Surging Idle? How-To Tech Article...(56k beware)
Joined: Feb 2004
Posts: 223
Likes: 0
From: ca, America
Re: (spoonef)
ive had this idle problem for months now in my hatch, when i put my finger on the hold in the TB, the idle goes to 1,000k and it has suction, at start up when car is cold it idles at 3,000k and after a few minutes it starts jumping up and down from 2k to 3k. sometimes when i get off the freeway after a long drive, the idle stays constant at 2k. now my question is which valve do i have to change, the fast idle or the idle air control valve??? please help
Joined: Nov 2002
Posts: 184
Likes: 0
From: East Coast
Re: (honda95civic)
i dunno if it was mentioned previously, but other causes for such an idle could be-
air gaps in coolant, requires a good bleed
TPS could be out of spec
I have found that an easy way to clean the IACV is carb cleaner, however, they can go bad, so if you have another or a friend who has another, try that out too as part of the troubleshoot...
Note- some tb's do not have FITV and someone mentioned jsut accessing via the plate on the bottom- this is correct. undo the plate, and tighten the plastic screw if it is very loose.
air gaps in coolant, requires a good bleed
TPS could be out of spec
I have found that an easy way to clean the IACV is carb cleaner, however, they can go bad, so if you have another or a friend who has another, try that out too as part of the troubleshoot...
Note- some tb's do not have FITV and someone mentioned jsut accessing via the plate on the bottom- this is correct. undo the plate, and tighten the plastic screw if it is very loose.
Honda-Tech Member
Joined: May 2003
Posts: 1,265
Likes: 0
Re: (337 GTI 1.8t)
Something to note: The hose nearest to the firewall doesn't need to be removed. It is connected to the throttle body which sends/recieves coolant through the fitv. The hose connected directly to the valve may be removed but I didn't have to disconnect anything.
Joined: May 2005
Posts: 12
Likes: 0
From: Underground, CA
Re: (SeaQuake)
can someone do a little write up for a d16y8 motor. been having this surging/bogging idle problem for a while now. so this is my last resort for trying to fix it. already flushed/bleed the radiator, clean fuel injectors, clean air filter, new fuel filter, new plugs and wires and etc. i took off my intake and covered the hole and the car died on me. i don't know what else to do cause the write up was for a b16 motor so i don't know where the parts are for the d16y8 motor. would appreciate it if someone with the same motor as me told me what to do.
Joined: Feb 2004
Posts: 223
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From: ca, America
Re: (hiphopmenace-ej8)
im not sure if there is a difference in the motors, but on my b16a i just fixed my idle problem, i took off the fast idle (FITV) and re-screwed in that thing that gets loose. fixed my idle.
Honda-Tech Member
Joined: May 2003
Posts: 1,265
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Re: (hiphopmenace-ej8)
You may have an air leak<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hiphopmenace-ej8 »</TD></TR><TR><TD CLASS="quote">can someone do a little write up for a d16y8 motor. been having this surging/bogging idle problem for a while now. so this is my last resort for trying to fix it. already flushed/bleed the radiator, clean fuel injectors, clean air filter, new fuel filter, new plugs and wires and etc. i took off my intake and covered the hole and the car died on me. i don't know what else to do cause the write up was for a b16 motor so i don't know where the parts are for the d16y8 motor. would appreciate it if someone with the same motor as me told me what to do. </TD></TR></TABLE>
Honda-Tech Member
Joined: Jan 2003
Posts: 8,132
Likes: 5
Re: (honda_power69)
Nice write-up. I wouldn't mind seeing it stickied too. How many posts PER WEEK about 'my idle is screwed up'...?
But you might want to say way upfront, how newer engines (OBD-2?) don't have an FITV. It's job was incorporated into the AICV. I didn't find these 2 notes until I read way down thru all the responses.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blase »</TD></TR><TR><TD CLASS="quote">... For some reason, the JDM TB doesn't have a FITV...</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 337 GTI 1.8t »</TD></TR><TR><TD CLASS="quote">Note- some tb's do not have FITV...</TD></TR></TABLE>
But you might want to say way upfront, how newer engines (OBD-2?) don't have an FITV. It's job was incorporated into the AICV. I didn't find these 2 notes until I read way down thru all the responses.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blase »</TD></TR><TR><TD CLASS="quote">... For some reason, the JDM TB doesn't have a FITV...</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 337 GTI 1.8t »</TD></TR><TR><TD CLASS="quote">Note- some tb's do not have FITV...</TD></TR></TABLE>
Joined: Dec 2005
Posts: 5
Likes: 0
From: livermore, ca, usa
92 accord lx fixed
Just fix my 92 accord idle surge in five minutes without unbolting anything. just move the throttle cable to the side remove the two screws on the cap of the FITV and tighted the plastic piece as stated. replace the cap, screws, throttle cable and blam no more surge. Helped alot thanks!!!!!! 
Junior Member
Joined: Nov 2003
Posts: 13
Likes: 0
From: Laramie, WY, USA
Thank you very much for the great write up!! I just finished doing this and it fixed the idle problem. I simply just pulled off the FITV and tightened the plastic thing and put it back on. Worked well and no more surge. My car is a 94 Civic EX by the way.
