazing, thank you and thanks to all same smart and inspiration people like you. This world needs smart people which have what to say and teach other people! Bless you man!
This is a very humbling comment, thank you! Currently I don’t have a direct method for donation, however I have some plans for the near future where you will be able to access more of me and my learning content in exchange for a small fee. Watch this space! Thanks again 👍
With every clip I watch I'm becoming more and more interested in buying that picoscope. Dude, the possibilities! Say you get a car that has that annoying ever-so-slight twitch every once in a while, indicating a misfire but not enough for there to be a DTC. Air leak? Bad spark? High temp? Injectors? Coils? This type of diagnosis, and combined with your other vid on how to test ignition coils, makes it sooooooooo easy to in, say, 15mins?, completely exclude the ignition AND fuel system directly above the cylinders. Amazing, no more half-arsed guessing. Just comparing each coil and injector. The moment I get that picoscope I'll be amp-clamping every single part I can get my hands on haha
Rather refreshing to learn from a person with brains. To the point, no babble, and important info not missed... Basically, you show how to avoid to buy an expensive scanner, with subscription. You have the fortitude and grace to provide reel markers in the description so one can copy them and make an index and go straight to the pertinent section directly when needed. You are a cut above all the joes who crowd and cloud the Internet. Thank you ~
Thanks for the feedback, and glad you’re enjoying the channel! I also have a waveform library you can access and play with all the waveforms created in my videos. Great to have you on the channel 👍
One of the best explanations that I've ever seen what happens in an electrical circuit containing inductance during the transient process. Maybe you should show in future how to test the electrical parameters of the injectors without oscilloscope and current clamp!
I think my next purchase needs to be a low and high amp clamps 🗜 your a bad influence! 😂😂 seriously though this is all good stuff! And I will look forward to collecting more known good waveforms off my own scope and cars. Cheers.
I have watched (and DLd) of ton of your VERY informative tutorial type videos. Not sure if you're done a video detailing what is (and is not) important when thinking about getting an oscilloscope for a car mechanic. That would be great. Perhaps one video about the oscillator and one about the software from automotive perspective. Do cover the amp clamp too.
Nice video, very educational sir. I believe the phenomena is called counter EMF that’s produced in a coil. Back EMF is produced when an AC motor is spinning creating voltage of its own. Just an FYI
Cheers, glad you enjoyed the video. I think there are many references for the same phenomena; this article looks at the relationship between self inductance, Lenz’s law and inductive reactance - all of which are related to the EMF you mention 👍 www.nde-ed.org/EducationResources/CommunityCollege/EddyCurrents/Physics/selfinductance.htm
Hello from the US . I'm a lady master tech and I Love your videos! Another way I have been taught to test for misfires, is to test the power side fuse at the fuse box .If the coils or injectors are not accessible you can take out the fuse for either one and install a loop of wire with a fuse in its place , the current ramp all the injectors or coils to see if one is failing causing the misfire and put a trigger on it , like you would do with a RC test. You can also do a fuel pump the same way. A good video to make could be on testing with the mini amp probe at the fuse box on different things?
Hey Darren, Great follow on from the last voltage/injector video. There is so much that can be learned from both the voltage and current waveforms run in combination. This includes the MOSFET & diode or zener diodes inside the ECU used to 'clip' the flyback voltage, which helps control the injector close rate. Well done on another brilliant video in the oscilloscope series! MiracleMAX 😁
Hello my friend. I didn't know before that I could need such a clamp in way to repair my cars (haven´t had till today injectors problems) . Now that I'm watching your video, I might buy this thing. Or not ? Anyway , decided to subscribe to your channel . Cheers
Cheers Denis, I was quite pleased with myself on that one 😁. Maxing out higher than expected was just because I put a resistor in parallel to the injector increasing the total current. I don’t think it would do that on a real short circuit, just the initial vertical current increase 👍
From the video, you stated that the pintle hump on the current waveform means the injector pintle is open and the pintle hump in the voltage waveform means the injector pintle is closed. Do we need to use 2 channels when checking injectors?
To see these 2 events, they need to be checked with an amp clamp and a voltage probe. Separately. You could use one channel and do 2 measurements. But yes, this is 2 separate tests
Really like your videos. I want to lern more. Did you recomend the Pico 2204A to start with? Or is it easier for a beginner with a more expensive scope? More help functions etc?
Hi, glad you’re enjoying the channel. To be honest, to a beginner the 2204a and the most expensive 4425a would appear very similar. I think the 2204a is a great starter and you can always sell it if you decide to upgrade. All the accessories can be used on any other Pico too 👍
What's your opinion, using the 6 way universal breakout lead's ? Is it good, by the mean, no back probing and make a damage to the loom? Do we have better connection (and waveform) ?
They are quite useful. Couple things to be careful of from my own experience. 1. If you are looking for a fault, removing the connector might affect the issue 2. Always check they are ok before you test, I have used faulty test leads in the past.
Found you on mechanic lab scope Facebook had to sub good content keep it up you should look up bodget and legit on this his here in Ireland and does a lot with scopes
Cheers! Yes a solenoid diesel injector is similar but might look quite different voltage wise. It also depends what type of diesel injector you are measuring; there are 3 main types used in the last 10 years that would all look very different to each other. Lots of questions on diesel so I will make a video soon 👍
@@MechanicMindset yeah! I have a 6.6L DURAMAX LGH V8 Turbo (diesel) Direct Injection in a Chevrolet Express 4500 mini bus, (14,200lbs vehicle)... it has the super duper $400(ea.) injectors. Will look for the video.
excellent. question: how would one interpret the slight short / initial vertica current spike that you explained toward the end? Is it indication of a failing/dying injector?
Inductance in a coil is the property that resists a sudden change in current flow, effectively limiting initial current flow while the magnetic field is building. That's what causes the normal current ramp to be wedge shaped. Normally when a coil is shorted, the insulation at one spot has melted to the point that current can go through fewer loops of wire before it finds a direct pathway to ground. With fewer loops of wire, the inductance of the coil is reduced, so the current ramp is steeper, more closely resembling the way a normal resistive circuit behaves.
Hello. However, I bought a pico 2204a, i.e. with 1 \ 1 x 10 probes for trucks, the possibility of connecting 24v and a current clamp adapter may be useful. Hantek starter will probably be too weak? thanks for the help.
@@MechanicMindset to the probe to measure 24v is probably a choke needed. and the tongs will be an expensive thing. inrush current about 2300 amps. unless the starting current is not measured, Hantek 650 may be enough?
Just a question, if you connect the ground to a chassis ground on one channel while measuring a lamp, and the ground elevates at 0,1V because of voltage drop, is the second Channel, where a battery powered ampclamp is connected going to show something wrong?
Current will flow across the ground through the scope; you must not do this with a common ground scope. We did a video on this 👍 You need floating grounds for that.
Hi, I would start with the diagnostics. if you have an older oxygen sensor you can measure the signal voltage. The newer broadband oxygen sensors are more difficult to measure with a scope, you need a very sensitive amp clamp.
What about the coils oscillations at the beginning of the amperage waveform, I see some vehicles have them and others don't. Is that something you look at?
@@MechanicMindset I was always taught that they're very significant as for addressing the coil/injector etc health. The start of building the magnetic field, technically the injector doesn't actually open until about half way up the ramp and after the injectors turned off there's still a small amount of fuel being delivered until the pintal is fully closed. Of course this happens in micro seconds. Just a thought, but I really do respect your videos. We're you using just a x20 attenuator for the voltage signal? I worry alot about damaging my scope (2204a) as well.
@@alanw5879 Haha, no; I already have the injector voltage signal connected on channel B when I presented the scope. A few people have asked that, I must be careful with that in future videos, could be misleading! 👍
Hi, Why do you use an atheunator when testing the voltage and current of the injector when the maximum input voltage of the oscilloscope is 20 volts? Best regards
Hi, I only use the attenuator for the voltage signal (not the amp clamp). The spike goes up to about 120V. Sorry, I had the attenuator connected when I picked up the scope and didn’t make it clear it was for the voltage signal. I cover this on my last video, check it put if you haven’t already 👍
When the magnetic field collapses after the injector is turned off it induces a huge voltage spike that will fry a small scope like the 2204a. But it's a great scope, I use the same one all the time.
Sure, amp clamp is connected to the oscilloscope via the BNC connector and I have clamped around the injector wire at the injector. Doesn’t matter which one 👍
@@pyrorenegade4983 No worries. In theory, you can connect an amp clamp anywhere on the circuit (I.e. live side, ground side, you could also put a loop at the fuse or relay and measure there)
It baffles me when you look inside the clamp there's not much there. Why make it so bulky. Not to mention the jaws can't clamp on some battery cables. Lmao
The tiny jaws are very limiting! I’ve never opened it up. I’m guessing at one point the space was needed and they never re designed the body. There are a few brands using the same body design
