Im not a mechanic by any means but this guy really has the ability to take a topic and make it understand, I fully understood everything he said, great explanation, great details and great tone of voice. Thanks
I'm 26 years old and have been into Japanese cars my whole life, I've never used a vacuum gauge to work on them nor did I ever know what one was for. my grandfather gifted me his old 68' dodge dart and I needed a vacuum gauge to set the idle mix screws on the carb. after watching your video I feel like I may be able to apply vacuum gauge diagnostics to a lot more than I once thought, from my 67 dart, to my 87' BMW, and my personal favorite my 07' Subaru. old mech vacuum gauges are valuable for any engine, because at the end of the day an engine is really just an air pump. Thanks for the video, I appreciate that you made it.
you should be able to set your carb by turning screws out around 2 turns out and then use vacume gadge to get highest reading with each screw +turn them in until gadge drops then back out about 1quarter turn. do this with both screws. then adjust curb idle to specs.
By the time that i watched 50% of this tutorial, i had realized that it was the best ever explanation that i had ever seen on the "underated use of a vacuum gauge". Would i be wrong in thinking that the same principles/tests could still be applied to modern engines? After all, what happens inside an internal combustion engine has not changed, but rather, it's how it happens that has changed, i think! Thank you very much, for a great video. Joe
Yea you can use it on the new puny engines. Its less expensive than the cost of an automotive computer diagnostic tool, and just as, if not more effective. Maybe not efficient, but effective. A man tuning in the dessert would damn sure rather have a Guage than a computer where there's no internet nor man around who is a mechanic he can push his problem off on.
Sir... I truly appreciate your approach to teaching new motorheads, like me, about what means what. Keep these lessons, and style of teaching coming! ATW! Chris
WOW!! As an amateur mechanic, this is some AWESOME information!! THANKS SO MUCH for sharing your knowledge in such a way that a beginner like me could easily digest it!!!
This is the best explanation of vacuum I have found on youtube. There's been a short lag in posting from MossMotors this month, and I'm glad to see more. Of course any test can lack specificity, and vacuum testing is no different. The hardest part for a neophyte is to get all the possible explanations in proper order, so the most common cause of a problem is investigated first. Thanks again.
Wow thats the best explanation i have ,ever seen on you tube. Butifully,spoken,very clear and methodical.keep up the superb work. Thanku steve from the uk.
I bought my 1967 MGB new and installed a under the dash vacuum gage for fuel economy! Now for the first time I understand what the gage and engine of my car is telling me. This video was excellent!
they are good to have+i put one on my grand prix. now with a long vacume hose+reading can and should be a little less but still good. and heater blower may drop the numbers just a touch. but i check mine alot. i added.a glass pack on car and it brought vacume up a touch+and power went up too. but loud inside car a little. 18" is the preferred #. every 1000 ft above sea level vacume will go down 1")
7 months and no videos from my friend at Moss Motors. These are a great set of videos and I want you to know that you've built a fan base that needs feeding (grin).
That's a great video. I like your real life analogy. I always try to come up with one when studying it this way I have an image for the theory. I always use traffic jams and exit ramps in electrical explanations .
My dodge stays high above 25 at idle and i get a P0300 random misfire code. What could it be. Restricted intake? Do u think a bad Throttle body position sensor would cause that.
Great video! I have a Winnebago that sits on a Chevrolet P30 chassis with a 7.4L 454 V8. On the thermostat housing there are four nipples where vaccuum lines 'dead end' into. These are ported lines. There is a copper plug in the thermostat housing that takes its cue from the coolant temp. How does the temperature of the coolant activate the vaccuum. One of the lines goes to the EGR valve and is not pulling any vacuum to the EGR. David 🐈
Best video I have ever sean about car mechanics, great job! Realy great video. If I understand, I can put that vacuum gauge wherever on the intake manifold of my car? My car is brand new hyundai i20, and it has injection system, but it doesn't matter is it injection system or carburator, isn't it?
Great video. However modern cars usually has either a MAP or a MAF sensor and a select few may have both. The computer uses these sensors to determine engine load. A vacuum is still a very useful tool even on today's engines. However vacuum leaks are best determined by using an EVAP smoke machine. A Leak Down Tester can tell you a lot too. TH-cam has videos on how to make your own EVAP smoke generator and how to use a Leak Down Tester. Harbor Freight has low cost vacuum gauges and Leak Down.
Could that one-cylinder rhythmic issue be a ring? I have 178-190 across all cylinders. Most 182-186. The 178 cylinder has a leakdown issue of some kind, but extremely difficult to determine the source. About 3/4" fluctuation 5 times per second or so
Thank you sir for this lesson. I've ordered a vacuum gauge from Aliexpress along with several brass fittings for connections to 6mm and 8mm vacuum hoses to do a test on my car. I do have a car equipped with Bosch monopoint injection Mono-Jetronic A2.2. Do you know if this will affect the typical manifold vacuum of 19 inHg? What would be a healthy vacuum for my car?
I'm adding to my comment of just a moment ago. Leak Down Testers can pinpoint more problems but takes more time to use and you must have a compressed air source. Videos on how to use one are here on TH-cam. EVAP smoke machines are too expensive to buy--make one. Get a cheap vacuum gauge and a cheap Leak Down Tester from Harbor Freight to complete your set of diagnostic tools.
you mentioned the map sensor . what about maf sensor is it the same ? can we know if there a vacuum problem in modern cars by reading the map or maf sensors feedings ?
Ok. I found one rubber vacuum hose located on the intake duct between the air filter and air flow meter. Other end of that hose is located on the cylinder head. Is that hose correct for mounting plastic "T" and vacuum gauge on it?
Approx 6:40 in says why vacuum gauges still have a place. You can see things like sticking/closed up valves as fluctuations in the column ( mine are manometer ). With a bit of work and thought, a set of gauges still has a place as they don't get confused by broken or cracked wiring. No bloody obscure fault codes!. If you have a motorcycle, or car with multiple throttle bodies, a vacuum gauge is the best way to balance the carbs/throttles after a service.
I dont understans why a hose would go to the head. What you can do is slide one end off, preferably the intake duct end, and put your finger on the end. Do you feel it sucking on your finger? If there's always vacuum its a good one to use. Some vacuum lines only activate once the engine has warmed up.
Thank you.mine has been idling at 5 since I fitted it.i always believed its my carb to manifold having a leak.will get a new gasket.thanks a lot for this video very helpfull.
Sory, I understand now, it is not correct hose. Hose must be after throttle body (between throttle body and intake manifold). I found one like that, but it is very difficult to reach it :-) Thanks a lot!
look for a spot where there may be a capped-off vacuum port (with a rubber cap). Otherwise you can purchase a pkg of T's that you can share a vacuum line with.
Im not a mechanic by any means but this guy really has the ability to take a topic and make it understand, I fully understood everything he said, great explanation, great details and great tone of voice. Thanks
I'm 26 years old and have been into Japanese cars my whole life, I've never used a vacuum gauge to work on them nor did I ever know what one was for.
my grandfather gifted me his old 68' dodge dart and I needed a vacuum gauge to set the idle mix screws on the carb.
after watching your video I feel like I may be able to apply vacuum gauge diagnostics to a lot more than I once thought,
from my 67 dart, to my 87' BMW, and my personal favorite my 07' Subaru.
old mech vacuum gauges are valuable for any engine, because at the end of the day an engine is really just an air pump.
Thanks for the video, I appreciate that you made it.
you should be able to set your carb by turning screws out around 2 turns out and then use vacume gadge to get highest reading with each screw +turn them in until gadge drops then back out about 1quarter turn. do this with both screws. then adjust curb idle to specs.
By the time that i watched 50% of this tutorial, i had realized that it was the best ever explanation that i had ever seen on the "underated use of a vacuum gauge".
Would i be wrong in thinking that the same principles/tests could still be applied to modern engines?
After all, what happens inside an internal combustion engine has not changed, but rather, it's how it happens that has changed, i think!
Thank you very much, for a great video. Joe
Yes. You absolutely can use a vacuum gauge on a modern engine.
Yea you can use it on the new puny engines.
Its less expensive than the cost of an automotive computer diagnostic tool, and just as, if not more effective. Maybe not efficient, but effective.
A man tuning in the dessert would damn sure rather have a Guage than a computer where there's no internet nor man around who is a mechanic he can push his problem off on.
Great information... I can't help but to think of Bob Ross at times while you talked...
I really enjoy moss motors videos. Very well explained. Nothing like having a good teacher.
Sir... I truly appreciate your approach to teaching new motorheads, like me, about what means what. Keep these lessons, and style of teaching coming!
ATW!
Chris
i have looked at pics of gauges i have done the forums on all the sights and this is by far the best explanation ive seen!
WOW!! As an amateur mechanic, this is some AWESOME information!! THANKS SO MUCH for sharing your knowledge in such a way that a beginner like me could easily digest it!!!
the bob ross of engine repair.
More like Mr. Rogers
This is the best explanation of vacuum I have found on youtube. There's been a short lag in posting from MossMotors this month, and I'm glad to see more.
Of course any test can lack specificity, and vacuum testing is no different. The hardest part for a neophyte is to get all the possible explanations in proper order, so the most common cause of a problem is investigated first. Thanks again.
Been a cane diy mechanic, for years and that was very interesting and educational. Thanks
Wow thats the best explanation i have ,ever seen on you tube.
Butifully,spoken,very clear and methodical.keep up the superb work.
Thanku steve from the uk.
Video of the year for me. I needed that.
Super appreciate the bob ross tone of voice and baby birds to valves analogy.
I bought my 1967 MGB new and installed a under the dash vacuum gage for fuel economy! Now for the first time I understand what the gage and engine of my car is telling me. This video was excellent!
they are good to have+i put one on my grand prix. now with a long vacume hose+reading can and should be a little less but still good. and heater blower may drop the numbers just a touch. but i check mine alot. i added.a glass pack on car and it brought vacume up a touch+and power went up too. but loud inside car a little. 18" is the preferred #. every 1000 ft above sea level vacume will go down 1")
18" steady needle at idle= normal engine.
You are a great communicator and instructor!
Thank You👍
I have a vacuum gauge all this 20 plus years n didnt even know how to use til right now. Thanks 🙏 for a very well explanation!
7 months and no videos from my friend at Moss Motors. These are a great set of videos and I want you to know that you've built a fan base that needs feeding (grin).
great video, any chance you could do a hands on test? maybe demonstrate each scenario. Burnt valves, vacuum leak, worn rings etc?
That's a great video. I like your real life analogy. I always try to come up with one when studying it this way I have an image for the theory. I always use traffic jams and exit ramps in electrical explanations .
There's a problem with the audio! This content is too good to be lost !!!!
Simply excellent, indispensable in tuning your engine, it's beyond guessing. Thx!
Excellent video!! Great explanation of how to diagnose problems using a vacuum guage.
your explanation is fantastic. as a layman...i thank you
Very good direct simple important information. Thanks.
My dodge stays high above 25 at idle and i get a P0300 random misfire code. What could it be. Restricted intake? Do u think a bad Throttle body position sensor would cause that.
Great video! I have a Winnebago that sits on a Chevrolet P30 chassis with a 7.4L 454 V8. On the thermostat housing there are four nipples where vaccuum lines 'dead end' into. These are ported lines. There is a copper plug in the thermostat housing that takes its cue from the coolant temp. How does the temperature of the coolant activate the vaccuum. One of the lines goes to the EGR valve and is not pulling any vacuum to the EGR. David 🐈
Love this channel's content.
Good stuff! I'm going to check out your other videos.
Best video I have ever sean about car mechanics, great job! Realy great video. If I understand, I can put that vacuum gauge wherever on the intake manifold of my car? My car is brand new hyundai i20, and it has injection system, but it doesn't matter is it injection system or carburator, isn't it?
Great video. However modern cars usually has either a MAP or a MAF sensor and a select few may have both. The computer uses these sensors to determine engine load. A vacuum is still a very useful tool even on today's engines. However vacuum leaks are best determined by using an EVAP smoke machine. A Leak Down Tester can tell you a lot too. TH-cam has videos on how to make your own EVAP smoke generator and how to use a Leak Down Tester. Harbor Freight has low cost vacuum gauges and Leak Down.
Fabulous video, I learned so much, thank you.
Great simple explanation ! 👍
@Jafromobile Thanks for liking this and showing your subs Jafro. Much appreciated
Could that one-cylinder rhythmic issue be a ring? I have 178-190 across all cylinders. Most 182-186. The 178 cylinder has a leakdown issue of some kind, but extremely difficult to determine the source. About 3/4" fluctuation 5 times per second or so
This test vacuum is for all petrol and gasoline?
Also if a vacuum leak is suspected I spray lines with brake clean. Out this awesome for internal leaks.
Thanks for the info. I have a 1992 Talon TSI AWD. ALl this applies to my car as well. Keep up the good work. I subscribed and liked.
hi body, great video, one question, if i have a comp camp installed? can cause a variation reading in vaccum gauce?
Thank you sir for this lesson. I've ordered a vacuum gauge from Aliexpress along with several brass fittings for connections to 6mm and 8mm vacuum hoses to do a test on my car. I do have a car equipped with Bosch monopoint injection Mono-Jetronic A2.2. Do you know if this will affect the typical manifold vacuum of 19 inHg? What would be a healthy vacuum for my car?
great video, now iam empowered with my new vacuum gauge i can diagnose my old Ford :)
Is there any way to use a Peter pump is a vacuum gauge?
Excellent video!!!
very clear explanation. kudos to you, sir!
I'm adding to my comment of just a moment ago. Leak Down Testers can pinpoint more problems but takes more time to use and you must have a compressed air source. Videos on how to use one are here on TH-cam. EVAP smoke machines are too expensive to buy--make one. Get a cheap vacuum gauge and a cheap Leak Down Tester from Harbor Freight to complete your set of diagnostic tools.
Now what kind of effect does Boost have? Because when my supercharger kicks in I'm pushing pressure not vacuum
you mentioned the map sensor .
what about maf sensor is it the same ?
can we know if there a vacuum problem in modern cars by reading the map or maf sensors feedings ?
Ok. I found one rubber vacuum hose located on the intake duct between the air filter and air flow meter. Other end of that hose is located on the cylinder head. Is that hose correct for mounting plastic "T" and vacuum gauge on it?
Excellent, thank you!
Approx 6:40 in says why vacuum gauges still have a place. You can see things like sticking/closed up valves as fluctuations in the column ( mine are manometer ). With a bit of work and thought, a set of gauges still has a place as they don't get confused by broken or cracked wiring. No bloody obscure fault codes!. If you have a motorcycle, or car with multiple throttle bodies, a vacuum gauge is the best way to balance the carbs/throttles after a service.
I think so, where do I put the hose?
I dont understans why a hose would go to the head. What you can do is slide one end off, preferably the intake duct end, and put your finger on the end. Do you feel it sucking on your finger? If there's always vacuum its a good one to use. Some vacuum lines only activate once the engine has warmed up.
Very good explanation nice video. . Thanks
Great explanation!
my left ear loved this video
Splendid tuition,
What causes cranking vacuum to rise and fall
Great instructions, thanks
Super informative, thank You :)
i usually run 18" but sometimes hangs down 1"- 2"so im reading it can be a weak ignition coil. but car runs good.
awesome explanation!
What if your needle oscillates around 17.5 to 18.5 inHg?]
Thank you.mine has been idling at 5 since I fitted it.i always believed its my carb to manifold having a leak.will get a new gasket.thanks a lot for this video very helpfull.
Enjoyed your tutorial, THX!
Real good advice, thanks
Super helpful video
great great great explain thanks man
very neat and interesting, thanks!
Great job
you sir are the master ,thkx
Great video!!!
Analog > digital tuning.
Digital has a bandwidth.
Analog is unlimited.
What happened to the audio?
Nice vid dude, thanks.
Please , the sound is totally missing , fix this please , last comment was from a week ago , I think it is defective only lately then
Very interesting! Thanks!
Wow. That was informative and beautiful
awesome video thanks
AOL in the background! Or a fax machine
very informative
i. understand vacuum... thank you sooo much.
can be used for diesel engine
росен ковачев negative, most diesel engines don't produce much vacuum if any at all
@@chriswebster1830 correct, as diesel has no throttle body, in petrol terms, they ar always at wide open throttle
Sory, I understand now, it is not correct hose. Hose must be after throttle body (between throttle body and intake manifold). I found one like that, but it is very difficult to reach it :-) Thanks a lot!
awesome video. like it
great vids!!!!
I find that the 70s and 80s vehicles have SOOOO many vacuum lines that they are a prime source for vacuum leaks.
look for a spot where there may be a capped-off vacuum port (with a rubber cap). Otherwise you can purchase a pkg of T's that you can share a vacuum line with.
Thanks
SMART MAN THANKS!!!
#$ck yeah , THANK YOU SO VERY VERY MUCH ..i have a 62 f100 - 302 ..i do not know any OG's to help me .
thank you!!!
AWESOME
My engine at idle was 20 inhg but at 2500 was 26 inhg and shake all car, without air filter nothing change please help.
MAP usually stands for "Manifold ABSOLUTE Pressure"
Good vid though
did i go deaf or what happened =o i don't have sound for this video for some reason.
Someone get this auto technician an audio technician
mmmkaaaaay
no difference
good video with good information, but your voice is putting me to sleep......lol
the sound you while u stop talking is annoying me dude