Adjusting base idle
#1
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?
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?
#5
Re: Adjusting base idle
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?
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?
#6
Re: Adjusting base idle
If I want to install ELD, is that even possible?
#7
Re: Adjusting base idle
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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#8
Re: Adjusting base idle
Yes. Just pick up the entire hood fuse box from an 92-95 Civic.
Reduces alternator output when load is low.
Nope
How does it save fuel?
From what I know, it increases the overall voltage and rpm when more electrical load is applied.
#9
Re: Adjusting base idle
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)
So how do i adjust the base idle now?
#10
-Intl Steve Krew
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?
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?
#11
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?
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?
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.
#12
-Intl Steve Krew
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.
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.
#13
Re: Adjusting base idle
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.
#14
-Intl Steve Krew
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?
#15
#16
Re: Adjusting base 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.
#17
Re: Adjusting base idle
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.
Will try the internet again.
#18
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.
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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