How To Perform a Compression Test - [EASY]

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

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

How to test if oil rings are worn or damaged?

Please what about the ignition coil, should the connector removed

Can I just do a static test to check compression?

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 ?

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

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

Thank you teacher with you I will be perfect.

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?

Thanks for sharing

Thank you. That's very informative.

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.

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?

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

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?

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

Why do people play music in instructional videos? I had to turn off this video because the stupid rock music in the background.

Thanks

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

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?

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 😂

wonderful tests

very helpful and in depth

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

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?

You suck at this

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)

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?

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.

Like it good

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?

I have a strange issue with my engine

Min sped for hot compression test is 133 standard value is 188

My tests are

#1 130psi
#2 133psi
#3 140psi
#4 136psi

My leak down test is

#1 24% (rings)
#2 10% (rings)
#3 10% (rings)
#4 14% (rings)

I'm trying to figure out why my compression is kinda low on all cylinders but the leak down test is in spec

How can you do a running test if your coil pack is all one piece for all cylinders?

Question: If you don't want fuel building up in your cylinder and gauge during the static test, how do you keep that from happening when you perform the 2 other tests?

How did you connect the gauge during the running test? Was it still screwed into the spark plug hole? Did you disconnect the fuel injector electrically? How did you keep fuel out of the cylinder?

great video!

Very good explanation,thank you dear

How do you do the static test on a push start?

Do you offer training for technicians in the field?

Great video, very clear and very well explained. You are a brilliant communicator. 20 seconds for an intro however these days is way too long. needs to be 5-10 seconds max IMO.

Great video! Simple, clear advice! Thanks! Liked and subscribed!

During the first compression test, why does the pressure keep going up (5 times) and not go down when the valves open making the air leave the cylinder ?
Obviously I'm assuming valves are opening. Am I missing something ? (I certainly am and I'm sorry for a possibly dumb question)

Excellent thank you

I’M A LITTLE CONFUSED. IF YOU COULD ELABORATE A LITTLE MORE. I THOUGHT YOU SAID YOU DIDN’T WANT GAS GOING TO THE CYLINDERS BECAUSE YOU COULD WASH THE CYLINDER OR ENTER THE CRANK, THAT WAS THE REASON FOR UNPLUGGING THE FUEL RELAY OR FUSE. HOWEVER, LATER YOU ALLOW GAS TO ENTER. WOULDN’T THE SAME THEORY HOLD TRUE? THANKS FOR SHARING YOUR KNOWLEDGE AND HELPING US ALL TO UNDERSTAND THE DIFFERENCES.

Just found this channel as i was searching for some nice explanation on how to perform compression test and this tutorial is so good! No bs, straigh to the point and everything explained nicely in details! Love it! Subbed, thank you!

I got Confused about the snap test, it should be at least 80% of 145, you got 100 and that's the approximately correct amount,
But you stated that it should be 160 psi?!
Thanks

I was confused when you started the engine when the spark plug and coil had been removed.