HOW DO YOU TEST AN ENGINE VACUUM? | Step by Step
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- เผยแพร่เมื่อ 19 ก.ย. 2022
- Have you ever asked yourself:
- How do you test an engine vacuum?
- What does an engine vacuum test tell you?
- What is normal vacuum for an engine?
- How vacuum test is done?
Let me show you step by step how to run a cranking, running and snap vacuum test!
Grab your tools, lets get ready, lets hit it!
#enginevacuumtesting #vacuumtest
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![How To Perform a Compression Test - [EASY]](http://i.ytimg.com/vi/3VmmL0YAO14/mqdefault.jpg)
![How To Perform a Compression Test - [EASY]](/img/tr.png)
The vacuum gauge is the most under used diagnostic tool and its filled with overlooked valuable information. Agree?
100%, its the most powerful yet underutilized tool! I have used a vacuum gauge to find many of those hard to find issues. Plus if you can't use a vacuum gauge then how can you use a delta sensor with a scope to monitor vacuum? I agree vacuum gauges need more use guys!
@@MasterAutomotiveTraining The issue with vacuum gauges is that you cannot reliably diagnose Atkinson cycle engines as they do not have much of any steady intake vacuum (as they actually push air out from the cylinder in part of the compression stroke, which nullifies manifold vacuum). If you use a vacuum gauge on an Atkinson cycle engine, then it will read near zero at all times. This is the reason why Toyota uses separate vacuum pumps to supply vacuum for most of their engines in the last 10-15 years. It is also why they don't have any testing procedure that involves testing for vacuum for nearly anything engine related.
So right off the bat that one of the US' largest car manufacturers where you can't use vacuum gauges for diagnosis. They're great, but they have some severe limitations.
That, and using a smoke machine to find leaks (Exhaust, intake, etc)
@@LordOfSilense
Would it be good to use on Saturn engines? I have a Saturn Ion-2 2.2 and think i might have a vacuum leak
That's so true! I can't find the issue with my 289cui and now iam hoping to get it diagnosed with the vacuum gauge!
Great presentation, verbally excellent, no pauses. Amazing 🤙🏼
This is the most informative video I've seen on how to use a vacuum gauge. Thanks
Awesome video. I'm 71, in our days all of us gear heads used this gage. Great job
Thank you, my mentor showed me the power of it and I still use it to this day.
No matter how much you know, the matter is how to teach someone about what you know, you really very good teacher
Old school never go out of style! It just requires time for the new school kids to catch up!
Old school always works, I use the crap out of my vacuum gauge. lol
Excellent lesson ! You are an excellent coach !!
Very informative. Very professional. Just a tech trying to get better, thank you
Fantastic video. Huge thanks my friend.
Love it. Well done
Very nicely done, I have been using vacuum gauge professionally since 1989 and all these kids just look at me like I'm insane. But my diag time is better than there's.............🤦
Excellent presentation and very informative! Thank you!
Thank you
Excellent presentation, thanks
nice video, I've been enjoying these so far. I'd like to hear your explanation for the "why's"... during snap test, why does vacuum go to zero on a healthy engine, but actually climbs if the exhaust is restricted.
At wide open snap throttle the butterfly valve at the throttle body is completely opened up to atmospheric air …. therefore, no difference in pressure exists - in other words; no vacuum can be created .
Thanks for sharing your knowledge ! Very useful in refreshing my mind as a mechanic of unused knowledge.
Awesome video learned alit in the short period of time thanks
Great explanation well done
thank you very much very helpful and easy method
Muy buenos en video profe Oscar se sigue uno refrescando la memoria con este tipo de informacion
Great information. Thanks Oscar 👍
Great job good info and simple . I like simple
Thank you, very useful information explained very well.
Glad it was helpful! 😁
Thanks Bud !
outstanding!
Am from Kenya and that an easy explanation for one to understand 👍
Great video.👏👏
TY VERY MUCH. VERY KIND AND INFORMATIVE.
Great video!!!!!!!
Good video thanks
Te has ganado un suscriptor más.
Great video Oscar!
Your videos are amazing.
Thank you! Thank you for your support!
🤘🤘nice work
thank you so mush for this helpful information
You are so welcome! Glad it helped.
Nice tutorial I’m in👍👍
Great video 🎉
Thank you 😁
Wow very good informative video.
This is a good video. I would like to know more about vaccum testing setups ( Connections to the car).
Great suggestion! Coming soon!
Thanks for share
My pleasure.
Very good presentation brother.
Many many thanks
Thanks 🙏
Talent mechanic
Nice good video thanks
Superbly informative. Thank you very much...
You are welcome, thank you for watching.
Great information. My 289 is running at idle only 8 inches of vacuum. I will try your cranking test. I was hoping the problem was the intake manifold and not the valves
Excellent i want to learn more👏👏🤗🤗
awssome thank you for your time
Great video, a suggestion is use the vac gauge and show how to troubleshoot the PCV System. The most unchecked and misunderstood system under the hood.
Can loss of engine compression effect the brakes. The following dashboard lights stay on. Check trailer brake system, check brakes, traction control off, stabil-trac off and cruise control don't work. I've replaced everything except the brake booster and master cylinder.
Yes, since low compression creates less vacuum, will create less negative pressure on the front of your brake booster leading to lessened brake effect. Do you feel any braking problem?
My brake caliper cylinder stuck even new caliper. I change brake vaccum hose but still caliper cylinder stuck & brake Rotor get hot.
Is any body know what will be problem.
Excellent Job. Clearly taught for understanding. Will be looking at your other videos also. Again you did a great job. However I would like to see videos on more Classic cars like my 76 Corvette. SMILE- Thanks
Damn bro thank you for share that knowledge 👌🏼
Great explanation
It’d be highly appreciated if you make a video about fuel trims
You are not just a mechanic but instructor
Nice.
Great video and explanation...but you can use the metal pipe at the brake vacuum booster, as long its towards the intake manifold. A small distance away you are at the intake manifold. Great video.
great video- I followed the rabbit hole here from the affect valve lash has on vacuum--would be great to see a video on valve lash and how to do it properly
Thank u very much
You are most welcome
Hola Oscar,muy agradecido por tan informativo video, pregunto,por casualidad haces también en español?Pues mi inglés no es tan bueno.Muy pero muy agradecido.Bendiciones.
Love this quality content! Was wondering how i could tap into my 91 chevys system to test vaccum. I got a 5.7l v8 TBI and dont know where id connect a vacumm gauge at...
Great video oscar I just you in youtube today,and I like lt very much, I suscribed also to your channel, thank you and cheers from Ontario ca, I will keep watching tus videos, later
Ronnie from belgium 👍
Thank you for the detailed explanations. Is Vacuum Gauge Test better than Smoke Machine Test? How do they compare on small and large leaks? Do you have any films on Smoke Machine Testing. I need to learn better where exactly to connect the hose w/smoke for different tests. Thank you again, really good film.
You ask for a comment to be better, sadly this video is just perfect.
Thank you for those kind words!
This is a great video. Very useful. I am working 2003 Honda civic AKA Honda Accura 1.7 L. What is the best place to hook up the gauge?
Do you have any videos for the A1 test? I learn a lot from your videos. Thank you for posting them.
great video Oscar, how about a fuel pressure video
This is excellent information! I really appreciate it. Question, is the vacuum test on a running engine, if it shows an acceptable inches of mercury range and the needle is not shaking, is that definitive enough to say the internals of the engine are relatively healthy? Would that be so reliable that I wouldn't even have to do a compression test?
Great video!
Can we use vacuum gauge to set idle mixture?
amaziiiing
Thank you!
really enjoyed it, never thought to use it on car purchasing. also on newer cars with obd-2 scanner will the readings on that work the same?
Thank you for these beautiful solutions. What about if you want to buy a car, and check it through the computer, especially since the car contains an internal computer that carries all the faults with codes, stores them, and displays them in case of examination
It's a good idea. However the codes might have been cleared by the seller just before you scanned it, so your Check Engine Light will be off. And then the light may come on on your way home.
Great video bro and thank you🙏 Does it matter which hose you pulled off the purge valve I noticed there were two ports/
Thank you for watching, use the hose from the solenoid to the intake manifold to run the vacuum test.
How about the vacuum test on a turbo charger engine is there any way to check to vacuum ?
great video, ,my 2011 tacoma is sluggish when passing another auto or going on overpass. Toyota could to find the problem. I later found a PO456 code (means a small Evap Leak). I can not figure it out. Thanks
Hi. I have a question. Today I purchased a vacuum gauge to check for vacuum leaks and I got a steady reading at 15 nothing less nothing more it just stay at 15. So what does this mean if you don't mind?
The selanoid valve has two hoses
Which one you use for the test? Thanks
Thanks for the video. İ have a question. İ bought a vacıum gaıge but İ don’t know where to install it on my 1999 model 1.9 TDI passat. Would you please where is the best point on my engine ? Thanks in advance.🙏
I have a ford escape v6 2012, I can't find the vacuum line where to hook it up
I have the same engine in a 2006 Nissan Sentra and theres air blowing out of the oil cap after removing it. I read this was normal and was wondering if i could do a crankcase psi test with a vacuum gauge and how? Thanks
Dose the fuel pressure regulator’s vacuum go to 0 when you are at full throttle
Is it work on turbocharged or supercharged engines ?
Still the readings same as old engines ?
Can we see the vacuum tests with bad engines. Is that possible? One with burnt valves. Outta time , exhaust restriction etc
great video but could you do i video on ecoboost engine with vacuum pump running of camshaft ford f150 3.5l at idlle im getting only 13inch/hg brake pedal very hard
once you unhook a vacuum line wouldn’t that cause a vacuum leak on the side your not hooked In to? Or do you just plug it
Hi what is proper vacuum for single cylinder engine
A follow-up video showing bad engines?
What does it tell you when vacuum is low when testing engine vacuum? Thks
Hi does this test work on turbo charged engines and cars with VVT systems.cheers.
Hi Sir. Tell me please petrol engine and diesel engine have the same reading. Thank you.
just a quick qustion,would this test work on a diesel engine(or certain diesel engines)
I'm testing an MGB engine and the needle is flicking and not stabilising. Would be good to show a variety of faults such as this in your vids I think so we guys have a clearer picture..
Thanks
Is this result work with all vehicles or there is definitely between V8 and V6 or V4
Should I increase idle rpm a little bit and ignition advance to increase vacuum pressure if its at 45cmhg?
45cm hg is equal to 17 hg” no need to rev it, you are within proper spec.
what would a boucing needle indicate on a vacuum test
Como checar fuga de vacio con el vacuometro
So, in crank and no start situation testing with vacuum gauge is like RC testing? At least overall engine mechanical status.
Slightly on an RC you’ll see if one or more cylinders are low on compression. While a cranking vacuum would be more for all cylinder like a chain or timing belt out.
What if the vacuum gauge is erratic and also reading low? It's a 2008 Buick Lucerne
I read your question, does the Lucerne also have a drivability concern? Mil? DTCs?
I’m taking classes at Alameda college East Bay 2nd Semester and i would like to have an instructor like you body .Do you have a on line program? Or some kind of 2 weeks intensive and program for beginners with some basic knowledge in mechanics?
What fuse you remove it
Fuel pump fuse. 😁
My brake caliper cylinder stuck even new caliper. I change brake vaccum hose but still caliper cylinder stuck & brake Rotor get hot.
Is any body know what will be problem.