PERFORMING RELATIVE COMPRESSION WITHOUT AN AMP CLAMP

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PERFORMING RELATIVE COMPRESSION WITHOUT AN AMP CLAMP

Рет қаралды 13,327

Күн бұрын

The compression test is meant to be the first check. If the compression looks good, you can quickly move on to investigate other potential causes. If the test detects a low cylinder, you should perform a manual compression test to verify the data and determine the faulty cylinder.
With a relative compression test, you can easily determine if all the cylinders in an engine have equal compression. This test is a quick check on compression that you can do without removing the spark plugs or glow plugs. It uses the starter motor current to determine the comparative compression values on all cylinders. The advantages of doing this test are that you do not need a pressure transducer/sensor to run the test, all you need is a scope and a current clamp and that you do not have to check each individual cylinder, all cylinders can be tested in one go.
The theory behind the relative compression test is that the amount of current required to turn over the engine while a cylinder is on its compression stroke will indicate how much the cylinder is compressing or leaking. This will information makes sense when you compare all the cylinders, as you can easily see if one is weaker than the others.
It is important to remember to prepare the vehicle for testing so that the engine will not start during cranking.
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Пікірлер: 58

@alexs3598 2 жыл бұрын

Just traded in my legend for a Snap-on triton D-10 because of your videos just for the scope. I purchased the intelligent diagnostics subscription in the mean time to familiarize myself with the scope. Gives you known good waves and where to probe to test. I understand the concepts but Would love a video talking about all the configurations you go threw a such as mirror form, rising edges, slopes, m.s. and stuff like that. Thanks for all the videos. It’s helped me on my journey. Especially with no communication issues.

@MasterAutomotiveTraining 2 жыл бұрын

Congratulations on the new scope buddy! You'll love it! You got it!, Ill get working on a video to help you learn all about scope setup, once I complete it and upload it, ill add the link here once its ready, you can also subscribe so you get alerted when it drops.

@ksauto918 2 жыл бұрын

THIS VIDEO IS GOLDEN OSCAR THANKS

@MasterAutomotiveTraining 2 жыл бұрын

Thanks for watching and support!

@alf699 4 ай бұрын

Perfect :-) Simple to the point explanation with a simplified test to proof if the person understood what is shown in this video.....Well done.

@sollykhan2385 7 ай бұрын

Thank you for this great video, very helpful and educational, please post more, much respects 😇

@ifixfords2008 4 ай бұрын

Very cool! Thank you

@robertomijango6207 2 жыл бұрын

great video on cylinder #4 after you remuve the spark plug look bic diferent thank for you time

@MasterAutomotiveTraining 2 жыл бұрын

Thank you for watching buddy!

@atomsworkshop195 2 жыл бұрын

Nice video, with a good explanation and examples of good and bad. Keep up the good work buddy 🧐

@MasterAutomotiveTraining 2 жыл бұрын

Thank you for your support and we will continue to produce more content for the industry!

@arthurfricchione8119 2 жыл бұрын

Thanks for sharing. Excellent informative video.. now to set up and try. 👍

@MasterAutomotiveTraining 2 жыл бұрын

Give it a try, if you need added help we are just a comment away!

@steveanderson4553 2 жыл бұрын

Great Video ! I really enjoyed watching ! 🤜🤛

@MasterAutomotiveTraining 2 жыл бұрын

Thank you buddy, appreciate you watching!

@sebczajna700 11 ай бұрын

Hi, great video as well. I have one question. I have Sato1004 and i dont know how switch off automotive mode in this scope. Thats mean I have all time Cam and crank measure on from last auto test, and i dont know how switch off channel to normal scope work(basic). Best regards

@wannaPreG 5 ай бұрын

I have tried to use hantek d72 to learn this but I didn’t get the what you got. Infact most of the videos been made, you guys need to take it slow for most of us are beginners and we will like to understand things from newbie level not pro level . Thanks

@Leodan828917 2 жыл бұрын

Thanks for the videos they're so informative. I have a micsig and I guess we have a love hate relationship at the moment. My question is pertaining to the lead on the control wire. Is that same lead also connected to ground like the other channel connected across the battery. I'm not sure when I should be using a lead with just one probe or one that splits off into two probes. I hope that makes sense.

@MasterAutomotiveTraining 2 жыл бұрын

Thank you for watching! Each Channel lead will have a signal and ground lead. I double stack my grounds at the battery then each signal will be on different points. Just like a DVOM your scope measures the potential difference between the black lead and the blue, yellow, green, red lead. Does that make sense?

@trublue2319 11 ай бұрын

Yes

@mikedavidson2117 Жыл бұрын

Hi I would like to see setting up the mic sig scope for various sensors

@MasterAutomotiveTraining Жыл бұрын

I cover some in this video. kzfaq.infon25gMACDNB8?feature=share

@robertotto7673 2 жыл бұрын

You move fast, but a great job. Thanks 👍

@MasterAutomotiveTraining 2 жыл бұрын

Thank you sir, Ill slow it down on further videos.

@elgallo133 2 жыл бұрын

Muy buen video profe 👏🏻👏🏻👏🏻

@MasterAutomotiveTraining 2 жыл бұрын

Muchas gracias profe!

@gilbertnunez732 Жыл бұрын

great information. 👍

@CHIBA280CRV 2 жыл бұрын

Fantastic informative video sir, I subscribed 👍👍👍

@MasterAutomotiveTraining 2 жыл бұрын

Thank you buddy, more videos to come!

@JD730 2 жыл бұрын

Triggering off a coil is nice if you don't have a misfire counter. But if you have a misfire counter you can just hook to the battery using 1 channel and if there's a missing hump then you'll more than likely know you don't have compression in the cylinder that's misfiring. Same can be said if you have a misfire counter counting up for multiple cylinders.

@MasterAutomotiveTraining 2 жыл бұрын

Misfire counter will say what cylinder the PCM thinks is misfiring. This has bit me in the you know what before, because of this I make sure im synced so I don't misdiagnose.

@arthurfricchione8119 Жыл бұрын

Don’t you need to deactivate the fuel injectors? I have a Honda 3.5 and a Honda 3.0. Please let me know. I own your scope and don’t want to ruin it. Also on primary and secondary ignition do you need to use an attenuator? It doesn’t say anything on the scope when hooking up? Thanks for your help 👍

@nickayivor8432 Жыл бұрын

SUBSTANTIAL Master Automotive Training My teacher Thanks for sharing what you know with us SUBSTANTIAL Master Automotive Training From Nick Ayivor from London England UK 🇬🇧

@MasterAutomotiveTraining Жыл бұрын

My pleasure

@carlosmel2882 2 ай бұрын

Will I be able to use any scope to do this test ?

@AFatherToTheFatherless Жыл бұрын

I'll say the only flaw with this video was you didn't show where you hooked up your leads on the oscilloscope itself. I'm new to oscilloscopes and you said 2 channels but I saw 3 hookups: 1 to battery neg, 1 to battery pos, and 1 to ignition coil. As someone that's new to scopes, this is confusing when you don't show exactly how you have EVERYTHING hooked up. Helpful video though

@MasterAutomotiveTraining Жыл бұрын

Hey buddy, welcome to the scope gang. At 1:11 my yellow lead is channel 1 connected across the battery. Channel 2 is my blue lead, connected to coil #1. Any scope lead will have a colored lead and a black ground lead. This is because the scope reads to potential difference between the two leads. Hope this helps.

@oscarh.3359 Жыл бұрын

Súper tus videos , tengo una pregunta en qué cable del inyector conectas para la señal . Estoy aprendiendo a usar el miscig gracias

@felixautotech4754 10 ай бұрын

lo conecto en la bovina

@oscarh.3359 Жыл бұрын

Otra pregunta amigo en el miscig donde encuentro esa configuración intente en ignition y pressure test pero no me aparece con la batería mil gracias

@antonioquintana732 Жыл бұрын

Lo haces muy tecnico, complicado si es tan facil, nose porque te complicas tanto

@MasterAutomotiveTraining Жыл бұрын

Me puede hacer un video, más fácil sin estar tan complicado como dice, ya que esta es la forma correcta y más sencilla de hacer esta prueba sin pinza amperimetrica.

@Epochred Жыл бұрын

Would this provide enough definition if the cylinder only had a partial leak rather than a 100% leak?

@OscarSegundo Жыл бұрын

typically you would want all humps equal, for a partail leak one hump might be shorter than the rest.

@VoltageDropDiagnostics 2 жыл бұрын

Four! haha! Nice shirt by the way! Does that scope have the ability to AC couple?

@MasterAutomotiveTraining 2 жыл бұрын

Thank PJ, love the T-shirt! It does, it would have given me more defined waveform?

@VoltageDropDiagnostics 2 жыл бұрын

@@MasterAutomotiveTraining yeah, try turning on AC couple, and then drop the voltage scale down to 5v. It will make the waveform taller and a little easier to see when you stretch it out.

@MasterAutomotiveTraining 2 жыл бұрын

@@VoltageDropDiagnostics Thanks buddy, I'm going to rerun today, plus Ill do with other scopes with today's class.

@karuchvz9305 2 жыл бұрын

Did you use the attenuator to connect the coil wire?

@MasterAutomotiveTraining 2 жыл бұрын

Not on this one. Since this coil is intelligent the module is in the coil, I only needed to backprobe the PCM command to the base of the transistor, which is a square digital signal. If it was an older style 2 wire coil, yes I’d use an attenuator.

@karuchvz9305 2 жыл бұрын

@@MasterAutomotiveTraining thanks good information I think I learned something new today .

@MasterAutomotiveTraining 2 жыл бұрын

Glad you are learning buddy, keep it up!