Idle Adjustment screw - Honda-Tech - Honda Forum Discussion

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Idle Adjustment screw

Old 09-09-2008, 10:21 AM
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Default Idle Adjustment screw

I was wondering where the idle adjustment screw is located on our cars. I looked all around the TB but can find it. It's a 02 civic coupe Lx D17a1.. All replies appreciated.
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Old 09-09-2008, 11:58 AM
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Driver's side?
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Old 09-09-2008, 02:14 PM
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Default Re: (It Wasn't Me)

if im not mistaken, our idle is electronically controlled by the ecu.
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Old 09-09-2008, 04:57 PM
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i've read where people have adjusted them before, so i dont believe it's controlled by the ecu.. I may be wrong.. But that bolt in the pic ill take a look at it tomorrow. But how do u adjust.. Untighten then adjust then retighten???
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Old 09-09-2008, 07:31 PM
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<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2002civicrider &raquo;</TD></TR><TR><TD CLASS="quote">How do u adjust.. Untighten then adjust then retighten?</TD></TR></TABLE>

Sounds about right.


Modified by It Wasn't Me at 10:59 PM 9/9/2008
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Old 09-09-2008, 11:04 PM
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Default Re: (It Wasn't Me)

i believe the d17s are electronically controlled. the previous d's had adjustment screws tho. correct me if im wrong tho
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Old 09-09-2008, 11:09 PM
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I have messed with that screw before. Turning it to the right raised my idle. I didn't leave it in that position. I put it back to it's previous position where it had been marked with yellow paint.
(I was bored)
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Old 09-09-2008, 11:19 PM
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hmm ill go check tmrw.
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Old 09-10-2008, 06:12 AM
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idle speed is set by the ecu, a solenoid controls it. the screw simply changes the amount of incoming air to the IAC. Any changes you make to the screw will most likely be changed again by the ecu, unless it's out of the solenoids range. IE. too much air flow.
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Old 09-10-2008, 01:57 PM
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Yeah, a coworker clued me in on it this morning. He had me adjust the screw again, and leave it alone. (to prove his theory, and yours) Sure enough, the ecu set the idle back down to where it was supposed to be. Thanks for chiming in, though. Feedback is always appreciated.

Two points for jamescardenas07, as well.
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Old 09-11-2008, 10:14 AM
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Thanks everyone. So from what i have gathered u cant adjust the idle because the ecu resets it.. Thanks again.
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Old 09-11-2008, 07:40 PM
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Then what is the screw for lol? I know the ECU controls idle, but why would they put a screw there?
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Old 09-11-2008, 08:20 PM
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it sets base idle. it gives the car a certain amount of air when you first start it and let the IACV take over. You set it up by unplugging the IACV and adjusting the base idle with that screw. Once plugged in, the IACV will do the rest. It's pretty much a set it and forget it item.
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Old 06-24-2018, 01:00 AM
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Default Re: Idle Adjustment screw

I have a 2002 Honda civic ex I've been all over Google and YouTube and I'm seeing it on older cars and beginning to think my year dnt have it. My car at cold start is fine but once it's warmed up it goes up and down just a lil not bad and I took off the iacv cleaned it up put it back and it jumped real high then worked itself out but back to the normal up and down and I was looking for and wondering if my 02 civic ex has a fast idle valve?
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Old 06-24-2018, 12:40 PM
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Default Re: Idle Adjustment screw

Originally Posted by Steve Rodriguez View Post
I have a 2002 Honda civic ex I've been all over Google and YouTube and I'm seeing it on older cars and beginning to think my year dnt have it. My car at cold start is fine but once it's warmed up it goes up and down just a lil not bad and I took off the iacv cleaned it up put it back and it jumped real high then worked itself out but back to the normal up and down and I was looking for and wondering if my 02 civic ex has a fast idle valve?
If the idle is inconsistent when the engine is warm, its not a screw adjustment problem. Do you have a Check Engine Light active?
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Old 06-24-2018, 06:40 PM
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Default Re: Idle Adjustment screw

Originally Posted by toyomatt84 View Post
If the idle is inconsistent when the engine is warm, its not a screw adjustment problem. Do you have a Check Engine Light active?
yes my check light is on buy only bcuz of my cat
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Old 06-24-2018, 07:11 PM
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Default Re: Idle Adjustment screw

Originally Posted by Steve Rodriguez View Post
yes my check light is on buy only bcuz of my cat
That would cause the idle surging. Your secondary Oxygen Sensor is signaling the ECU to increase/decrease your fuel consumption based on its readings from the Catalytic converter.
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Old 06-25-2018, 06:38 PM
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Default Re: Idle Adjustment screw

you have a vacuum leak

find vacuum leak, fix vacuum

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