Stupid Idle Surge

[A//// Guy]

Like I already told you Im pretty sure its your FIAV. Try and find another TB and swap it out. Cleaning your original one would only help if the valves are really plugged. But that ussually doesnt cause surge.

[Halon]

What if I did this then?

http://www.vallotton.com/fiavblockoff.asp

By doing this, I would be basically taking the whole FIAV out of the system because I'd be blocking it off. So that would make me assume that if mine was really causing this problem, then doing this block of thing, it should get rid of the idle surge. Am I correct in assuming this? If so, then I think this is what I will be doing a lil later on. Thanx again everyone.

[A//// Guy]

I guess if you live in Arizona that mod is fine but when it gets cold I think that some people have problems starting the car. Is the idle surge constant or does it go away after the car is warmed up?

[Halon]

The problem is constant. Surge is there all day, every day. I think I'm going to try this block-off here shortly. It's not that cold here. I will be in MN in about a month. And if it starts causing problems, then I'll look into getting another throttle body. But for now I think ill do the block off, that way I atleast will know if this is what's causing the idle surge.

[Halon]

just pulled the TB off. By just looking at it, it seems that the throttle plate is not closing fully. Its like that little idle screw switch thing that the singe green wire plugs into is causing this. Like it's too tight or something. It being too tight is not letting the plate close all the way because its hitting the switch too soon so its not fully closing. Does that make sense at all? Anyway, the plate is a lil dirty too so I'm gunna go ahead and clean it, and then back out that idle position switch or whatever its called so the plate can close fully. I really do hope this is the end of my idle surge problems. I got my fingers crossed!

[Halon]

I just put everything back together. I haven't started the car up yet, but I will in a little bit. It's too damn hot out. I'm working in like 20 minute intervals right now. I think its only like 95 out, but i'm workin right under the sun, the blacktop is hot as hell, and all the engine parts are getting hot from the sun. Plus the fact that I'm scared to start it up cuz I just know the surge is gunna still be there cuz I'm not that lucky.

[Halon]

also one other quick question. the female connector in the engine bay with the pin you need to ground. Is this supposed to be plugged into something normally or does it just sit there unplugged always? Mine doesn't have the little cap on it that VFAQ talks about, its just a plug with one wire going into it taped to a bigger wire bundle.

[Halon]

ok, so i got the throttle plate set right. Installed it, grounded the engine bay and interior leads and started her up and got ready to adjust the BISS. Well I start her up, and of course like i dreaded, the damn thing started surging. Now I found out that if I unground the interior lead and leave the engine bay one hooked up, then i have no surge at all. But it idles around like 1200. Doing this I also think that my BISS is leaking. When I put my finger on the top, I can feel it sucking air. So I'm going to have to find a new oring for that i suppose. OK so if i have only the engine bay lead grounded, I have no surge. Now if i unhook it and leave neither of the leads grounded, it surges. If I have only the interior one grounded, it surges. If I have both grounded, it surges. But if I have only the engine bay one grounded, i get no surge. Does that maybe explain anything? I dunno, I'm gunna get a new o-ring for it someday. Also I'm gunna see if my buddy with a 92 awd laser will let me throw his TB on my car someday. It's freaking hot outside, I am done working on it until the sun starts setting. And I'm trying to find a sumone with a stupid digital camera so i can take pics of all my new powdercoated stuff.

[Kracka]

Originally posted by me612@Apr 23 2004, 01:22 PM
-BISS (not sure how to check this)
-FIAV (how do i check? can i just do the blockoff like vfaq and by doing this would that eliminate it as the being the culprit?)
-Throttle Plate (I'm going to clean it right now, anything else I can do to check this?)
BISS: put your thumb over the BISS screw hole and see if anything changes...or put a few drops of water on top of the screw to see if it bubbles at all.

FIAV: blocking it off will eliminate it

[JasonR]

Sounds like your adjusting the biss correctly. The FIAV needs to be replaced with a new one. Where do you live. I am south of the cities. I can stop by tommorrow or sunday and help. Plus I can make a photo copy of notes I have off of old vfaq which is really good and explains everything so you have for reference. I wished it was just adjustment of biss for you, it will take a little longer for ya. Reason you have no surge when ignition grounded is because ECU does not have control of ISC, it cannot fiddle with. I am starting to think your valve is locked on FIAV.