Up & Down idle issue and check engine engine light!
Thread Starter
Registered!!
Joined: Jan 2018
Posts: 2
Likes: 0
Rep Power: 0 
Up & Down idle issue and check engine engine light!
From having weak idle on my 97 DX D16y7, I cleaned IACV and throttle body. After put them back on, idle started up and down with certain rhythm. Also there is check engine light came on.
I haven’t bleed air out of coolant yet.
Should I start with bleeding air out of coolant or diagnose check engine light first?
EDIT: Check the code for CEL and shows code 14 - IAC Valve (Idle Air Control) defective circuit or unplugged / defective sensor.
I haven’t bleed air out of coolant yet.
Should I start with bleeding air out of coolant or diagnose check engine light first?
EDIT: Check the code for CEL and shows code 14 - IAC Valve (Idle Air Control) defective circuit or unplugged / defective sensor.
Last edited by kanjokabure; Jan 18, 2018 at 05:40 PM.
Joined: Aug 2003
Posts: 21,620
Likes: 1,252
From: Las Vegas, NV
Rep Power: 512 
Re: Up & Down idle issue and check engine engine light!
May sound dumb, but double check that everything is plugged in properly?
OF top 99.5% creator (Formerly of the Puffinblunts variety)
Joined: May 2012
Posts: 3,634
Likes: 109
Rep Power: 211 Re: Up & Down idle issue and check engine engine light!
Coolant bleed:
Raise front of car as high as possible on jackstands
Turn climate control on max heat, recirculate mode, and fan off
Run engine (rad cap off) until radaitor fans turns on twice..add coolant mix as needed to radioator and reservoir.
After bleeding the coolant do an ECU reset (idle learn) at operating temp.
Raise front of car as high as possible on jackstands
Turn climate control on max heat, recirculate mode, and fan off
Run engine (rad cap off) until radaitor fans turns on twice..add coolant mix as needed to radioator and reservoir.
After bleeding the coolant do an ECU reset (idle learn) at operating temp.
FrankenCivic
Joined: Feb 2018
Posts: 34
Likes: 1
From: Columbus OH
Rep Power: 0 Re: Up & Down idle issue and check engine engine light!
not sure if you got this problem resolved yet or if you're even coming back to this forum...as megalodong said with the coolant bleed procedure and ecu reset...do those...the cel will go away when the battery is disconnected...if it comes back and it's still saying iacv then replace it...or better yet...check the wiring for it...clean the connection point...hell...look at your fuses...if all good then replace it......you'll be opening up the coolant system again by doing so, so bleeding again will be necessary...even a little air can cause a headache...and it doesn't take long anyways so why risk it...
a cleaner method for the bleed is get a "spill proof" funnel...works wonders
and riceboy is 100% correct..."Is it plugged in?" should be number one question when dealing with honda electrical systems...IACV valves rarely....yes i said rarely...not never....go bad...more times than not a rough idle is air in the coolant system
a cleaner method for the bleed is get a "spill proof" funnel...works wonders
and riceboy is 100% correct..."Is it plugged in?" should be number one question when dealing with honda electrical systems...IACV valves rarely....yes i said rarely...not never....go bad...more times than not a rough idle is air in the coolant system
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
eebing
8th & 9th Generation Civic 2006 - 2015
0
Sep 12, 2015 05:35 AM
Amtinez
Mechanical Problems/Vehicle Issues and Fix-it Forum
1
Jan 9, 2015 08:43 AM
mudhenFUF
Mechanical Problems/Vehicle Issues and Fix-it Forum
7
Aug 21, 2013 09:37 AM
TheRadiantMini
6th Generation Civic 1996 - 2000
4
Oct 21, 2010 07:57 PM
pcheruka
General Honda Civic Forum Archive.
3
May 5, 2009 03:14 PM
