Ronnoc74

I've got a '93 civic hatch with a D15B8 in it. It's done this since I bought the car a year ago and it didn't really bother me until recently since I'm going to start driving it daily soon.
What it does is once it's warmed up, it starts to have a fluctuating idle. Since I'm in the process of swapping my cluster I dont't quite know what it's at exactly RPM wise. I'm thinking it's somewhere between 600 and 1500 or so.

Here's a video I took of it...
http://www.youtube.com/watch?v=t1VZyLFPLbY

Any idea of what it is and how I could fix it?

mavvrik

damn dude that sounds rough. Theirs like......4 different noises going on there

Start with the basics, Check your IACV and check for vacuum leaks

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First off, and CELs?

Grab a can of carb cleaner and start spraying around the IM, TB, etc. See if you can get a change in idle. If you do, wherever it is, there is a leak.

Try cleaning your IACV, and your FITV.

Ronnoc74

No CEL's
The reason its so loud is because its just a straight header at the moment.
Pretty sure my car doesn't have a fitv. I've cleaned several of my friends fitv's and I don't see one on my intake manifold... I can post pictures of the I.M. if you guys want.
I haven't tried cleaning the iacv yet because I wanted to see what you guy thought about it first.

Would it mean I don't have a leak if I cover up the throttle body and the car dies? Could I use starting fluid to spray around it? that's the only thing I have right now...

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I'm not sure how fail safe covering the TB is. I would recommend using starting fluid lol. I could be wrong about the fitv, I thought all 90's d-series had them before 96, eh.

Ronnoc74

I just took the iacv off and it's not the right one for my car, the previous owner made it fit on there so it would work but there was only one bolt holding it in, both bolt holes don't line up.. It was on there awfully tight though, I thought I was going to break the bolt getting it out..

I'll go do the starting fluid test right now and post my results back here

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****, I meant WOULD'NT recommend :x

Ronnoc74

haha, alright, ill try and find something else. I think I used all my b-12 to take the paint off my z6 valve cover when I was re-painting it...

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Its only like $2 for some carb cleaner man, just wait till the morning

Ronnoc74

Guess I'm going to have to, I was hoping to solve this tonight. Oh well, atleast its not my dd yet

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Ronnoc74

Well I finally got some carb cleaner today so I started spraying it around my intake manifold and it didn't mess with the idle til I got to the iacv. I took it off and found out that it's not even the right one for my car.....

Tyla12

Make sure the map sensor plug on the trottlebody isnt swapped with the plug on the back of ur intake mani

Ronnoc74

Do you know the colors of the wires on the plugs so I know if they're in the right spots?

Swifty92

Map Sensor
3 wires spaced left to right
White
Green
Yellow/Green

TPS sensor
3 wires spaced left to right
Yellow/White
Red/Blue
Green/White

Ronnoc74

This is what my car had on it,

Map Sensor
Yellow/Green
Green/Blue
Pink/White

TPS
Yellow/White
Red/Black
Green/White


This is a '93 CX Hatch, I don't know if that has anything to do with why maybe the colors aren't the same....

vtechappy

welcome to the honda game no dseries i have ever owned has idled right.

Ronnoc74

I just cleaned the IACV that's on there and it's still idling the same, it's not revving as high but it is still doing it. I would have cleaned the fitv today too if my car had one..
I'm not really sure where to go from here, other than getting the right IACV but everywhere I've looked (ebay, HondaMarketplace on here, my local forum's for sale threads) no one has one for sale for my motor...

Ronnoc74

Since I'm having a hard time finding the iacv specific to my motor, could I just use some gasket maker and put it around the very outside edge of the iacv that's on there to get a better seal on it or would I be wasting my time?

Ronnoc74

anyone?

grumblemarc

iTrader: (4)

Get the correct part and respect your car.

97H22AEK

My H22A idled fine for 3-4 years before we decided to put nitrous on it. We REMOVED the intake manifold and installed the jets. Then put the intake manifold back on. Engine idle was all over the place, up & down, up & down. I torqued the intake manifold bolts per spec in the manual and also followed the tightening sequence. Idles perfect again !!!!!!!!!!

Ronnoc74

I'm going to in the long run but at this exact moment I can't afford to buy a brand new iacv which is a $167 dollar part from my local O'Reillys. I'm just looking looking for a temporary fix so I can actually start driving my car.

Ronnoc74

Even though I now know that the wring iacv is on there, I think I'll give it the benefit of the doubt and give this a shot tonight and see if it fixes anything.
thanks for letting me know this

Ronnoc74

Actually, 97H22AEK, you just gave me an idea. I have a d16z6 intake manifold because I'm eventually going to do a z6 mini me swap.
In theory, couldn't I just mount up that intake manifold and it would fix my idle and I would have a little more power (I know it won't be much of a power gain at all but anything will be better than what I've got now) It's complete with all the sensors and throttle body and everything. It should just be as simple as bolting it up and plugging the sensors in right?
Would this work or is my theory wrong?