you get the point, how do i fix this, people told me the iacv valve, where is this located?? is it the sensor assy map.? if so, how do i clean it??? thanks later.

 

CEL?

Checked vaccuum lines?

Map sensor probably worth a good checking as well.

 

Probably your IACV. It's located on the back of the intake manifold (at least it is on my B16A2). It's probably not dirty, maybe loose or broken.

There are various checks you can do to make sure it's actually your IACV. I don't know them all, but I'll see what I can find...

Are you throwing a Check Engine light?

 

http://hondaswap.com/articles/viewer.php?id=55

 

Could you copy and paste that material delvtecsol!

My car does the same. IACV is located on the back of the intake manifold as stated prior. Try unplugging it and then plugging it back in, if that doesnt help take it off (when the car is cold) and then clean it

 

Fixing an Erratic Idle

By: Adam


Let me give you some background on my del sol if you haven't been around long. It will be a year ago in March that I put my JDM B16 SIR II into my del sol. Since the day it went into the car, it would not idle correctly. There was always a surge. The following is a list of steps I took to cure my idle problem.. it took me just shy of a year to get it to work properly, but it's done!!

1) Check the voltage on your Throttle Position sensor. Sometimes when doing swaps, you have to use your old throttle position sensor because the one that came with the swap is almost always broken. The Honda ECU looks for .5 volts when the throttle blade is closed and 4.5 volts at wide open throttle. You can measure this with the aid of Hondata or an Apexi Vafc, or a handy old voltmeter.

2) Unplug your Idle Air Control Valve (IAC), which is located on the back of the intake manifold. Doing this SHOULD cause the idle speed to increase if it functioning properly. If it does not increase, then you have found your problem... go get a new one. If the idle speed does increase, begin to turn the bypass screw on the throttle body and bring the idle of the car down to like 500-600 rpm, then plug back in your IAC valve. This should bring the speed back to a normal 800 or so rpm. In the event that doesn't work...

3) Check your ignition timing and make sure it is at the stock spec. Usually 16*... see my article on cam timing.

4) Chances are now that you have a vacuum leak somewhere. Trace all of the vacuum lines and make sure there is no leak anywhere. Some people use a little bit of lubricant and spray it on the hoses to watch for bubbles. Personally I have never done this; so try at your own risk. If it still doesn't idle properly, keep reading.

5) Did your Throttle Body get bored out at all? Is Air bypassing the blade?

6) Another thing that sometimes causes cars to idle poorly is too much fuel. Do you have a Fuel Pressure regulator? Make sure that it has a vacuum reference and that it is within specs at static idle. Honda recommends 30-38 psi. So anywhere within there would be worth a try. To adjust your pressure at static idle, Hondata suggests that you do it without the car running. Turn the key to "ON" and the fuel pump will prime the system, then you can adjust your fuel pressure accordingly.

7) At this point I began to think it was my ECU causing the car to run poorly. I was running a p28 chipped with everything under the sun.. I had it all: skunk2 , mugen n1, jun, visions, spoon... all those reburned programs you can buy. None of them seemed to work. I looked into Hondata. Hondata is the savior of my idle... or so I thought. Apparently no one told me this, but Hondata had a problem running B16's with p28 ECU's for some reason. Well after several attempts of having new programs made that ran more lean at idle and generally just wasting my time... I found a lonely sole in Minnesota who had what he claimed was the magical map that fixes the p28/b16 idle problem. He sent it to me... I took it to Tom Payn at http://www.PaynTechnologies.com and had him write the program to my ECU and presto it's run great ever since.

The above is just a short list of possible things it could be ... but they are all things you can undertake without paying someone else to do it. Good Luck and if you need the hondata idle fix, or have any questions please email me: Pills@hondaswap.com

 

Good list, but try the MOST SIMPLE solution first...... bleed the coolant. 9 times out of 10, on cars that I've worked on with irratic idling, purging the coolant lines of any air bubbles usually solves the problem <- make sure the is at warm operating temps before you bleed it, and keep the radiator cap off while doing it so you refill coolant as needed. Now, if this doesn't solve your problem, you just made sure there's no air in the lines so you can go onto the next steps like cleaning out your IAC sensor and checking for vacuum leaks and so on.

 

Man you guys left out someting that ive did that has fixed an irratic idle everytime. Ok listen up. First of all take your throttle body off. You dont have to take it all the way outta the car so just leave the collant lines hooked up to it and take it loose from the intake manifold. Now you wanna flip the TB over and look on the back side bottom part of it. Theres a little gold plate with 2 screws in it. Take those screws out and take that plate off. Once you remove the little gold plate inside will be a plunger type nipple with a plastic ring around it with a groove it each side. (wish i had some pics) What you wanna do is take a flathead and put it in the groove, then turn the plastic ring clock wise until it doesnt turn anymore. Itll prolly turn like 2 to 3 rotations depending on how bad your idle was off. Slap it all back together and then turn your idle screw on your TB all the way tight(clockwise) then back it out like 2 to 3 turns. Then start your car up and enjoy your smooth idle. Let it warm up and adjust the idle screw accordingly.


[Modified by jDmDxTuRd, 11:59 AM 3/4/2003]

 

I have this problem before... and someone from HT told me to change the Fast Idle Thermo Valve(FITV) and he's right... it fix the probelm....

 

What's up new to the board
i had the same problem with my 93 civic lx
i tried everything i mean everything tps ecv map reset ecu replaced ecu
oh and by the way the tps is rivit3d on so it s a pain in the ***
the cat 2 post above may know exzactly what he is talkiing about but
i ended up going to the junkyard one day and getting a intake off a wrecked car
30$ no put it on fixed the guy at the honda placed i talked to say it is a wacks or wax valve that is in the throttle body

when you car is jumping in idle take off your cold air intake or whatever you have
and you will see a hole on the inside of the intake put your finger over and you car will idle perfect no bullshit but seriously the most cost effective way is to get a new intake 30$ is nuthing
peace

one nation underground invisible.

 

How could 30 bucks be cost effective when you can fix it urself for free. The valve i was speaking of on the bottom of the throttle body is the (fitv) and this will fix you problem.

 

ummm, no. Unplugging your IAC is going to cause NO air to bypass the throttle body, therefor decreasing idle speed.

If you unplug it and the problem, stops, then you know it's the iac.

 

how would i clean the iac valve?

 

i used brake parts cleaner, it did the trick and evaporates fast.

 

how much does this stuff cost????

 

Like $2.

 

awesome, i am going to try some of this. and will this clean it, and where do i have to spray it??

 

i think that could be it also...could be wrong