let me start by saying that ive read like 75 articles saying that its my idle air controller, but i did some checking and that doesnt seem to be it. heres the scenerio:

ive got a 1995 integra with not much done to the motor, just new iridium plugs and 8mm wires. new distrubutor cap ect. oil changed often and i also have a huge header that is 4-1 with a 3" collector to a strait pipe that leads into a 2.25 exhaust.

anyway, my idle keeps rising and lowering by 100 - 500 rpm's and it idles so low if i dont have my throttle tight then it wont idle when warm. when i start it up and its cold it works great, idles dead on, soon as it heats up my idle drops and starts to bounce. i changed my idle air controller with one i had laying around (cleaned it out) but this didnt make a differnce. also, when i give it enough throttle i can unplug my IACV and it still does the same thing just lowers the idle. i checked all my vacuum lines, all seemed fine. also checked my PCV valve and thats fine. the only thing im wondering about is my FITV could this cause an eratic idle like im having? i checked the 2 holes on the inside on my throttle body, the IAVC hole draws alot of suction when warm, but the FITV hole still draws some vacuum at normal operating temeratures. should i be checking / replacing this next or should i be looking at something else?

when driving it seems to run fine but sometimes when i go to take off in first from a stop it will spudder a bit like its dieing, any ideas?

Any help would be greatly appreciated, none of the teg owners locally have had this problem. i asked my mechanic what i should look for and he didnt really know, so im not going to pay him $35 an hour to fiddle around if he has no ideas.

 

+1 Similar issue with my sis's 91' Integra. Hope someone can point us towards what else could be the problem.

 

same situation here with my GSR... my cousin had the same situation, before he sold his jdm gsr civic, well he ended up getting the car back, the guy that had bought it put in a skunk2 pro manifold, and new throttle body and it idles like a dream now, so who knows what causes it, anyone have an idea?

 

+2 same issue right here.

it only has that weird idle bump some times, but when mine warms up it stops.

 

i have no idea what it could be ive read in articles and come up with the following:

Pcv valve can effect your idle a little bit, but i dont see where it would make it jump.

IACV: makes sence to me, but when i unplug it and tighten the throttle so it will stay idleing, it still jumps.

FITV: this could very well be the problem, but would it cause the eratic idle that im getting? checked in the throttle body for suction in the FITV hole and i definetly have some suction.

Someone else mentioned checking the bolts holding your throttle body and your intake manifold, loose bolts could cause a vacuum leak.

Other thing i read was air in the coolant system, i cracked open my radiator cap and it was down about 200ml but my resevoir had lots in it for some reason?

Im just wondering what i should be looking for in my situation because id rather try to fix it myself then pay someone 40 dollars an hour to be as confused as i am.

hopefully if someone can help myself it may help other people in the same situation.

 

I found this article on another site for Acura Integras. It has a step-by-step on how to clean the IACV. Let's try it out. As soon as I have time I will do this on my sister's teg.

http://www.team-integra.net/se...=1174

 

I would say a bouncing idle would be caused by a FITV, but this normally occurs while warming up, not after. UNLESS your FITV/IACV are extremely mis-adjusted.. then maybe.
Also, do you have the normal coolant lines running to your intake manifold bits? your idle is controlled by temperature after all.

And check your grounds when you have low-rpm / starting issues, always.

And for the record i'd say that 3" pipe, a 4-1 header, and no cat are pretty extreme for such a small motor. I can see how a motor could act poorly in that situation, unless it was well tuned and built for the purpose. Your low end torque has got to suck.

 

yeah low end sucks, anyway im going to get my new cat to have flanges put on and sized to fit, im going to put the stock header back on (to see if that stops the problems) if that does it then ill just sell this one and buy one with a stock collector size. its a jdm gsr header and i wasnt sure how well it would work on the car. stock setup on all the lines to and from radiator and FITV i find it weird that i can plug the fitv hole in the intake manifold and it doesnt fix it, i can also unplug the IACV and it doesnt fix it either. ill let you know what it is if i find out tommorrow.

By the way i never put the whole story, when i put the header on we took it down to the car wash and my buddy washed off my motor and my header because i got some crap on it, and it hasnt worked well since the combination of engine washing / header instalitation.

It worked great before i did these 2 things.

 

hmmmmm... did he cover the distributor when he washed the car?
dumb question, but getting water / chemicals inside the ignition system screws things up all the time.
Odd that it is not your fitv/iacv. usually vacuum causes this stuff..

I think a cat will give you the low end resistance you need. try that first. Besides, it's environmentally responsible ya know ;]
I hate losing low end torque, which is why i haven't done intake and exhaust on any of my cars for a while.. ( except my old cavalier 2.2.. which had plenty of torque to begin with )

 

no the distriduter was not covered, but i had taken the cap apart since then and no water or chemicals.

Ive sortof eliminated the IACV because i repleced it with another and made no differnce, and i can unplug it and it still jumps in idle.

Monday were stripping the FITV off and cleaning / adjusting it.

Put the stock header back on with the stock cat converter and it made no differnce in my idle. Did seem like i actuly lost some torque by putting it back on..... maybe the cat is clogged up?

 

so far we know it is not:

IACV cleaned, replaced, cleaned and replaced again, no dice, can unplug and no differnt.

FITV: cleaned it so good i thought i was putting a new one on, but ofcourse, it didnt fix it.

Checked all of the vacuum lines, no holes or cracks.

doesnt seem like a vacuum leak because i can cover the throttle body with my hand and kill the motor.

its not the header i had on, put the stock one back on.

Its not my distributer cap, checked that and its great

Tommorrow we flush and fill the radiator.

 

what a mystery.
Well, i unplugged my iacv out of curiosity in the del sol and the idle went nuts, but not like a misaligned fitv.. i think it went extremely high.

dunno if this was mentioned, but is your fitv properly adjusted? you adjust it by the amount that you screw it in.. just an idea. You're supposed to screw it in about half way.

 

skrewed it in the whole way, its only a little farther then the one i took off, i still get vacuum through my fitv hole in the throttle body, wether this is caused by a misalligned FITV or a rotten radiator fluid. as far as i know the rad fluid is like 4 years old so im getting it all flushed tommorrow will let you know how it turns out.

 

well i got the rad flushed and it made the car sound better, but ofcourse it would not fix the idle problem. im to the point where i dont know what it is. i have noticed that the car is running VERY RICH........ could this have anything to do with it? what would cause it to be rich, improperly adjusted valves? valves need to be seated? O2 sensor?

im to the point where i need suggestions and whoever can figure out what it is ill paypal them 10 dollars just for helping me out.

i can take a video of what it is doing if needed.

 

jeez.. i'd take it to a shop at this point.
sounds like you have a lot of probs..

 

I had a similar issue and when i cleaned the IACV it went away.

 

ive been to a shop owned by a good friend of mine, we cant figure it out, and im trying to stay away from taking it to a dealership, id like to keep both my legs, ill have to take it to my local honda guru see what he can figure out.

 

like i said earlyer, if i hold the throttle on enough, i can unplug is iacv without it stalling, and it still jumps in idle. ive got another one laying around im going to put on and try.

 

could be your timing..but im not sure.

 

so im still having problems, but i figured out when i rev it up and let off the gas, it never comes to the same idle point, sometimes it will go to 500 and them back up to 800 and jump, sometimes it will stop at 1400 and jump up and down any ideas? the throttle cable itself comes to the same tension but idle fluctuates.

 

jeezz...
have you ran some carb cleaner through your intake manifold and TB?
maybe something is plugged up?

 

i will give u a cheat on how to get rid of da idle.inside da throttle body has a hole in there.plug that hole up with duck tape or electric tape and ur car will run like a champ.good luck.these idle reving alway's happn' on acura integra'z all day long.i been through a whole lot.

 

i have a 94 integra with the same problem, i have no idea what causes it...

 

I hope people are still checking this thread, i have a similar situation that may get someones wheels turning in a new direction. I just bought a 1995 Integra RS, the guy built it as a type R look alike, and had a Boosted B18b bottom end with a Type R head and GSR wiring Harness. He kept the head and i put the stock LS head back on it making it a stock B18b( I know you're all wondering why, i did it to bring the price of the car down) but not only do i have a ton of left over unused sensors on the harness, but i have a peculiar Idle issue. There are two plugs on the harness side by side that look like they go onto the back of the throttle body, but there is only one slot. they're the same size, but the wires are diferent colors so i looked up which one should plug up. when i plug the "correct" one into the back of the throttle body my idle bounces between 1k and 2k rpm approx. 2 times per second repeatedly like a metronome, but if i plug in the other harnes with the "Wrong" colored wires, my idle quickly climbs to 5k rpm and stays there until i unplug the harness or shut the car off. i've replaced EVERY removable piece of the throttle body with new and nothing has changed... I've remapped the ECU and even pulled off the charge pipe and plugged in a stock ECU and nothing has changed...