Diagnosing Problems with a Vacuum Gauge
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- เผยแพร่เมื่อ 10 พ.ค. 2018
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A vacuum gauge is a valuable tool in diagnosing problems with your car. From poor performance to bad braking, the vacuum gauge can help you find the root of many problem. Mark Simpson demonstrates how to perform an accurate engine vacuum test. - ยานยนต์และพาหนะ
I had to replay this for the intended educational purpose , speaking as a seasoned videographer the camera work , editing , blew me away !!!! Job well done !!!
Thank you for old schooling it. I'm tired of diagnosis videos saying, the code reader says p####. Let's replace it.
I’m learning real quick that I can’t trust the obd or my dash indicators. Gotta get in there and find the damn problem. This sht has my head spinning but I’m learning as I go. Y’all, pray for your neighborhood diy mechanic especially us ladies. God speed
The CHART reference in the video is not available without a MEMBERSHIP. Misleading.
Very useful information. Thanks!
Excellent video.
Thank you very much!
Bro looked like cousin Eddie from National Lampoon’s Christmas.
THANX
My '65 Corvair with 125,000 miles pulling a steady 20 at idle. 😀
Great video. I need to help my friend with his 67 327. Thanks
How can I help you?
@@ClassicCarRestorationClubthanks. Well my friends Chevelle isn't running as good as he would like. He has a holley 600 in the car and a 650 on standby . I'm waiting until we have the same days off which is almost impossible . I plan on checking his fuel pressure, idle, timing and vacuum. I think his problem also might be related to his electric fuel pump. I told him to go back to mechanical but apparently when the shop rebuilt this 327 they blocked off where the mech pump goes. I will definitely let you know how it goes. This is literally his car from high school.
@@thelagmeister just takeoff the delete plate and put the mechanical pump back on👍🏼
@@jessebaca2750 tried telling him that . He is still using his electric pump. He already sorted it out.
Sir, thank you.What does it mean when it middle is reading 12" of mecury?
Hello Efijemueh,
Here is a link to our website where you will find a list of common vacuum test results:
www.classiccarrestorationclub.com/video/engine-vacuum-troubleshooting/
Thanks!
Great video. When you check for that vacuum reading, is the car in PARK or in DRIVE with the foot on the brake? What should healthy readings be in both cases (in Park and in Drive w/brake depressed)? Thanks
Great question! The ‘Ask an Expert’ section is currently for members of our online community. By becoming a member, you will have access to our expert’s knowledge. With your membership you will also receive discounts on products and hundreds of hours of Premium content.
If you are interested in becoming a member, please click on the offer below:
go.classiccarrestorationclub.com/a19769 Thanks!
Park
@@Detryie Thanks,,, short and precise reply!
That chart you refer to sure would be handy. Where can I reference it?
Great question! The ‘Ask an Expert’ section is for members of our online community. I would be happy to send your question off to the experts. To get started, please provide the email associated with your paid membership. Thanks!
Hi,
Im in canada cant find a gauge like that.
Can you please tell me the make and where you got it?.
Great video
Thank you
The gauge used in this video is not some high-dollar tool but rather is available from harbor freight at a reasonable price making it a must have item in everyone's tool box.
Here's a link to the one we used: www.harborfreight.com/fuel-pump-and-vacuum-tester-62637.html
Wrench Safe,
Mark
just a quick question,would this test work on diesels or some deisels?
The easiest way to explain the difference between gasoline and diesel engines is with “air” and “fuel.” In a gasoline engine, airflow is everything. You’re throttling air. A diesel engine is the polar opposite. It works on the premise of throttling the amount of fuel being injected-the air simply follows suit. Therefore there is no need to throttle the incoming air. To that end, there is also no vacuum created within a diesel engine.
That being said some diesel engines are equipped with vacuum pumps to power accessories and other components but these vacuum tests in this video would have no bearing on the engines performance.
Hey now, I like this check way better than the starter fluid check!
Does this apply to a race engine with a race cam?
Cams with overlap will show a fluctuation in the gauge accordingly. There is some good info explaining this if you google overlap cam vacuum or possibly here on TH-cam.
Can I test engine compression with this gauge? Because I bought the same on harbor freight
Hello!
No, This is used to test engine vacuum, to check compression you'll need a compression tester.
If you have further questions, please reach out via classiccarrestorationclub.com/contact
What if the gauge has no reading ?
Great question! The ‘Ask an Expert’ section is currently for members of our online community. I would be happy to send your question off to the experts. To get started, please direct message me the email associated with your paid membership account. Thanks!
Thx , what gauge are you using ?
Hello,
This is a simple vacuum gauge like those available at most auto parts stores, I believe this one is from Harbor freight.
Mark
Classic Car Restoration Club
That’s the harbor freight one. It also works for fuel pressure. Worth every penny.
@@danieltrue1689 just bought mine about two hours ago worth every $14😃 The good old harbor freight midnight 🕛 special👍🏼
When I accelerate the gauge doesn't zero out.....it goes up to 25hg's and then comes back down to green really really slow!!! 🤔?
Hi Francisco,
As RPMs increase the timing advances, and the engine is not under load, it's not unusual to see readings as high as 25Hg.
If you quickly flip between WOT (Wide Open Throttle) and closed the vacuum should drop then read higher than normal before settling at a normal amount of vacuum.
Also Higher than normal vacuum readings can be a sign of an obstructed air filter, intake or exhaust system.
Mark
Classic Car Restoration Club
@@ClassicCarRestorationClub hi, yes thank you for the response. (When I flip the throttle open really quick it's doesn't drop to zero at all, it goes up to 25hg and then slowly comes down to the normal green zone 🤔
So, my 67 mustang will idle all day long. Purrs like a kitten. As soon as I put it in gear, it dies. No matter how long it's warmed up. Ideas?
Great question! The ‘Ask an Expert’ section is currently for members of our online community. I would be happy to send your question off to the experts. To get started, please send the email associated with your paid membership account. Thanks!
my 65 rambler is laughing right now..she does not want to stay running
What rmp
351 Cleveland forever 😎
@@jessebaca2750 definitely
Do all cars work with similar amount of vacuum or some of them work whit less vacuum?
Most cars work with the same range of vacuum.
The exception is those with very high-performance camshafts where the narrow lobe separation produces less engine vacuum.
@@ClassicCarRestorationClub Thank-you very much for your time, I appreciated. So turbo engines are similar too?
Sorry, I assumed we were referring to naturally aspirated engines.
Turbo or supercharged engines are a different animal as the power adders produce positive pressure in the intake system.
There are vacuum ports on some turbo/superchargers before the pumps but often these do not produce good vacuum until the engine has spun up.
@@ClassicCarRestorationClub Thank-you for your help, I appreciate it.
BRO, take that tiny little carburetor and throw it in the garbage where it belongs, choking hat golden rocket with that little baby
This is an ad. how sad.
Ql😯..
He refers to a web address in the video which doesn’t work. Need to go to... www.go.classiccarrestorationclub.com