I was just wondering if anyone knew what the correct way was to reroute the vaccuum lines after removing the ACV, 5th 6th port actuators and smog pump.

What I did was cap off all lines that were not being used anymore and removed the check valve that goes from the end of the rats nest to the hardline right in front of the oil filler neck.

Seems to be running fine, but I thought I'de ask to see if I missed something.

By the way, this is on an S5 NA 6 port motor.

 

why on earth would you disable your 5&6 port?



https://www.rx7club.com/2nd-generation-specific-1986-1992-17/s4-s5-na-vacuum-lines-735982/

 

I know I know but my ports were gunked up and stuck open anyway. Thanks for the diagram, I've seen this one around the forumn, but it's not very clear about those lines that go through the hard lines and wrap around the motor.

The one in particular that I'm a little unsure of is the one that has that little green and white check valve in line coming off of the rats nest and connecting up to the hard line behind the oil filler neck. I removed that check valve.

Here's a pic I found for reference.

 

that might be the check valve for the double throttle

 

No, that's another one that sits right under the TB. That's still there.

 

The check valve is shown in the FSM and also the diagram in one of the posts above. For some reason they put a check valve b/t the source of vacuum and the switching solenoid. Flow should be in the direction of the arrow.

The vacuum comes from a vac line going to the dynamic chamber but the pic does not define which line and does not show where the *green* vacuum line gets connected to the feed line coming off the dynamic chamber.

Both the switching and relief solenoids that the check valve is in line with have control of the ACV and you removed the ACV.............sooooooo..........remove the checkvalve and block off or remove the line that feeds those two solenoids from the dynamich chamber. Just follow the hard line from the checkvalve back to the dynamic chamber and cap off at the dynamic chamber is what I'd suggest.

I don't think that checkvalve exists on a series four. Not sure why it exists at all. Makes little sense. EDIT: Wrong. It exists on the series four also, just looked.

 

Thanks Hailers2!! This is really good info and makes a lot of sense.

I knew that I had missed something. Right now I just have a vac line with no check valve in there and it just didn't seem right to me.

I'll take the vac line out and block off both ends with a vac nipple and that should solve the problem.

Thanks again.......

 

Update!!

So I went ahead and followed HAILERS advice and removed all the vaccum lines from the "Relief" and "Switching" solenoids and capped off all the unused areas with vaccum nipples.

Results, No more hissing coming from the rats nest and a smoother and more consistent idle. I also noticed better throttle response, but that could just be my imagination.

So, in conclusion, If you're removing your ACV, Smog pump and 5th and 6th port actuators, remember to cap off all the unused vaccum lines, and also remove all vaccum lines from the Relief and Switching solenoids and cap off all the unused areas leftover.

Thanks Again Fellas!!