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Old 15 May 2006, 08:58 pm
ftdn
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Default Erratic Idle

Took my 98 dx 5spd to the shop today and asked them to check my IAC.
Which I will check myself. There is some crappy air intake on the car
and the people at the shop said thats what was causing my up and down
idle. Can a crappy air intake cause the same issue as a malfunctioning
IACV?

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  #2 (permalink)  
Old 15 May 2006, 09:10 pm
Jason Johnson
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Default Re: Erratic Idle

In article <1147744705.680218.102960@j73g2000cwa.googlegroups .com>, "ftdn"
<john.michael.fiallos@gmail.com> wrote:

Took my 98 dx 5spd to the shop today and asked them to check my IAC.
Which I will check myself. There is some crappy air intake on the car
and the people at the shop said thats what was causing my up and down
idle. Can a crappy air intake cause the same issue as a malfunctioning
IACV?

An engine needs air in order to runs. If it does not get the air that it
needs,it could effect the way the engine runs. You should remove the
crappy air intake and visit a auto shop or junk yard place a air intake
system on the car that has a new filter. After you do that--take it back
to the shop and have them recheck the IAC. You may want to ask your
friends if there are any stores that sell after market air intake systems.
visit this site:
andysautosport.com
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  #3 (permalink)  
Old 15 May 2006, 09:15 pm
TeGGeR®
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Default Re: Erratic Idle

"ftdn" <john.michael.fiallos@gmail.com> wrote in
news:1147744705.680218.102960@j73g2000cwa.googlegr oups.com:

> Took my 98 dx 5spd to the shop today and asked them to check my IAC.
> Which I will check myself. There is some crappy air intake on the car
> and the people at the shop said thats what was causing my up and down
> idle. Can a crappy air intake cause the same issue as a malfunctioning
> IACV?
>
>



The "crappy intake" can foul the IAC with carbon and grit, so it's unable
to adjust the idle properly and you get a great big air leak.

A quick test:
Warm the engine up to full hot and keep it running.
Pull the "crappy intake" so you can see into the throttle body.
There ought to be a port visible in the throttle body.
Partially cover the port with your finger. Does the idle settle down?
Keep covering more of the port until the idle settles down.

Does it eventually settle down? If so, the IAC isn't moving correctly.

Do you see TWO ports in the throttle body, or just one? If your car has TWO
ports, then the lower one leads to a Fast Idle Valve. This should NOT be
admitting air when the engine is hot. If it does, the Fast Idle Valve is
bad, usually the result of a sludged cooling system.

Also check for other sources of air leakage, such as a vacuum line
disconnected.


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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Old 15 May 2006, 09:56 pm
Matt Ion
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Default Re: Erratic Idle

Erratic Idle? Isn't that Eric Idle's twin brother?


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  #5 (permalink)  
Old 15 May 2006, 11:08 pm
jim beam
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Default Re: Erratic Idle

ftdn wrote:
> Took my 98 dx 5spd to the shop today and asked them to check my IAC.
> Which I will check myself. There is some crappy air intake on the car
> and the people at the shop said thats what was causing my up and down
> idle. Can a crappy air intake cause the same issue as a malfunctioning
> IACV?
>

have you checked the coolant level in the radiator? if it's not full to
the top, it can cause idle problems because one of the sensors is not
fully immersed.
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  #6 (permalink)  
Old 16 May 2006, 10:26 am
'Curly Q. Links'
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Default Re: Erratic Idle

jim beam wrote:
>
> ftdn wrote:
> > Took my 98 dx 5spd to the shop today and asked them to check my IAC.
> > Which I will check myself. There is some crappy air intake on the car
> > and the people at the shop said thats what was causing my up and down
> > idle. Can a crappy air intake cause the same issue as a malfunctioning
> > IACV?
> >

> have you checked the coolant level in the radiator? if it's not full to
> the top, it can cause idle problems because one of the sensors is not
> fully immersed.


----------------------------------------

Beyond that, the reservior needs to be full too, since trapped air can't
escape if there's no coolant in the reservoir to replace it.
Honda premix is the foolproof thing to try first. You might have to top
it up to MAX twice.

'Curly'
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  #7 (permalink)  
Old 16 May 2006, 10:49 am
ftdn
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Default Re: Erratic Idle

>A quick test:
>Warm the engine up to full hot and keep it running.
>Pull the "crappy intake" so you can see into the throttle body.
>There ought to be a port visible in the throttle body.
>Partially cover the port with your finger. Does the idle settle down?
>Keep covering more of the port until the idle settles down.


>Does it eventually settle down? If so, the IAC isn't moving correctly.


it never settles out

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  #8 (permalink)  
Old 18 May 2006, 08:48 pm
ftdn
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Default Re: Erratic Idle

OK! I found out something today. The erratic Idle stops when the AC is
turned on! The AC has to be turned on though, It can't just be the
blower/fan. The AC also makes a whistling sound. Any idea why it
idles normally when the AC is turned on?

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  #9 (permalink)  
Old 21 May 2006, 01:12 am
Matt Ion
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Default Re: Erratic Idle

ftdn wrote:
> OK! I found out something today. The erratic Idle stops when the AC is
> turned on! The AC has to be turned on though, It can't just be the
> blower/fan. The AC also makes a whistling sound. Any idea why it
> idles normally when the AC is turned on?


Engaging the A/C kicks up the throttle a bit to compensate for the
additional drag of the compressor.

I'd really be suspecting a vacuum leak at this point.


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  #10 (permalink)  
Old 22 May 2006, 11:04 am
Hootie
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Default Re: Erratic Idle

Anyone know what the best way is to find out where the vacuum leak is?

"Matt Ion" <soundy@moltenimage.com> wrote in message
newsxTbg.179713$WI1.15548@pd7tw2no...
> ftdn wrote:
>> OK! I found out something today. The erratic Idle stops when the AC is
>> turned on! The AC has to be turned on though, It can't just be the
>> blower/fan. The AC also makes a whistling sound. Any idea why it
>> idles normally when the AC is turned on?

>
> Engaging the A/C kicks up the throttle a bit to compensate for the
> additional drag of the compressor.
>
> I'd really be suspecting a vacuum leak at this point.
>
>
> ---
> avast! Antivirus: Outbound message clean.
> Virus Database (VPS): 0620-3, 05/19/2006
> Tested on: 5/20/2006 11:12:33 PM
> avast! - copyright (c) 1988-2006 ALWIL Software.
> http://www.avast.com
>
>
>



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