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Old 06-26-2008, 10:34 PM
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Idle Problems

hey all if you could answer these question would be highly appreciated

98 prelude SH cold air intake 150000km h22a

so when i come to an idle when its hot i start droping 500ish rpm and it makes this wierd sound then rises drops rises drops rises ect....

and my idle seems to be really unstable when its not doing this burbing thing it goes from 1500 to 800 to 1100. just randomly, not surgeing in that range. drive come to a stop 1500 steady drive then stop again and its 800, then 1000 then 800 then 1500......

it will never rise then drop always drop then rise........

how can you adjust you idle i've heard you can't, the computer does it but i once had a mechanic turn it up so there must be some way.......

would it be a good idea to reset the computer (unplug the battery right?)

or i heard removeing the egr valve can help or cleaning it? can some one tell me how to do this or give a link?

someone said to
"try cleaning out the throttle bore and the idle speed controller with carb cleaner and a rag. That should help stabilize the idle"
can anyone tell me how to do this or the best way/ best product to use

and

"problem is the IACV valve, and it must be taken off the car and you must spin the valve shut"
again can anyone tell me how to do that.....

i know this is kinda alot to ask and i am some what mechanically inclined but the 5 gen prelude im new too.......

would really appreciate some help, advice, or atlest point me in the right direction..........
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Old 06-27-2008, 10:31 AM
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Clean the IAC valve...I think that may help...I did just today because I am getting MisFire codes/MIL and now my car idles so much more smooth and leaves in 1sr gear like butter now...but I am still getting my EVIL MisFire codes!!! I am sad but think the IAC valve might help you!!!

With the IAC valve...take it off and clean the screen, I am not sure of "spin the valve ****", I took it off and cleaned the screen, then reinstalled and felt SO much better...I don't know how to "shut" it...I had no problem after reinstalling...BEWARE the little rubber gasket on the IAC itself was expanded and didn't fit...so I had to cut it and use some instant-gasket until I can go to Honda today and order another rubber gasket

Hope this might help

Last edited by 929on9; 06-27-2008 at 10:35 AM.
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Old 06-27-2008, 10:09 PM
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where is the IAC valve located on the 98 prelude is there a write up?
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Old 06-27-2008, 10:17 PM
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yeah go to the 5th gen forum or general tech talk look at the resource threads
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Old 06-29-2008, 12:36 AM
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Idle

Problems myself..whenever i come to a shift to neutral to stop if the rpms are above thousand it likes to ramp..only 500 rpms though..my problem is a vacuum leak apparently by what the mech said when he heard it.
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Old 06-29-2008, 12:39 AM
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Clean the IAC prob the problem.. you can clean it with carb/throttle body cleaner.. as far as spinning it its not gonna happen and if you do youll kill the IAC because most likely youll screw up that motor in the IAC in the process.

There is a fast idle thermo valve under the TB that you can spin down, mine was out of wack and it was pretty easy, take it off, open it up and take a flat head.

DONT take that EGR off, that is my ranting pet peeve at the moment. If youre throwing a code for it and cant clean it and you cant afford to replace it... maybe take it off for a temporary thing. The EGR's sole purpose is to lower an emissions called NOX, oxides of nitrogen and they are super bad for the environment but are only formed at cylinder temperatures above 1500F so the EGR recirculates exhaust gas back into the intake because its a hell of a lot cooler than 1500F. Aside from that it raises your compression ratio because now you have an inert gas in your cylinder, so it takes up some space meaning the actual fuel gets compressed even more making a bigger bang for your buck, so the EGR actually gives you power and lowers the cylinder temperatures and helps emissions!
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Old 06-29-2008, 01:06 AM
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Is there a picture setup somewhere on this cleaning process...i do good with pictures..not so good on just reading without visuals, because i don't wanna screw something up. big chicken to screwing things up..
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Old 06-29-2008, 03:47 AM
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Quote:
Originally Posted by NightRacer View Post
Is there a picture setup somewhere on this cleaning process...i do good with pictures..not so good on just reading without visuals, because i don't wanna screw something up. big chicken to screwing things up..
go to the resource guide. it has a step by step on how to do it. but here you go man

http://preludezone.com/showthread.ph...ht=bouncy+idle
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Last edited by 94ludeguy; 06-29-2008 at 04:00 AM.
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Old 06-29-2008, 06:59 PM
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just spray it with carb cleaner shake it around some.. haha. and adjustment of the iac is here but be freakin careful http://92lude.com/idle_air_control_bypass_mod.htm you could screw up the motor
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Old 06-29-2008, 11:25 PM
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per the chilton repair manual...

and I quote:
page 2-8, "The Powertrain Control Module (PCM) idle memory must be reset after reconnecting the batteru. Start the engine and hold it at 3000 rpm until the cooling fan comes on. Then allow the engine to idle for about five minutes with all accessories OFF and with the transmission in Park or Neutral."

This is in the section for reinstallation of the distributor, which I did when I changed the o-ring seal on my 97 base about 2 months ago. Before I did this, my idle was always erratic, similar to what you stated your situation was. I've only had my car for 8 months or so, and I assumed it was just normal since the car has 86K miles on it. After performing this procedure the idle is smooth and consistent, especially when the A/C is cycling on and off. So you may want to give it a try.

Good luck...
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Old 06-30-2008, 05:13 AM
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SFIELDS....please tell what your talking about in regards to the ERG, I did not understand your post about...your pet peeve about not taking the EGR off, I was going to remove and clean just for good measure BUT I don't want to remove if it will mess things up...please elaborate on this
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Old 06-30-2008, 05:20 AM
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OMG i just saw the pics from SFIELDS link to take apart the IAC valve...I would not and did not take it completely apart, seems like parts will break and will make car "garaged" til the replacement parts come...I just removed, cleaned the screen, and reinstalled. also I broke the rubber gasket that goes between the cover and IAC itself...BUT after cleaning that screen, installing with some liquid gasket and making sure of no leaks...my car runs at low RPM like butter...now if I could just get the misfire codes to stop occurring.

Just my opinion and what I did, with the outcome making my car run much better...to be honest when my IAC was out...I didnt think it came apart, LOL...anyways I may have taken it apart IF I had known it would.
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Old 06-30-2008, 11:26 AM
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This bouncing idle problem is the Fast idle valve. EVERY time someone asks about this people say the IACV but the only thing that affects is if you hit the brakes really hard or turn the steering wheel, the idle will jump up because its not cleaned out. So its a good idea to clean your IACV but it doesnt fix it. Heres a thread on how to fix your Fast idle valve- http://www.honda-tech.com/zerothread/1003988
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Also, as a side note, after reading a bit up on vtec, h22, and h23, (and also taking the car out for a bit of a *AHEM* sporty drive) I humbly request admittance to the bandwagon.
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"WtF, wHeRe'S mY JdM VeeEEE-TaKKKKK????"
and the ecu will be like.... "NOPE!! no veetak for jew!! jew can't handle da more agressive cam lobes!!! omgzorz"
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Old 06-30-2008, 11:28 AM
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Quote:
Originally Posted by 98preludeguy View Post

"problem is the IACV valve, and it must be taken off the car and you must spin the valve shut"
again can anyone tell me how to do that.....
That is not the IACV that you "spin" shut, its the FITV, fast idle thermo valve
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Originally Posted by Antaeus View Post
Also, as a side note, after reading a bit up on vtec, h22, and h23, (and also taking the car out for a bit of a *AHEM* sporty drive) I humbly request admittance to the bandwagon.
Quote:
Originally Posted by twokexlv6coupe View Post
"WtF, wHeRe'S mY JdM VeeEEE-TaKKKKK????"
and the ecu will be like.... "NOPE!! no veetak for jew!! jew can't handle da more agressive cam lobes!!! omgzorz"
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