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A stupid question about IACV

 
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Old 09-22-2012, 06:51 PM
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Icon5 A stupid question about IACV

I read, somewhere, about a guy whose 'lude was having idle issues, and he said that he cleared that up by cleaning the IACV. He also posted instructions on how to clean it. I'm in the middle of following said instructions.

Crap! The screen in my IACV was so gunked up, I'm amazed the car started, at all!! I sprayed some Simple Green into it, I'm letting it dry for about half an hour, then I'm going to put it back.

Here's the stupid question: Why are there coolant hoses running into and out of the IACV??? What purpose do they serve?

Tnx,

^_^
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Old 09-22-2012, 07:37 PM
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Re: A stupid question about IACV

I think that's meant to keep the iacv valvel from freezing ......
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Old 09-22-2012, 07:39 PM
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Re: A stupid question about IACV

I just finished putting the IACV back, and started the car. MOST of the idle issue has disappeared. Still getting just a hint of the engine wanting to die, after it's warmed. I suspect the air filter; I've ordered a K&N, it should be here in a week. Next is fuel filter.

^_^
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Old 09-22-2012, 07:41 PM
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Icon7 Re: A stupid question about IACV

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Originally Posted by Amd3dnow3 View Post
I think that's meant to keep the iacv valvel from freezing ......
Considering that it's mounted to the intake manifold, I just assumed that any moving parts would be kept warm just from the heat of the engine. But if that's what they do.. (shrug)

Thanks!

^_^
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Old 09-23-2012, 12:44 AM
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Re: A stupid question about IACV

coolant in an out is for engine temperature. valve open when car is cold and it's close when hot coolant run thro it
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Old 09-23-2012, 03:54 PM
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Re: A stupid question about IACV

Quote:
Originally Posted by WolfShade View Post
I read, somewhere, about a guy whose 'lude was having idle issues, and he said that he cleared that up by cleaning the IACV. He also posted instructions on how to clean it. I'm in the middle of following said instructions.

Crap! The screen in my IACV was so gunked up, I'm amazed the car started, at all!! I sprayed some Simple Green into it, I'm letting it dry for about half an hour, then I'm going to put it back.

Here's the stupid question: Why are there coolant hoses running into and out of the IACV??? What purpose do they serve?

Tnx,

^_^
The IACV is controls the amount of air your car has at idle. The reason it has coolant hoses is because it and the FITV (Fast-Idle Thermo valve) uses it to know when to operate. The FITV runs when the car is cold (it can tell by the coolant temp), it holds the idle at a higher rpm until the car is warmed up. Then after it is warm (the wax in the FITV melts letting it know the car is warm) the IACV takes over and controls the correct amount of air needed for idle.
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Old 09-23-2012, 03:58 PM
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Re: A stupid question about IACV

If your idle is still bad I would consider cleaning your EGR ports and valve.
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Old 09-23-2012, 04:04 PM
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Re: A stupid question about IACV

Quote:
Originally Posted by WolfShade View Post
I just finished putting the IACV back, and started the car. MOST of the idle issue has disappeared. Still getting just a hint of the engine wanting to die, after it's warmed. I suspect the air filter; I've ordered a K&N, it should be here in a week. Next is fuel filter.

^_^

My car did that when it needed the valves adjusted (every 30k reg maintenance). It was doing this but eventually threw misfire codes as well for cylinder 1 and 3, which the valve clearance were to tight.

I did the same thing you did when the idle started dipping (never died though), if the misfire code shows up do the valve adjustment.

If your car is idling rough (you can feel it shaking or hear it shaking the sunroof or other car parts) then it may be the valve clearance, so do the valve adjustment.

Moral of story do a valve adjustment.

If you have done that than check vacuum (lines), fuel (filter, injectors), and ignition (spark plugs, wires, distributor rotor & cap).

Please diagnose before throwing parts at it. Just my two cents.

Hope this was helpful!
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Old 09-23-2012, 04:04 PM
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Re: A stupid question about IACV

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Originally Posted by Travis View Post
If your idle is still bad I would consider cleaning your EGR ports and valve.
This is also a good idea!
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Old 09-23-2012, 05:41 PM
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Re: A stupid question about IACV

Just curious. After you re-installed the IACV, did you bleed the coolant system?
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Old 09-23-2012, 07:14 PM
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Icon14 Re: A stupid question about IACV

Quote:
Originally Posted by Travis View Post
If your idle is still bad I would consider cleaning your EGR ports and valve.
I will look up instructions for that, and if I can do it, tonight, I will. Tnx!

^_^
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Old 09-23-2012, 07:15 PM
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Re: A stupid question about IACV

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Originally Posted by jaxprelude View Post
Just curious. After you re-installed the IACV, did you bleed the coolant system?
I did not. Was not aware that I needed to. How difficult? One- or two-person job?

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Old 09-23-2012, 07:28 PM
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Re: A stupid question about IACV

Just loosen the coolant bleeder bolt on top of the thermostat housing until coolant starts slowly flowing out of it. You will see air bubbles coming out with the coolant. Once the coolant stream is clear of all bubbles, tighten the bleeder bolt and check your coolant level in the radiator. If it is low, top it off.
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Old 09-30-2012, 04:47 PM
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Icon5 Re: A stupid question about IACV

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Originally Posted by jaxprelude View Post
Just loosen the coolant bleeder bolt on top of the thermostat housing until coolant starts slowly flowing out of it. You will see air bubbles coming out with the coolant. Once the coolant stream is clear of all bubbles, tighten the bleeder bolt and check your coolant level in the radiator. If it is low, top it off.
Does the engine have to be running, for this?
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Old 09-30-2012, 05:00 PM
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Re: A stupid question about IACV

No such thing as a stupid question it's the person that doesn't ask the question that is stupid :)
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