Valkyrie

There's a vacuum nipple that points toward the right side of the engine, under the extension intake manifold, right behind the Purge Control Valve...

For some reason mine has a short vacuum hose on it... but there's nowhere for it to go.

Any idea where it goes, what it does, or whether I should just cap it off or something?

Valkyrie

btw, it feeds into the solenoid rack on the left side... it's the other end I'm wondering about.

Carzy Driver

pics would help

Valkyrie

Circled in red... the Purge Control Valve is actually not on the car in the picture.

Valkyrie

I've also been wondering what the hell these two connect to...

Maybe I should just cap them off?

Valkyrie

Mkay, ANOTHER vacuum hose problem I'm having...

ALL of the diagrams of the solenoid rack seem to be really obscure or wrong...

I'm trying to find out just where the vacuum hoses with the check valves go on the rack...

The valves in question are the switching and relief solenoids... there simply isn't a nipple for one of the hoses, so what's the deal?


Also... never mind my second vacuum question... I figured it out.

Valkyrie

Well... I took off my intake manifolds and redid a few vacuum hoses... also hooked up my charcoal canister...

It basically idles like it used to, which is "bouncy, at 1500 rpms"

Strange thing is that I adjusted the TPS and it suddenly started and idled rock-solid at 2000 rpms, until I hit the throttle...then it went back to bouncing. wtf? My TPS is just a little off but not seriously off... maybe there's still a vacuum leak.

Now the only hose that isn't hooked up is the one that goes from the oil filler to the purge valve, and that doesn't even seem to have any vacuum on it most of the time.

I still get the popping though... I don't expect it would be due to the broken IAT since it should be running rich instead of lean.

And it seems to still pop even at full retard...

socalrx7racer

My best advice for you is (because you obviously can't read a vaccum diagram) remove the rats nest keep only what you need and run vaccum lines from wherever you want on the intake and plug it into whats neccesary, i think on my car i only have like 3 vaccum lines that i had to keep. also, about the fleeting idle, my cars been tuned by an all rotary performance shop and it still bounces, once it gets warmed up it goes away......kinda wierd but it is a rotary and thats what they do, i have like 4 friends with the same idle problem.

Valkyrie

I can read the diagram just fine... it's just that they don't show all the details or they're just plain wrong (which it was). That, or they're too vague to actually use to hook the system up.

I already figured out the vacuum hoses... I just think I still have a vacuum leak.

I still have some nasty sounds coming from my engine though. I can't drive it until I figure out what the sound is and fix it (and buy some other replacement parts that is...).

adrock3217

If I remember correctly, those had something to do with the ACV. I cap'd them off..

Valkyrie

I already figured them out... it's just that the diagram was a little vague.

Seeing as how I still have an ACV, I think I'll leave them how they're supposed to be

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/clanking-noise-engine-525277/ this is my current problem...