Vacuum gauge hook up

Sorry to ask a question I am sure has been answered before, but the search function is down. Is it OK just to unplug the PCV line & use that as a.
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That was better than last year before the rebuild when I was getting inches.


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I still wasn't totally happy with that though. I pulled my intake manifold back off to check for water leaks, and reseal it.


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    6. I am putting it back on a little different this time Just wanted your thoughts on a healthy vacuum reading range. That's what I figured. Also not sure what's up with the two holes but I'm sure it will be fine. I stopped by ACE on the way to work and got a brass fitting that works. Anybody have a resource on vacuum testing procedures? What the readings tell you etc.? I found some stuff on the web but I'm sure the folks here are much more knowledgeable. I tested last night in the driveway. I got a pretty steady reading of Everything sounded great and the carb responded good.

    Did not make it to the lake for a load test but will do tonight. How would you condider the reading of 16 at rpm? Just hook that pup up and turn the motor on at least thats what I do.

    Where to hook up vacuum gauge?

    In fact, I have my gauge hooked up permanently in my truck. I think its the best way to tell what your engine is actually doing. You can start to adjust your idle mixture screws, timing, etc, to see what it does to the readings. I like to have the idle set around rpm or so to get a solid reading.

    How Engine Vacuum Works

    If you rev the motor up, the readings will go up. I am interested in seeing what types of readings Eric likes to see, and what rpm range. He knows A LOT more than the internet!! In fact, I think he invented the internet. No wait, that was Al Gore. Alan, I see that in your pic you just have a cap on the brass fitting. Can you run like that? Do you leave that fitting in there all the time?

    Davidg, Do you leave your fitting in or do you plan to? Check this link out guys. A good overview on vacuum readings.

    How to Install a Car Vacuum Gauge | It Still Runs

    Vacuum gauge hook up. Start Prev 1 Next End. I have a 94 gmc truck with a TBI Where do I hook up the vacuum gauge to get the best readings. Will the Vacuum booster be good enuff? I would say tee off any vacuum line close to intake manifold. Vacuum booster would work.

    May i ask why your pulling a gauge for vacuum? Curious of your numbers you get. You can tie into any manifold vacuum point and the brake booster is certainly one of them. I generally use a smaller line though; maybe something tied in with the EGR or whatever. My hat is off to you for using a vacuum gauge. They're cheap, easy to use, and one of the handiest tools around.

    Matter of fact, anytime I'm working on a car with a performance problem I hook the vacuum gauge up first thing to see what's going on.

    Claim Yours Now

    It takes seconds and tells you instantly if you should be worried or not. One of my modified cars here with a homemade instrument cluster has got a vacuum gauge mounted in it as part of the cluster. There are some great kits for the purpose for sale online. There are cheaper ones and there are also more expensive ones - just about any will do though. As a bonus, it can also be used to measure exhaust back pressure if the gauge also measures positive pressure - but we'll talk about that another time.

    To test the engine, start it and let it reach full operating temperature. Then simply connect your vacuum gauge to an empty vacuum port on the intake manifold anywhere PAST the throttle body. That reading should be between 17 and 22 inches of Mg mercury.

    Check Your Engine’s Health: With a Vacuum Gauge

    A high, steady vacuum reading is the sign of a healthy engine. If you're at altitude, these readings may be lower supposedly by 1 inch of mercury for each ft above sea level, roughly. A low vacuum reading means you have poor piston rings or oil rings. You may also note lower vacuum readings when running high overlap camshafts or changed camshaft timing.

    If the engine passes that test then snap the throttle open and closed again. Doing this quickly should reveal a vacuum drop to perhaps or so and then it should snap back to 25 before settling back to again. This means the valves and rings are OK. Snapping the throttle and getting a drop to 0 and then a climb to only say will possibly indicate worn rings.

    Basically, if it only snaps to about where it was or just a hair above, you may be dealing with worn piston rings. A sticky valve can be spotted by seeing a vacuum reading that occasionally drops from normal by about 4 inches of mercury.