Gents,

Ok, after reading a few gauge threads, I've come to the conclusion that no one knows exactly where to tap it! Generally speaking, it makes sense to tap it after the throttle body, correct? Check out the pic below:



I believe this is the EVAP hose. Is that line ok to tap?

Also on a side note, see the oil residue coming off air cleaner hose? What the heck could be causing this? Too much Amsoil oil?

Bob

 

No idea on the oil resedue, but tapping the second pipe would give you vacume. You can just use a T since there is no flow needed for the gauge. I have my vacume/boost connector hooked into that same plug just after the throttle body.

 

Node,

Thanks for the confirmation. Much appreciated.

Bob

 

There is another smaller diameter tube that feeds the fue pressure regulator. On second thought, thats probably a better location for your gauge connection since its the same diameter as most vacume lines. Look just behind the intake manifold on the firewall side or follow the drivers side fuel rail till you get to the FPR and you will see the line.

Good luck

Jim

 

What if you were to use one of the little capped off vacuum fittings that are on top of the throttle body..., would'nt one of those work ?

Generally speaking Bob_98SR5, judging from what I've seen here, if you're getting residue that far from the source you either have a PVC problem, too much oil in your engine, or the Amsoil is working too good.

 

I know for a fact that at least one of those capped trottle body lines wont work since it feeds from before the butterfly. I hooked my line up there first and was like "WTF is my line leeking somwhere?" The other one may work though, so try it out.

Yea, that oil is strange. I would take the pipe off and look at the trottle body(see if its all gunked up). Arent the EGR and PCV hookups actually on the intake manifold, not the intake pipe?

 

Easy enough..., pull each cap off in turn, listening and/or feeling for suction/vacuum. When you get vacuum, you know you've got the right one.

Yes, but they then, in turn, feed back into the intake as part of the recirculation/recapture process to assist in maintaining overall system vacuum.

 

Bob...clean that engine up.

 

Jim,

Thanks for the alternate suggestion. I believe the ID of that vacuum tube coming off the fuel pressure regulator is much smaller in diameter. I'll confirm.

94x4 and Jim: thanks for the suggestions, I'm going to check out those things you guys mentioned.

David: yes, shes a little dirty, but all in good time

Bob

 

Just find any line about the right size that has constant vacuum on it. So avoid the ports right off the throttle body, they are often "switched" in that the throttle position turns them on and off. Avoid the big lines like the brake booster. Avoid lines after VSVs and other devices. Any other line should be fine, pick one that is easy to get to and give it a try. I hooked my 22RE gauge to a spare port on a 3-port fitting that feeds the cruise control servo and the fuel pressure regulator.