I finally got my idle down to steady 800. As it turns out, my fast idle was way out of adjustment and my primary throttle valve wasn't closing all the way. So I'm pretty excited about that, but now I found another small problem: if I turn the AC on during idle, it goes up to 1100. I'm sure this has something to do with either the ASV or the BACV, and I tried to follow the checking procedures from the FSM but I got confused. Would someone be able to let me know how to fix this? One thing I did notice is that when I disconnect the vent and vacuum solenoid connector, the engine speed does NOT change (and according to the FSM, it should decrease).

Thanks!

 

Check out Fuel and Emmisions 13B page 53, shows you how to adjust your ASV. http://www.wankel.net/~krwright/cars/rx7/85_manual.html

 

I did, but that's what I meant it's not too clear. I mean it says, 'disconnect the vent and vacuum solenoid conector, the idle speed should decrease'. Ok... it didn't decrease, now what? The other thing is, it always says 'make sure that the idle speed does not DROP when AC is turned on'... mine doesnt drop, it goes up... the manual doesn't address this scenario.

Also, I just came back from the emissions testing center. Before I got the idle down, when it used to be about 1200 rmps, my HC level was about 1300 ppm (limit 220). I got my idle down to steady 600 (figured lower than 800 might help for emissions) and the new HC level was freaking 2300 ppm!! Doesn't make any ****** sense!
<deep breath>
ok... I'm calm now.

By the way, the emissions test here is only the idle test. The way they do it is, they run it once, then they ask me to rev it up to 2500 for about 10 seconds, then back to regular idle speed for a second run.

 

...anybody?

 

when the AC is turned on the rpms are supposed to go up to 1100. There is a solenoid in the rats nest whose sole function in life is to create that effect.

 

Oh really?? I thought that the ASV was supposed to make sure the idle speed remained at 800 under all circumstances. I'll be damned.

 

Well you learn something new everyday. The purpose of raising the idle when the AC goes on is to help the engine handle the additional load created when the compressor is running.

 

Does that solenoid act only on the AC system? I'm getting my idle fluctating between 900 and 700 RPM and I'm wondering if something else could be causing that solenoid to kick in and raise the idle? It seems to stay at 700 most of the time but every once and a while will kick up 900 for a reason I can't yet determine.

Sorry to hijack but I figured the other issue has been dealt with effectively.

 

It is my understanding that the ac solenoid bumps the throttle to maintain 800rpms, otherwise it would drop.
On my GS, its the white solenoid, and the vac it controls leads to #2 in the pic.
There is a screw in the center of it for adjustment.

 

Hmm, no. Straight from the FSM, throtle opener is supposed to bump the rpm to 1200 when AC is on. Well that is for a 12A.