How To Perform a Compression Test

How To Perform a Compression Test - [EASY]

Рет қаралды 66,383

Күн бұрын

Does your car have a check engine light with a P03XX code?
What does engine compression test tell you?
Follow along as I teach you how to do engine compression testing, whether you are an automotive technician or a DIY-er looking for tips us pros use.
Grab your tools, lets get ready, lets hit it!
✅ Download your compression worksheet here ➡️ drive.google.com/file/d/1ffDl...
#enginecompressiontesting #compressiontest
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Пікірлер: 114

@raymondtrevino3003 Жыл бұрын

Thank you, this was very helpful. I appreciate the words you gave to articulate your point.

@gilbertnunez732 Жыл бұрын

Great refresher, Thanks!

@robertobetancourt1860 Жыл бұрын

It's a great tutorial video, informative and self-explanatory., you make it so easy to understand. Very happy

@denzdu1970 Жыл бұрын

Bro, this was an awesome video!! Thanks for sharing your knowledge👏🏽👏🏽👏🏽👏🏽👏🏽👏🏽👏🏽

@waverider5751 2 ай бұрын

I occasionally use my compression tester as a fuel pressure gauge, the 14mm long fine threads fit most fuel rails. Haven’t had any issues with o-rings, had this gauge since 1978, lol 😂

@ianbotts3702 23 күн бұрын

Mine was cheap as possible like $25 came advertised as doing fuel, vacuum, and compression.

@monkey11477 7 ай бұрын

Nice explanation and pace, I'll be doing this on my car once my kit arrives

@arinmastalski 4 ай бұрын

Both this and the leak down video are good straight to the point no extra bs. I really appreciate it

@JoyfulJapaneseMaples-us7on 29 күн бұрын

I ALMOST agree with you except that this video contains ABSOLUTELY NO EXPLANATION of what the "Snap" test is. He's just holding the gauge and then he's like "see?" Um no. I don't see. I don't see or hear ANYTHING about what a snap test is that you just performed

@PaulHenreid Жыл бұрын

These are some of the best automotive mechanic tutorials online. Thanks!

@MasterAutomotiveTraining Жыл бұрын

Wow, thanks for watching and for your comment! 😁

@romanjaspe4172 11 ай бұрын

Thanks so much brother. Very well explained

@javierernestotorres2422 5 ай бұрын

Excellent presentation. Your communication skills are great. Always wanted to learn automotive technology. I am electrician by trade.

@lukemabvongo9065 2 ай бұрын

wonderful tests

@SuperSpiderHulk 2 ай бұрын

very helpful and in depth

@jacktonkipkemoi4204 Жыл бұрын

Thanks my brother.... al be doing my Exams tomorrow... on how to test compression

@agustinlopez8837 Жыл бұрын

Good video well Explain and detail

@MrGattor33 Жыл бұрын

Wow very good instructional video. You've earned my sub because of how informative this is and I don't just subscribe to any KZfaq video. 🧐🤔

@woolee31221 4 ай бұрын

Thank you. That's very informative.

@MohammedAbdallahHussienMohamme 10 ай бұрын

Thank you for your efforts , what about dray and wet tests. Is it like static one ?

@zach914v8 Жыл бұрын

Great vid brother Oscar... And the new intro kicks ass!

@MasterAutomotiveTraining Жыл бұрын

Thanks Zach!

@vin605 4 ай бұрын

Thanks for sharing

@benitobarco9207 Жыл бұрын

Muy buen video profe Óscar. Saludos

@MasterAutomotiveTraining Жыл бұрын

Saludos Benito!

@user-cv3ow1zx2i 5 ай бұрын

Thank you teacher with you I will be perfect.

@peterking8722 4 ай бұрын

Hi Master Auto Training, Thank you for the nice video. In the 2nd test, i.e. the running compression test, after putting the fuse back, will it cause the problems you mentioned earlier when you explained why you needed to disconnect the fuel?

@codyshaylyn Жыл бұрын

Great video professional content

@MasterAutomotiveTraining Жыл бұрын

Thank you for watching!

@cuttthroatperformance2752 Жыл бұрын

I'm about a year and a half deep into being a dealership technician and I highly appreciate your videos

@MasterAutomotiveTraining Жыл бұрын

You are welcome and thank you for your support!

@everardocamacho5063 Жыл бұрын

Otro good video oscar saludos

@MasterAutomotiveTraining Жыл бұрын

Muchas gracias saludos

@dr.jmaglow2126 11 ай бұрын

😎👍 Hemoso y hútil video, estoy aumentando mis conocimientos Gracias. 😎👍🤚👋

@notSusNugget 6 ай бұрын

2:48 match up spark plug and compression gauge adapter length 5:25 clear flood mode (throttle pedal floored down all the way) , only some vehicles(?)

@hectorcarrillo729 11 ай бұрын

When you did the compression test - I noticed you only pulled the the one coil ,plug and not the rest of the coils ,plugs

@mrkultra1655 3 ай бұрын

Thanks

@RoverIAC Ай бұрын

yep, I gotta remove the exhaust manifold to get to three of the cylinders. Can I run the engine for the second two tests without exhaust connected? Great video. Cheers & Thanks.

@MasterAutomotiveTraining Ай бұрын

Yes you can run quickly without exhaust manifold, make sure to wear ear protection as it will be super loud.

@stevepalenicek4690 Жыл бұрын

I've always worn gloves but lately been raw dogging it brosky😂.thanks for info some of us don't have time for school

@HouseCallAutoRepair Жыл бұрын

You showed a prepared record sheet (form)... Any recommendations for where a shop can aquire various forms for testing and record keeping?

@MasterAutomotiveTraining Жыл бұрын

Worksheet is here: drive.google.com/file/u/6/d/1ffDlHM26EwTHvJf45JBfphKzt5NGkD5r/view?usp=drivesdk

@fotisrouvalis1637 Жыл бұрын

Where should I connect the oil pressure gauge in m271?

@rivera75nesto 9 ай бұрын

You rock ❤

@anomalous9448 Жыл бұрын

What do you do with a mechanical fuel pump. Meaning, disable it. I suppose I could disconnect the fuel line from the carb?

@davidthompkins9173 4 ай бұрын

8 have a v8 L92 (LS) engine, though my question is more general in nature: if you run a compression test with the engine running as you are in one stage of your video, how do you ensure that the injector isn't flooding the cylinder you are testing ? (since it doesn't have a plug in it, it won't fire but the injectors are still pushing fuel.

@ernestdamo677 6 ай бұрын

Please what about the ignition coil, should the connector removed

@TTO2016 23 сағат бұрын

At 4:52, you mention pulling out the fuse for the fuel pump for the static compression test, which I understand is to prevent fuel from entering the engine. However, at 7:29, you say to put the fuse back in for the running compression test. Won't having the fuel pump running during the running test still risk damaging the engine? Can you clarify why it's safe for the running test but not the static test? By the way, I really like the video-it's very informative!

@RussellClevenger-jw3ik Жыл бұрын

My compression test only got 40 lbs cylinder 3 the other 3 cylinders had like 160 do you think maybe bad valve

@ImtheGstoner Жыл бұрын

What if the cylinder is under the intake near the fire wall?

@kitkimbrough1145 9 ай бұрын

It's good to protect your hands using gloves, what about cleaning out the spark plug Wells before removing spark plugs??

@leorael4497 6 ай бұрын

Im kind of confused, you mentioned not too keep the fuel fuse in because it would wash the cylinder walls. Wouldnt that do that on the 2nd test ?

@cryptostack4424 5 ай бұрын

Agreed. I’m wondering if he disconnected the power from the fuel injector and just forgot to mention.

@brandonstewart7145 3 ай бұрын

Good video but I do have a question, if you disable the fuel for the static test so it doesn't damage the rings and cylinders wall then what's keeping it from damaging the cylinder when the engine is running and you are testing it?

@YvngCheese 2 ай бұрын

It's not about whether it's causing damage. It's about the fact that if fuel is being sprayed into cylinders being tested it'll effect the reading. It'll likely do one of two things. It's going to wash away anything inside the cylinder and get between the piston rings and the walls. Or the gas will act as a barrier sealing any loose gaps between the piston rings and the wall. That why there's dry compression tests, which is what he just did. And a wet compression test. Had he not diagnosed the issue using his method. The next step would've been pouring a small amount of oil into the cylinder (wet compression test) to see if it raised the pressure. The reason for this is that if you have bad rings, piston, or cylinder walls the oil will seal any gaps. If the compression doesn't change at all but is still low. That confirms that it's valves.

@shainpaskan4019 8 ай бұрын

Awesome videos !!

@53blam52 Ай бұрын

On a 2012 Toyota Corolla S for a static test when I crank it should I hold the gas pedal down? (I removed the fuel injector fuse)

@MasterAutomotiveTraining Ай бұрын

Yes.

@JoelRamos-wz7gw Жыл бұрын

Do you have remove all the spark plugs to do a compression test or one at a time?

@MasterAutomotiveTraining Жыл бұрын

If you are doing a cranking compression all off, running compression only the cylinder you are testing.

@mhawke 5 ай бұрын

You said NOT to have the fuel injectors running because it could damage the cylinder walls so did you cut the fuel to just this one cylinder for your 'running' test?

@YvngCheese 2 ай бұрын

The fuel pump is what pushes the fuel through the lines and to the injectors. The fuel pump is off cause he pulled the fuse. So no fuel is moving in the lines or going to any of the cylinders.

@ecotec4 Жыл бұрын

wheres the link in the description for the compression worksheet download?

@MasterAutomotiveTraining Жыл бұрын

Oops…… here it is drive.google.com/file/d/1ffDlHM26EwTHvJf45JBfphKzt5NGkD5r/view?usp=drivesdk

@mjenx86 7 ай бұрын

You probably didn’t get an accurate reading on your first static test because you didn’t hold the throttle open to ensure maximum airflow into the cylinder

@user-vd7nf1uq8q 4 ай бұрын

I'm kind of confused, you mentioned not too keep the fuel fuse in because it would wash the cylinder walls. Wouldn't that do that on your Running Comp test when you put the fuse back in?

@dylanreynolds4899 4 ай бұрын

Yeh makes no sense

@chazilton 3 ай бұрын

Washing those walls running all the fuel in cylinder 3 😂

@brandonstewart7145 3 ай бұрын

That's what I'm saying, I don't think I've ever seen someone check the compression while engine is running.

@waverider5751 2 ай бұрын

Me neither, but he could’ve easily disconnected the fuel injector from #3… This a GDI engine? Those pump a lot of pressure (~1500-3000 psi) directly into the combustion chambers, I know it’s definitely something to consider when working with GDI engines.

@kcvance1974 2 ай бұрын

I was thinking same thing, a better explanation would be nice

@nicolaspinto2927 11 ай бұрын

Many vehicles mostly fours have rail cops rather than individual cops, how would you take more than a static compression on those vehicles? The only workaround I could think of is just sticking wires on the plugs and running them into the coils but that surely impacts performance in a way that is unacceptable for valid data.

@user-rg2pv6tj4t 29 күн бұрын

Like it good

@MasterAutomotiveTraining 28 күн бұрын

I'm glad you like it, thank you.

@sniperpaintcorrection6790 Ай бұрын

I have combustion gases in my coolant I used a block tester . Everyone says blown had . But my car isn’t over heating and I don’t have smoke coming from my engine . Coolant keeps getting low. Can’t find any leaks outside . Hoses look good . Oil looks clean . Is this a test I need to check?

@MasterAutomotiveTraining Ай бұрын

Does your car have an EGR cooler? kzfaq.infoOCKY0ew_oHY?si=H2BJzzIycjAiqJpK

@imanolmorales6955 Жыл бұрын

During Snap Test: what pressure reading will you get? Let’s say if EXHAUST WAS RESTRICTED instead of low pressure of 100psi from intake or exhaust valves than 116psi. 😮 10:13

@habtamuadebeb-jv5ut 3 ай бұрын

I don't understand why you are not open fully throttle valve ,when you undergoing static compression test ?

@SMASHERJP 20 күн бұрын

My engine is overheating and I can't do a running compression test because if it get too hot, I don't want to damage the engine. Any suggestions?

@Thapaking9595 5 ай бұрын

How much compression pressure should be in petrol engine and diesel engine

@MasterAutomotiveTraining 5 ай бұрын

That’s dependent on the engine. It’s always best to test a known good vehicle and begin to build your data base. Most manufactures no longer give us that spec in service information.

@sniperpaintcorrection6790 Ай бұрын

I was told to take the coil wire off my distributior cap also. I have a 95 VW . Is this true?

@MasterAutomotiveTraining Ай бұрын

You can also do that or ground one by one cylinder.

@DanielDroegeShow Ай бұрын

I don't understand. First you said we pull the fuse for the fuel pump because we will damage the engine if it is left in and then we put it back in and run the second test. Why does the 2nd test not damage the engine, get gas in the crankcase, etc.? What am I missing here?

@MasterAutomotiveTraining Ай бұрын

We didn't capture it but the fule injector should be disconnected to prevent fuel entering the cylinder while doing a running compression and snap compression test. Great question.

@DanielDroegeShow Ай бұрын

@@MasterAutomotiveTraining Thank you for being so responsive and creating such helpful videos.

@MasterAutomotiveTraining Ай бұрын

@@DanielDroegeShow You are very welcome, thank you for watching!

@MartinWibert Жыл бұрын

Seems like you may have forgotten to disable fuel delivery to that cylinder after reinstalling the fuel pump fuse? Otherwise, great tutorial video!

@briancooks3142 Жыл бұрын

What do you mean by that?

@MartinWibert Жыл бұрын

At the beginning he wisely defeated the fuel delivery for the static test. Later he put the fuel pump fuse back in but then did not disable the injector for the cylinder he was testing. This could explain why he didn’t get the 50% number he was expecting.

@kayjay4060 7 ай бұрын

@@MartinWibertI was thinking the same thing. He never went over if he did or didn't, and I suspect he didn't.

@info411 10 ай бұрын

I thought it's a requirement to remove all spark plugs when do compression test? I suppose it can't work if we are looking for a comparative data between all cylinders.

@mjenx86 7 ай бұрын

You’re correct- to get comparative readings on a static compression test you have to remove all spark plugs. You also need to hold open the throttle blade or remove the throttle body to get maximum airflow in the engine for all cylinders

@lilgagey3889 3 ай бұрын

thats why you cut off the fuel

@bryantknapton668 4 ай бұрын

So when doing a running test. You disconnect power supply injector.

@jantelow 6 ай бұрын

How to test if oil rings are worn or damaged?

@victoriagirdler4795 Ай бұрын

If compression is low on that cylinder, spray some oil down in that cylinder. Re do the test. If it's piston ring wear, it'll read better for the time that oil is in there filling in the gaps. If it makes no difference, it's not ring related.

@leorael4497 6 ай бұрын

Can I just do a static test to check compression?

@MasterAutomotiveTraining 6 ай бұрын

You can but without a dynamic (running compression) you’re not testing the engines ability to breathe and exhale (volumetric efficiency). Wont be a complete test if you skip running.

@leorael4497 6 ай бұрын

I'm kind of confused, on the 2nd test you put the fuse back , I thought the fuse wasn't supposed supposed to be in because of fuel going into the piston washing the cylinder walls

@rowdawg12 Жыл бұрын

I understand this but I don’t..lol I’ll leave it up to you the mechanic to figure my car out !

@Snail_Shell 7 ай бұрын

Is that an ice cream truck playing music in the background?

@MasterAutomotiveTraining 7 ай бұрын

He passes by everyday 😂

@turbot6592 Жыл бұрын

I see some people crank the cars until the needle stops then takes a compression reading

@dennisgross4266 11 ай бұрын

Harbor freight, got a kit for 30 dollars

@marks1994 7 ай бұрын

Good video, but the generic music is very annoying and distracting.

@andyashcroft9316 Жыл бұрын

your first test is dynamic NOT static compression!!

@MasterAutomotiveTraining Жыл бұрын

Unfortunately a cranking compression test is called a static test. “Begin with a normal ("static") compression test on a warm engine to eliminate obvious problems such as badly worn rings, burnt or bent valves or holes in pistons.” - AllData