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Honda civic "low" idle

  • bjørn.ali.stokman
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3 years 5 months ago #55880 by bjørn.ali.stokman
Honda civic "low" idle was created by bjørn.ali.stokman
Honda civic 1997 b16a2

Hello!

I was looking for some help on a idle issue.

Whenever I give i press the clutch in while driving, so it goes in neutral and I'm coasting. The RPMs drop to nearly 400rpms then bounces back up to 7-800 which is the normal idle.

Doesn't matter if it's warm og cold, does this if I'm standing still and I rev it and let it drop down, it also goes really low. Almost dies, but doesn't.

Any help regarding this would be appreciated, I myself is suspecting the IACV or maybe a bad alternator?

No DTC. Have access to some PIDS and a scope if necessary.
Parts cannon first, then diag.

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  • VegasJAK
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3 years 5 months ago - 3 years 5 months ago #55883 by VegasJAK
Replied by VegasJAK on topic Honda civic "low" idle
Sounds like the dashpot/idle stop. If equipped check vacuum line.
btw, I'm not advising altering the idle stop in anyway only check that it's working ;)
"an open mind let's knowledge flow in and wisdom flow out for a man who has neither never listens to those who have both".
Being wrong doesn't bother me, it's being right and not understanding why that does
Last edit: 3 years 5 months ago by VegasJAK.

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3 years 5 months ago - 3 years 5 months ago #55887 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Honda civic "low" idle
Not an unknown issue on Honda of this era usually just remove and clean the IACV and throttle body with carb cleaner and a toothbrush. Try this first before looking for anything more complicated.
ISTR Paul made a video on a similar Honda issue.
I would strongly advise not to alter the throttle idle stop.
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
Last edit: 3 years 5 months ago by Andy.MacFadyen.
The following user(s) said Thank You: Noah, juergen.scholl

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  • bjørn.ali.stokman
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3 years 5 months ago #55894 by bjørn.ali.stokman
Replied by bjørn.ali.stokman on topic Honda civic "low" idle
I will see if i can find any of ScannerDanners videos.

But i have to say, i took apart the IACV and it is clean as a whistle.
No weird fuel trims, nothing weird (to me atlest) under load.
Nothing to point me in any direction.

Im not sure where the idle stop is located on my car, I did adjust the bottom RPM to a higher level just so it wouldnt almost die when letting go of the gas after Acceleration, but that is only temporary, I want to treat the problem, not the symptom.
It still bounces of the bottom though, and idle drops when turning the wheel, enabling rear defroster and so on.
Parts cannon first, then diag.

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3 years 5 months ago #55895 by juergen.scholl
Replied by juergen.scholl on topic Honda civic "low" idle

I would strongly advise not to alter the throttle idle stop.

+1 (or 2...)
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.

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3 years 5 months ago #55899 by VegasJAK
Replied by VegasJAK on topic Honda civic "low" idle

But i have to say, i took apart the IACV and it is clean as a whistle.

Did you make sure the shutter valve was rotating freely? You may have, just asking.

"an open mind let's knowledge flow in and wisdom flow out for a man who has neither never listens to those who have both".
Being wrong doesn't bother me, it's being right and not understanding why that does

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3 years 5 months ago #55903 by bjørn.ali.stokman
Replied by bjørn.ali.stokman on topic Honda civic "low" idle

But i have to say, i took apart the IACV and it is clean as a whistle.

Did you make sure the shutter valve was rotating freely? You may have, just asking.


No, i dont have gaskets so didnt want to take it any further, but ill make sure to check that as soon as i get a gasket.
Parts cannon first, then diag.

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