idling weird: going up and down on its own.
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Joined: Sep 2005
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From: Phoenix, az, usa
idling weird: going up and down on its own. some one please help!!!!!
Hi, i have a honda civic hatch 1990 and its fluctuating up and down, i wanted to know if anyone can help me please becasue everyone thinks i'm trying to challenge them to a race when i'm just trying to get to work and back home. and the noise is freaking annoying....someone please help me..... 
Modified by kizo at 5:05 PM 9/17/2005
Modified by kizo at 5:05 PM 9/17/2005
Joined: May 2004
Posts: 69
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From: MD, USA
Re: idling weird: going up and down on its own. some one please help!!!!! (kizo)
check your coolant level..sounds crazy, but can cause your IAC valve to act funny causing a weird idle, something like 800-1500 back and forth.
Junior Member
Joined: Sep 2004
Posts: 479
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From: farmington, wv, usa
Re: idling weird: going up and down on its own. some one please help!!!!! (SockEG)
diffinately sounds like your iacv, take it off and clean the screen real good. if that doesn't work check all of your vaccum lines to make sure there's no leaks with them. also might want to check your ignitor as well.
Honda-Tech Member
Joined: Oct 2004
Posts: 75
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From: lancaster, ca, usa
Re: idling weird: going up and down on its own. some one please help!!!!! (JimBlake)
on the front of your throttle body "middle, top" there is a brass screw with a screw driver slot.this is your idle screw.before removing it make sure you use a scribe and clean the slot out so you do not strip the slot.then take the air adjusting screw out and clean all the carbon off of it.and then put the screw back in and readjust your idle.
Honda-Tech Member
Joined: May 2003
Posts: 432
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From: Richmond, KY, USA
Re: idling weird: going up and down on its own. some one please help!!!!! (jonsswapshop)
Heres a link explaining how to check for FITV (Fast Idle Thermo Valve) problems. Always good to bump that thread if you find it useful, for others' sake when they search.
https://honda-tech.com/zerothread?id=1003988
**Note that this article uses pictures from a b16a motor, but the basic concept of what needs to be done is pretty simple to grasp for people who are even a little mechanically inclined.**
Hope this helps you.
https://honda-tech.com/zerothread?id=1003988
**Note that this article uses pictures from a b16a motor, but the basic concept of what needs to be done is pretty simple to grasp for people who are even a little mechanically inclined.**
Hope this helps you.
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Honda-Tech Member
Joined: Oct 2004
Posts: 75
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From: lancaster, ca, usa
Re: idling weird: going up and down on its own. some one please help!!!!! (honda_power69)
i dont think that 90 1.6 has fitv i know that is a comin problem with b16 .the big white screw loosens up.
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Joined: May 2003
Posts: 432
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From: Richmond, KY, USA
Re: idling weird: going up and down on its own. some one please help!!!!! (jonsswapshop)
Above poster could be correct, I'm not sure personally. But wouldn't take 30 seconds to pop the hood and get a visual answer...all I'm saying is it wouldnt hurt to check. Otherwise, 90% of every honda/acura idle problem I've come across in my days wrenching has been vacuum related. Be it from FITV problems, cracked/dry rotted vacuum hoses, gasket leaks, etc. Just go over every vacuum line you see, make sure theres no obvious breaks/cracks/or completely missing lines and get back to us.
Feedback from the original poster is the only way we can know if we've helped you, and what has or hasn't worked for you. So get back to us
Feedback from the original poster is the only way we can know if we've helped you, and what has or hasn't worked for you. So get back to us
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