Hello all,
Feel free to direct me in anyway if this has been discussed in another post. As far as I could tell I can not find anything in the Haynes manual about this so any help is appreciated. I am restoring a S5 RX7 from a bucket of bolts and am getting to the diaphragm as of lately. My situation is I am stuck at the thick line toward the back of the engine with 5 smaller lines running off of it (middle of the pic underneath the injector wires). If anyone has any insight or could provide pictures for routing of the 6 lines it would be greatly appreciated. My thought was it would run to the lower intake manifold but I have no molded line to reference. I wouldnt guess this is a fuel line because I have both the lines hooked up already and they weren’t in the manual. The only line I have seen to be this size involving air is the air pump and LIM

Anyways, if anyone has any advice or pictures it would be much appreciated,
Cheers

 

they go to the 4 oil injectors the 5th port should attach to the spider to meet the intake or to the primary injector air bleed ports but i can't recall which offhand atm(the S4 routed the primary air bleed port to a difference source but i semi recall the S5 simply tying to the oil metering nest). i can't find you any pictures of the curvature of the lines anymore though, the routing or placement of the lines doesn't matter a whole lot as long as they fit under the manifold without kinking.

the vacuum diagrams only show the vacuum controls and not the OMP system, so in essence the only port that isn't connected should go to this last 5th port. it's been a long while since i had one apart so i can't quite recall where the last one goes. someone has silicone hoses attached to your oil metering injectors, which is what is throwing you off.

i do wish they would have included these in the normal vacuum diagrams, but they didn't.

the thick hose is your BAC line, for your idle solenoid that crosses over to the other side of the intake. here is the best i could find to help you:

 

disregard the advertising, i found it on ebay as google and websites have purged most pictures over the years, including this site. for reference those white dots on the hoses should be pointing upwards, some lines are twisted out of place, so should help avoid some confusion.


here is another thread that may help as well:
The Authorative S5 N/A vacuum thread - RX7Club.com - Mazda RX7 Forum

 

and this port on the UIM is where the thick BAC hose connects to, i can't tell in the picture if the hose is upside down or someone put the wrong one it, it doesn't have the normal hose in place or has been cut/broken:

 

and these are your oil injectors where the smaller lines should be connected to, there is 4 of them right where those lines need to go:

images (259×194)


once you follow the color coded diagram on the other linked thread you should only have 1 port left in the area for that 5th line to follow to in the 1st picture i posted above. the only port not accounted for that i can recall is the air diffuser bleed port between the primary injectors.

 

the port in question with yellow zip tie here for port #2 on the nest:

 

Thank you for the responses, this clears it up a lot. I never saw that previous post and it looks very useful. I had purchased the oil injector vacuum line connector from atkins previously which is why I have silicon hoses on them already. I thought I had read somewhere that was needed but maybe its just for the rats nest delete. I appreciate the pics and links and Ill definitely be using that post for reference.

 

no problem

 

S5 manual is here https://foxed.ca/index.php?page=rx7manual
S5 is way different than the S4

 

i went through the whole manual, engine, lubrication and emissions to try and find a diagram of the OMP vacuum system but no luck. when i did work on them i knew from seeing the stock cars where everything went but it's been too long. i spent a good hour trying to find a diagram or reference picture in the S5 FSM but nada so i given my rough time with it i couldn't blame anyone for asking.

even simple reference pictures are getting unobtanium nowadays.