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vacuum gauge connection
Posted 30 September 2010 - 06:32 PM
As close to the center of the intake manifold as possible. On the EJ engines, that usually means a connection just to the front of the throttle body. Be sure to use a "T" so that whatever was connected there still gets vacuum while the gauge is connected.
question where can I connect a gauge up to check?
Posted 03 October 2010 - 06:35 AM
Posted 06 October 2010 - 11:39 AM
Maybe I used the wrong location?
Posted 06 October 2010 - 11:50 AM
You obviously first connected to a source of ported vacuum. What you want is a connection on the intake manifold, to the front of the TB.
I just came from outside.. my hose is a little too big in the I/D but I took the hose off on the L shaped vacuum hose just after the T/B and I got no reading until I revved the engine.. if I did the hose where the FPR was I got a good reading.
Maybe I used the wrong location?
Posted 06 October 2010 - 12:40 PM
From my understanding it should be as close and to the center as possible but haynes just shows it connected to the intake port for cyl #3
Posted 06 October 2010 - 01:25 PM
Posted 06 October 2010 - 01:39 PM
Posted 06 October 2010 - 02:09 PM
There's the PCV, too.
here you go the only lines I see is were the brake booster and the FPR
Looks like you'll have to "T" into the FPR vacuum line, since I doubt you'd want to drill and tap the manifold.
Posted 06 October 2010 - 02:29 PM
Posted 06 October 2010 - 07:15 PM
I thought we were discussing the connection of a vacuum gauge. If there's more that this is related to, you'll need to be specific.
Looks like I should do the spark plug test instead? The pvc should work too right? I think mine is due for a replacement soon
Posted 06 October 2010 - 07:29 PM
Posted 06 October 2010 - 08:28 PM
As we've discussed, the best place to measure vacuum is at a central location on the intake manifold. Sometimes that isn't a choice. Since the FPR needs to know how "all cylinders" are doing, even if the point isn't ideal, it's adequate for your needs.
The main difference the vacuum take-off point on the intake manifold will make in the measurement is that a central point tends to average it better -- that is, there's less pulsation. If you see more needle vibration than you'd like, you can dampen the movement by restricting the flow. That can be done with an orifice in the gauge's vacuum line, or something as simple as pinching the hose. Just be sure the needle movement isn't indicating an actual problem before you damp it out.
Posted 06 October 2010 - 08:49 PM
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