PicoScope Basics: Relative Compression Testing

Relative compression testing is a great way to check for the mechanical viability of an engine in many diagnostic scenarios. In this video, we explore the basics of setting up and conducting the test using PicoScope equipment, and toward the end compare a handheld OTC Oscilloscope's function. To simulate a fault, I also remove a spark plug and set a reference trigger using an ignition event for cylinder number one. This video should useful for getting started with relative compression testing for any new, beginning or curious technician.
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Components in the video:
- PicoScope 4223 2-CH Automotive Diagnostic Oscilloscope (PP502)
- PicoScope 600A Inductive Clamp
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Пікірлер: 33

  • @billyyoder8171
    @billyyoder81714 жыл бұрын

    Thank you Adam. Good job. Have a blessed and safe week to you and your family.

  • @AdamsAnalysis

    @AdamsAnalysis

    3 жыл бұрын

    Thanks, you too!

  • @jeremyf3798
    @jeremyf3798 Жыл бұрын

    Really appreciate the run down. For anyone else trying to watch this and study for the ASE A1 - the answer they're looking for is put the clamp on the positive wire going to the starter. I'm not saying the negative is wrong - that's just what the ASE is looking for.

  • @AdamsAnalysis

    @AdamsAnalysis

    Жыл бұрын

    Thanks for watching and adding to the discussion.

  • @abisismael1343
    @abisismael13433 жыл бұрын

    Very clear and helpful. Thanks a lot

  • @AdamsAnalysis

    @AdamsAnalysis

    2 жыл бұрын

    Glad it was helpful!

  • @CHIBA280CRV
    @CHIBA280CRV3 жыл бұрын

    Fantastic informative video thanks 👍

  • @ke6bnl
    @ke6bnl3 жыл бұрын

    good clear demonstration, thanks

  • @AdamsAnalysis

    @AdamsAnalysis

    3 жыл бұрын

    Thank you for watching!

  • @samuelgranados776
    @samuelgranados7762 жыл бұрын

    Just what I wanted to see .. you are a winner

  • @AdamsAnalysis

    @AdamsAnalysis

    2 жыл бұрын

    Thanks for watching!

  • @nickayivor8432
    @nickayivor84322 жыл бұрын

    KNOWLEDGEABLE Adam 's Analysis Tutorial very helpful 👌👏 👍thank you Adam 's Analysis From Nick Ayivor from London England UK 🇬🇧

  • @giopirmisashvili5514
    @giopirmisashvili55144 ай бұрын

    Thank you ❤

  • @LSmiata
    @LSmiata Жыл бұрын

    Great video on relative compression test. It can indicate many failure modes that will not show on a scanner b/c of mechanical failure. In my opinion, best to use a fuel injector to identify a cylinder and then follow firing order. Too many older engines have wasted spark ignition on mirrored cylinders, so its a 50/50 guess on which cylinder to check for more diagnostics. Again, great video

  • @jma8352
    @jma83524 ай бұрын

    i have the hantek cc-65 amp clamp, will that work if i set it right?

  • @sertinhosoares2088
    @sertinhosoares20884 ай бұрын

  • @Mohy.ly87
    @Mohy.ly872 жыл бұрын

    Much appreciate your time, but unplugging the fuel pump fuse is more easier? Or depends?. Thank you so much

  • @AdamsAnalysis

    @AdamsAnalysis

    2 жыл бұрын

    It really depends. On some vehicles it is a quick process to remove the fuel pump fuse. Many vehicles might tie in other systems to that same circuit. As a process, I review the electrical diagram and look for the quickest and easiest process.

  • @Mohy.ly87

    @Mohy.ly87

    2 жыл бұрын

    @@AdamsAnalysis bless you 🙏

  • @kirkbrown2147

    @kirkbrown2147

    2 ай бұрын

    Or remove the starter relay and crank it there

  • @frankwrenchman4573
    @frankwrenchman457310 ай бұрын

    Way to go adam

  • @AdamsAnalysis

    @AdamsAnalysis

    8 ай бұрын

    Thanks!

  • @gigostackkfmawi9263
    @gigostackkfmawi92632 жыл бұрын

    How does an electronic amperage test tell you anything about cylinder mechanical compression tho? I thought your wave form there only demonstrated spark (and combustion?) Or is the combustion itself signaling compression?

  • @AdamsAnalysis

    @AdamsAnalysis

    2 жыл бұрын

    When compressions is present, the starter motor must work harder to continue rotating the engine. With an amp clamp, we can see these rises in current usage and equate them to compression events.

  • @gigostackkfmawi9263

    @gigostackkfmawi9263

    2 жыл бұрын

    @@AdamsAnalysis thx this is really helpful and useful info.

  • @gigostackkfmawi9263
    @gigostackkfmawi92632 жыл бұрын

    So this test gives no actual compression read in terms of psi/kpa? But a wave form of "compression/ignition" (in amps?) That is used to give a relative idea of the entire compression state?

  • @AdamsAnalysis

    @AdamsAnalysis

    2 жыл бұрын

    That is right, the test provides no actual compression data. The reading shows us how each cylinder is performing relative to another. It is a quick test help us understand if a misfire is compression related.

  • @deeznutz3494

    @deeznutz3494

    Жыл бұрын

    If I can hear/feel a limp while cranking, what is this test telling me that I don’t already know? At that point, I’m doing a compression test on all cylinders followed by a leakage test to get a full health report on that engine, to assure nothing is missed. I’m sure glad all these scopes weren’t around, and they weren’t shoving this garbage down our throats way back when I went to school

  • @user-ho8cd2sw5c
    @user-ho8cd2sw5c5 ай бұрын

    nice i have an ampclamp but not like this one ,KAIWEETS KC 601

  • @fp8007
    @fp80072 жыл бұрын

    Very expensive test ! picoscope + laptop .. the itester carscope is better and faster 🙂

  • @deeznutz3494
    @deeznutz3494 Жыл бұрын

    If I can hear/feel a limp while cranking, what is this test telling me that I don’t already know? At that point, I’m doing a compression test on all cylinders followed by a leakage test to get a full health report on that engine, to assure nothing is missed. I’m sure glad all these scopes weren’t around, and they weren’t shoving this garbage down our throats way back when I went to school

  • @AdamsAnalysis

    @AdamsAnalysis

    Жыл бұрын

    To answer your question, adding a cylinder sync will help identify the specific cylinder with a fault. This would eliminate the need to do a compression test on all cylinders, saving time. A scope is just another tool. Sometimes it’s a good choice, sometimes not. The freedom of process during diagnostics is something I enjoy about working on cars. I’m always trying to learn new things and become more accurate and efficient. I encourage my students to do the same. Thanks for watching.

  • @morganwhite7750

    @morganwhite7750

    8 ай бұрын

    One of the benefits to a relative compression test is that you will have a better overall picture of what's going on in the engine, versus a conventional compression gauge with a Schrader valve will show you only peak compression number. Also on a 6 or 8 cylinder engine the rc compression test could save you a couple hours time with a non intrusive test, instead of removing all the coils and checking compression 1 by 1 .

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