IACV clean / check !

For those who dont have a clue what Scorpio is on about...the IACV = Idle Air Control Valve - which controls your idle , in relation to the brake booster and coolant flow etc.

Disclaimer: The following is provided as a GUIDE ONLY, and neither myself nor Ozhonda take any responsibility for the outcomes of someone else doing the following. You follow these steps at your own risk!

Aim: Basically , on a older engine (D series or B series ) you may develop a slightly chugging idle for no apparent reason...AND if u press the brake the idle drops further ??? BEFORE you replace that engine , try cleaning ur IACV first !

Required: 1 x 12mm wrench , 1 x can of Carb/brake cleaner , 1 x phillipshead screwdriver and a old rag to absorb coolant leakage.

Steps:

Locate your IACV , which on D series engines its mounted on the rear of the intake manifold near the throttle body, and on F series engines its mounted towards the front of the car on the intake manifold near the throttle body.
http://tech.ozhonda.com/diy/ICAV_clean/1.JPG


Next , make sure your engine is off ofcourse , and then disconnect your Negative terminal upon your battery.
http://tech.ozhonda.com/diy/ICAV_clean/2.JPG


To remove it, all you need to do is take the 2 12mm bolts out, disconnect the electrical connection/s (simple plugs), and 2 heater lines that run to it. (note put a rag on the heater lines so it doesnt spill everywhere)
http://tech.ozhonda.com/diy/ICAV_clean/3.JPG
http://tech.ozhonda.com/diy/ICAV_clean/4.JPG


Next , take some brake cleaner or carb cleaner and spray out the screen, which as you can see is very clogged on my lil ZC :)
http://tech.ozhonda.com/diy/ICAV_clean/5.JPG

NOTE you can also take off the bottom part ( 3 phillips head screws) and inspect the gasket to make sure its clean and dirt free..and to check the small rubber grommet inside
http://tech.ozhonda.com/diy/ICAV_clean/6.JPG

After spraying a nice amount onto the screen...give a few hours or so to let dry - Then put back together and re-attach in the exact same method !
http://tech.ozhonda.com/diy/ICAV_clean/7.JPG

Idle problems may be gone!

Umm...only really beneficial to Older engines or more thrashed stallions remember....just to clense those clogged holes ;)

nice DIY
i wish i got time to take pics and post some DIY job i did :)

any idea where it is on the b series

Good idea to get ethier a air compressor or dust off (from computer shops) to clean it right out after using the carb cleaner and also to dry it off...

Spray the cleaner for around 3-5 mins then air out for 3-5 mins do again and leave for around 2 hours to dry off then reinstall.

Quote:

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Originally Posted by stanleym

any idea where it is on the b series

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It's on the back side of the manifold right by the throttle body. Basicly in the same place as this one was. Same cleaning procedure too.

hmm aiight i dun think i wanna go playinwif it until i kno the eact location haha

cheers thoguh

sounds like something to do over the weekend. you can help me out stanely

good writeup, very clear

bought a can of TB cleaner couple of weeks ago to clean my TB, might as well clean the IACV whilst im at it. been having some idling probz lately, seem's like a worthwhile DIY. hope it'll fix it.

great write up btw:thumbsup:

found my IACV on the under side of the plenum near the throttle body... absolute bitch to get to... d16y4 BTW...

Ben any chance of a pic of the location of the unit before you removed it? Might help us less literate ones out ;)

Quote:

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Originally Posted by Limbo

Ben any chance of a pic of the location of the unit before you removed it? Might help us less literate ones out ;)

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illiterate you guys maybe , but there is an obvious picture right at the begining lol :)
Here it is again , for D series - same application for B series etc. Look around !
http://tech.ozhonda.com/diy/ICAV_clean/1.JPG

just finishshed doin it

those heater lines are a b!tch to get off haha cut my hands up good

aint tested the car yet but will soonish

Thanks Ben some of us dumbos need the thing pointed out. I'm off to do mine soooonnnnn

Guys,

D16 EG5...

I cleaned the IACV out with no change. When she starts she still varies between 1 and 3k then settles at 2k - still a bit high no??

Has anyone had to replace an IACV? Any other areas I can check to get her normal again??

J

What did your engine usually idle at? Does the idle jump up and down between 1 & 3? Does the idle settle at 2 when engine is cold...or does it have to be hot? My idle speed control screw was clogged with crap behind it...so turning this had no affect at all on idle before it was cleaned so this may be a problem with yours. You may have to physically poke a scribe around there because I don't think the carby cleaner will reach there.

I assume you've also read the forum articles about the FITV because this affects idle as well.

just a little addition to the thread. The threaded section above those ports can unscrew itself. If you still have an idle problem look in the top of the unit and see if you can scew it down again. This is particularly common on the EW series motors - yes they are still out there.

Also, the pipes for the heater hoses at the bottom can corrode out. Before throwing the unit out, you can 'JB metal weld ' glue new pipes back into this part. Done that to two IACA's so far. Just flat off the corroded part, drill it out - carefully- slightly oversize for the replacement pipe, and glue it in. I get replacement pipes from an old magna carby.

i tried to take off my IACV... it wont come off !!!

i used a wrench and its like the screws are stuck on...
i broke a socket set trying to do it...

tried some good ol'e trusty WD40 and it failed me...

i was told 2 try and use a pole on the end of the wrench... i just dont have a pole...

anyone else had any trouble???

if u can get a breaker bar and the small socket onto it , leverage helps ALOT.
Just take your time , hold one end with your hand and slowly "hit" the other ( the RIGHT way to undo) and hopefully it will crack it

i hope so...

breaker bar? hmmmzzz... cant i just use any pole??/

best to use a long ratchet , or breaker bar as stated.
But a normal spanner will fit , just be careful it doesn't slip and round the bolt end , and make sure you are loosening the RIGHT way ! ( you should turn it towards the RIGHT hand side of the engine bay to undo)

wat can be done if u round the bolt (no that i have tho)

hammer and chisle as your going to replace the bolt anyway

turtleEK1 or anyone else who has done this on an D16Y4 - what did you do? I took mine off (I have D16Y4) and it seems to be of a different design to the one pictured in the DIY. As turtleEK1 mentioned it's located underneath the throttle body. I right royal pain in the behind to get on and off without removing the throttle body. My breather hoses seem to be stuck on as well. I ended up putting it all back as I couldn't seem to find any 'mesh' that needed to be cleaned. I also checked out the service manual but from the schematic it doesn't appear to have the 'mesh' filter. Any help appreciated.

im gona leave it... ill get ppl from honda 2 do it for me...
it needs a major service anywaz...

just a note if u still have a high idle it will pay off to take the whole throttle body off and clean out the cunk and check iacv and fitv valve as it will allow u to properly clean it out as sometime gunk gets stuck in small places and other small holes for sensors. Happen to mine as i cleaned it out 3-4 time and no difference then i decided to take the whole throttle body off, it will prob take the same amount of time anyway and its just as easy.

ok can i just ask, are all the IACV on the B series same ? so i can use a B16a vtir IACV for a B18cjdm ??

back form the dead.

I did this DIY last week on a D-series 1st gen teggy.

I found that my IACV didnt have a mesh screen, is this right? I hope I havent dropped it.

Btw did you guys replace the seals when you did this?

there should be a mesh screen - it wont "fall out" so chances are yours doesnt have one. Its a good idea to chance those O rings at the same time

sht that was quick..

i scrolled down abit and found this link http://www.ozhonda.com/forum/showthread.php?t=64161

the part that I took out and cleaned looked like that. so I am guessing FITV = IACV?

no. The FITV is located ON the throttle body , where the IACV is located on teh back of the inlet manifold.
http://tech.ozhonda.com/diy/ICAV_clean/1.JPG

Looks like this
http://tech.ozhonda.com/diy/ICAV_clean/4.JPG

Went home and checked my throttle body. The only thing behind there was the FITV.
Is it possible my engine type doesn’t have this? Could it be located under the throttle body and to get to it I would have to take off the throttle body?

should be there... get a mirror if u cant see.

Or maybe some glasses if you really can't see....But you would not need to remove the TB, but removing the intake arm would help give you room. It is probably underneath the TB just where the intake arm attaches and there'll be a coolant line going to it.

subscribed

Quote:

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Originally Posted by stanleym

any idea where it is on the b series

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is right at the back, behild the intake manifold

the bolts are tight. and in my EG(b18c), one of the bolt is really hard to get to, shocket are too big
spaner is too short, the bolt is too tight for it.

still finding a way to un do that bolt

Could somone please show me a picture of where this is on a d16y4??

i just did this on a b18c2. previously it was jumping between 1.5k and 2.5k until it warmed up which it settled on 1k.

now its idling better, at 1.5k but still a bit wonky and the engine check light is on.

do i need to reset the ecu?

the car came with a tuned vafc2


EDIT: engine check light was on cos i forgot to plug the electrical cable back in lol... but the idle goes bad again. would it be in need of a retune?

just completed on b16a - was plenty dirty, idle settle to 900-1000 rpm buy now sitting at 15oo rpm - any clues no engine light just holding idle high - its like car is staying on cold warm up - any help would be appreciated

Adjust the idle control screw with screw driver. Im not sure where it is on the b16 but on the y4 its on the throttle body. Its a little flat head screw u adjust to increase or decrease the revs.

Thanks Gio - will give it a try - the funny thing is yesterday all was sweet idle @ 900-1000 - this morning didn't want to play idle stayed at 1500rpm after car was showing normal operating temp on gauge!! - is there any sensors for temp that enable cold and hot cycles???

I think mine sits around 1500 when warm, i do think its too high (should be about 1000) but i havnt got around to adjusting it.

I'd adjust the screw first (when warm) then if that does'nt work look further into it :)

when warm it shud be idling around 750-800 imo

my problem was the FITV not the IACV. fixed it up and no more jumping idle on cold start! idles at 1500 cold and 800-900 when warm

Yes yes,as above,the FITV.

Where's the honda-tech link to adjust the FITV?

Where is the FITV located on a B16a??? I found a link for fixing it on an accord

After you locate it...You adjust it by opening it up (2 screws),use a mirror to see in there,if needed and just turn it until it idles fine.You can fine adjust the idle with the idle/air screw.

I think I found it FITV is under throttle body - shouldn't be to hard to find the plate and uncover it

yeh under the throttle body. very tight squeeze. best to take off the intake and strut bar if you have one

where is it on a d15b4?

Quote:

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Originally Posted by dvsx

yeh under the throttle body. very tight squeeze. best to take off the intake and strut bar if you have one

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But you will need the intake on to set the idle properly.The best way is to use a mirror to see into it so you know what you are turning in thier cause there a few different setups inside them but it the same principle,you just turn/tighter or looser to adjust the idle.

hi,

does dc2r had IACV? where does it located? (any photo could shows?)

thanks alot :)

Found the problem was FITV - removed and tighted 2 and a half turns all is sweeeet!!! Idles perfect now

Excellent.

DC2R doesnt have a FITV right?

Quote:

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Originally Posted by Iwishiwasa Type R

DC2R doesnt have a FITV right?

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shouldnt. only pre 96 engines have them. someone confirm?

The FITV DIY is Up!

You Have Cleaned the IACV BUT Your Idle Is Still High/Erratic? Adjust The FITV

what if you spray carby cleaner on the other holes ?

Do U mean the IACV when ya got it apart?

yeahh

Quote:

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Originally Posted by beeza

Do U mean the IACV when ya got it apart?

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It will be fine,spray it everywhere but know CC dosen't work as well as Subaru Upper engine cleaner.

Just let it dry up before installing and get as much of the gunk out of there,you can use a flathead screwdriver to help get it off or metal brush etc

I need to replace the IACV gaskets on a jap b16a, anyone have any information on the gaskets for me?

U might need to buy some gasket paper and cut one out mate

sick as DIY gonna try this on the weekend :)

Did this on the weekend and has eliminated the hunting idle.

I also noted on a b18c the bolts holding the IACV on are good to shove in the coolant hose to stop them leaking. Also having some spare coolant to top up afterwards is a good idea if you are a little slow plugging the hose.

Cheers for this DIY, I just cleaned out my IACV then. The only twist was, my IACV was on the bottom of my throttle body ( 1999 EK1 D16Y4 ). Since it was impossible to get a wrench there, I ended up removing the whole Throttle body assembly and then the IACV. Cleaned both the IACV and the butterfly valve real good, also a bit of the intake manifold with what I could reach. Car is running nice and smoothly now!