Look at picture first, is there supposed vacuum in those two hoses, if so, how much vacuum, when at idle? This is on a 1978 280Z

EDIT: I RTFM (again) and I think I am understanding that there is only vacuum in these lines under certain operating conditions, but probably not when cold and/or at idle.

So where else can I attach a vacuum meter on the 1978 280z to take some readings. I already attached to hose coming from Fueal Pressure regulator. but I wanted to check like 2other places, just to compare vacuum pressure.

Edited February 4, 201114 yr by argniest
Reading FSM

There's no need to check two other places, but if you feel inclined, you can pull that little looped line towards the back end of your intake manifold, just next to the larger brake booster vacuum line. That's where I hook in my gauge. That's the vacuum supply to your heater/ac controls, so the engine won't run incorrectly with that hose disconnected (as long as you have something else on the nipple, like your vacuum gauge).

no vacuum on EGR at idle as you discovered.

I hook up to either FPR vacuum line with a T, or the brake booster.

EDIT: hmmmm The little looped line??? Can you see it in the picture above? I want to make sure I use the correct one for testing.

Thanks for info. Im very glad to hear I can check it, at that other location, without effecting the running of the car. Because I feel when putting it inline with the FPR vacuum line with a "T" connector that it may be effecting the engine. And that is because any number of issues, of which I am testing and looking into all kinds of things inthe weeks ahead. One step bit by bit....I know I will figure out how to make it run better. With all my new Z friends, and mechanics...and studying FSM and EFI bible. Its only a matter of time.

The current consensus is that my fuel injectors are toast. But before I can or will, put in the new ones I have here, I will be investing the gas tank, then lucky me probably remove it, and either follow the POR 15 thread on this forum, to clean it, or have my relative clean it (he has done many before).

After seeing how much junk was in my fuel filter!!! I need to see what I got going on back in the fuel tank. I hope this weekend to find out after I pull out the fuel sending unit. If its horrible, bad, not so bad, easy to fix...etc

But I have a feeling after reading all kinds of posts on here, that its not going to be pretty. Especially considering the fuel filter clogged up bad.

Oh well, back on topic...I will look for that spot you mentioned and hook up my hose there. I want a second reading in a second place, just so I can see and learn!

This is all one big science experiment for the kid in me :-))))) And a very fun one to put it mildly!

Edited February 4, 201114 yr by argniest