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Adjusting base idle

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Old 09-14-2015, 09:01 AM
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Default Adjusting base idle

Its a CIVIC EG Sedan, originally carburetor but swapped to D15b dual vtec (aka 3 stage) off an A/T car, but using M/T.

So I wanted to adjust the base idle since current idle seems a little low, and when there is load of a/c and other components, its even lower but nothing serious. I just want a slightly higher idle.

I read around that first the operating temp should be reached, car to be switched off, and then the IACV is to be unplugged before setting base idle.

The car is then to be started and base idle to be adjusted using the screw.

However, when I started the car after following the initial steps, the RPM reached to 1500 rpm and stayed there with regular cut offs in between (reducing to around 1300 rpm and back to 1500 rpm).

The idle screw was already all the way in (tight), and couldnt be reduced.

Where am I wrong?
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Old 09-14-2015, 04:05 PM
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Default Re: Adjusting base idle

Clean the IACV and FITV and then try again.

CEL codes?
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Old 09-14-2015, 10:03 PM
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Default Re: Adjusting base idle

Originally Posted by RonJ View Post
Clean the IACV and FITV and then try again.

CEL codes?
Aah! Now that's a task for Sunday.
No cel codes (other than eld).
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Old 09-15-2015, 05:16 AM
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Default Re: Adjusting base idle

Why not fix the ELD code. It's a fuel saving device.
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Old 09-15-2015, 05:22 AM
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Default Re: Adjusting base idle

Originally Posted by RonJ View Post
Why not fix the ELD code. It's a fuel saving device.
There is no ELD component in my car :D

Like I informed earlier, its a swap from Carby engine to Vtec. In carby engine, there are no components that have anything to do with the ECU since there isnt any ECU in carby cars.

Therefore no ELD. If I want to install ELD, is that even possible?
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Old 09-15-2015, 05:26 AM
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Default Re: Adjusting base idle

Originally Posted by maverickiz3d View Post
There is no ELD component in my car :D

Like I informed earlier, its a swap from Carby engine to Vtec. In carby engine, there are no components that have anything to do with the ECU since there isnt any ECU in carby cars.

Therefore no ELD.
I think some carb Civics have an ECU.

If I want to install ELD, is that even possible?
Yes, it's part of the hood fuse box.
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Old 09-15-2015, 05:40 AM
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Default Re: Adjusting base idle

Originally Posted by RonJ View Post
I think some carb Civics have an ECU.


Yes, it's part of the hood fuse box.
Well mine didnt. And fuse box doesnt have it nor any provision for it. So can I if I find one from a junkyard?

How does it save fuel? From what I know, it increases the overall voltage and rpm when more electrical load is applied.
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Old 09-15-2015, 11:58 AM
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Default Re: Adjusting base idle

Originally Posted by maverickiz3d View Post
So can I if I find one from a junkyard?
Yes. Just pick up the entire hood fuse box from an 92-95 Civic.

How does it save fuel?
Reduces alternator output when load is low.

From what I know, it increases the overall voltage and rpm when more electrical load is applied.
Nope
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Old 09-16-2015, 10:09 AM
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Default Re: Adjusting base idle

Originally Posted by RonJ View Post
Clean the IACV and FITV and then try again.

CEL codes?

I guess i dont have to clean the IACV! I landed on this thread by mistake.

https://honda-tech.com/honda-civic-d...ience-2997948/

the 2 wire is a normally closed valve (the engine dies without the harness connected)... the 3 wire is a normally open valve (the engine races without the harness connected)
My IACV is the 3 wire one, from an A/T ek3 vi.

So how do i adjust the base idle now?
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Old 09-16-2015, 10:20 AM
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Default Re: Adjusting base idle

What is the idle speed you are looking for when the IACV is not plugged in?

What is the idle speed with the car out of diagnostic mode and IACV is plugged in?

Did you use a paper clip to jump the plug that should be in the passenger side under the dash to put the car into diagnostic mode when trying to adjust the idle screw?

Do you know what the idle should be adjusted to in diagnostic mode?
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Old 09-16-2015, 10:32 AM
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Default Re: Adjusting base idle

Originally Posted by Caoboy View Post
What is the idle speed you are looking for when the IACV is not plugged in?

What is the idle speed with the car out of diagnostic mode and IACV is plugged in?

Did you use a paper clip to jump the plug that should be in the passenger side under the dash to put the car into diagnostic mode when trying to adjust the idle screw?

Do you know what the idle should be adjusted to in diagnostic mode?
I followed the steps given here: How To Adjust Honda Civic Idle Speed - My Pro Street

According to those steps, after disconnecting the IACV, I was expecting to start the car with accelerator pedal depressed, but instead it started at a high rpm itself.

So with the IACV unplugged, was looking for very low idle that a depressed pedal would be required to start the car.

Idle speed is around 700, but would like to have it around 850-900 so that when a/c turns on, it doesnt go below under 800 on compressor load. Why i want 800 on a/c, is because I feel the a/c doesnt work effectively at lower rpms.

No I didnt jump the plug, as I was not asked to in the guide. So I assume its required? I thought it was for adjusting ignition timing only.
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Old 09-16-2015, 11:23 AM
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Default Re: Adjusting base idle

I may be getting the jumper wrong. I don't have an FSM in front of me at the moment.

I think the ELD might adjust the idle with the AC on...there should be some provision for the idle to kick up when the compressor kicks in.
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Old 09-16-2015, 11:33 AM
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Default Re: Adjusting base idle

Originally Posted by Caoboy View Post
I may be getting the jumper wrong. I don't have an FSM in front of me at the moment.

I think the ELD might adjust the idle with the AC on...there should be some provision for the idle to kick up when the compressor kicks in.
The idle increases when a/c is switched on (which was recently fixed in another thread thanks to RonJ). If thats what you are talking about.

However, yes, eld should factor in by giving some juice to the iacv (which i read somewhere). But since there isnt any eld present, i would like to manually keep a slightly higher rpm than normal.
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Old 09-16-2015, 11:47 AM
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Default Re: Adjusting base idle

Just throwing this out there, if you can't adjust base idle the 'normal' way, why not leave everything as is (IACV connected) and just adjust the idle screw out to bump up the idle?
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Old 09-16-2015, 02:55 PM
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Default Re: Adjusting base idle

Originally Posted by maverickiz3d View Post
My IACV is the 3 wire one, from an A/T ek3 vi.

So how do i adjust the base idle now?
You need the service manual for the auto ek3 vi.
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Old 09-16-2015, 11:25 PM
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Default Re: Adjusting base idle

Originally Posted by Caoboy View Post
Just throwing this out there, if you can't adjust base idle the 'normal' way, why not leave everything as is (IACV connected) and just adjust the idle screw out to bump up the idle?
Done that too, but I notice that the rpm usually comes back down to original position somehow after driving around. Maybe thats just me.
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Old 09-16-2015, 11:28 PM
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Default Re: Adjusting base idle

Originally Posted by RonJ View Post
You need the service manual for the auto ek3 vi.
finding a service manual for ek3 vi, i.e. for the d15b 3 stage is almost impossible. I have searched around a lot before, but only found some pages of it in Polish language i think (or maybe it was Spanish).

Will try the internet again.
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Old 09-21-2015, 09:38 PM
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Default Re: Adjusting base idle

So i cleaned the IACV and throttle body. It was all black inside, but no goo/gunk that would seem alarming. Sprayed with carb cleaner and let it dry and reinstalled.

RPM raised up a little and in some instances it was "hunting". Yes, I bled the coolant, but it was still hunting. Checked for vacuum leaks as well by spraying carb cleaner at joints. No leaks.

Then later again bled the coolant, reset the ecu, and till now its fine.

After opening it I realized I should have first made arrangements of gaskets for the throttle body and IACV, but surprisingly both were in great condition. Not sticky or anything.
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Old 10-16-2015, 03:13 PM
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Default Re: Adjusting base idle

How about you make your own thread, instead of trying to hijack someone else's. Go read the rules.
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Old 10-16-2015, 03:17 PM
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Default Re: Adjusting base idle

Post moved and thread locked.
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