How To Perform a Compression Test - [EASY]

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!

#enginecompressiontesting #compressiontest

[arinmastalski]

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

[TTO]

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!

[PaulHenreid]

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

[leorael]

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 ?

[cuttthroatperformance]

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

[MohammedAbdallahHussienMohamme]

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

[javierernestotorres]

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

[JettaRedIII]

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?

[anthonyportelli]

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.

[hectorcarrillo]

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

[WatchNFLNetwork-mw]

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?

[monkey]

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

[jacktonkipkemoi]

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

[raymondtrevino]

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

[RoverIAC]

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.

[JoelRamos-wzgw]

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

[robertobetancourt]

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

[notSusNugget]

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(?)

[peterking]

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?

[waverider]

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 😂