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iacv cel

 
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Old 12-07-2011, 07:07 PM
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iacv cel

My idle has been funky since I bought the prelude about a month ago. It bounces between 1k and 1.5k rpms, but when it warms up it usually levels out. Today when I was driving home my cel came on for the first time. I stopped at autozone to get it checked out, and it was throwing iacv code. My question is what does the iacv system consist of because the valve itself is brand new. Could it of possibly not been cleaned well on the intake side of the valve or could it be another part of this system? Thanks
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Old 12-08-2011, 03:37 AM
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Re: iacv cel

Can you verify that the valve is REALLY new? As in, did you buy it? Or did the previous owner tell you it was new. If it really is new, you may need to clean up the passages. Take the throttle body off and have a look.
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Old 12-08-2011, 10:38 AM
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Re: iacv cel

check your coolant level and bleed the system.
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Old 12-08-2011, 11:56 AM
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Re: iacv cel

IACV only affects the car once its warm. If it is bouncing whilst warming up it may well be the FITV.

To test get the car up to operating temperature and idle bouncing
Remove the intake pipe from the throttle body and with engine running stick your finger over the hole that can be seen in the bottom left of the throttle body (before the butterfly)
If this stops the bouncing then your FITV is the culprit - either from being faulty, stuck waxstat or poor coolant flow.

If the bouncing doesn't stop, stick your finger over the hole at top left of TB. If bouncing stops then IACV is the culprit.

If neither of these make a difference then you have an air leak somewhere else.

Sometimes this can be caused simply by poor base idle and air bypass screw adjustment but usually only if the TB has been messed with.


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Old 12-09-2011, 11:01 AM
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Re: iacv cel

Quote:
Originally Posted by jhunter View Post
Can you verify that the valve is REALLY new? As in, did you buy it? Or did the previous owner tell you it was new. If it really is new, you may need to clean up the passages. Take the throttle body off and have a look.
I didn't buy it, but it looks brand new granted i know you can clean it up, but the guy was honest about everything else. Also, would i take the valve off to clean that up or just the tb?
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Old 12-09-2011, 11:04 AM
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Re: iacv cel

Quote:
Originally Posted by blaclabel1911 View Post
check your coolant level and bleed the system.
I've done this already with no luck
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Old 12-09-2011, 11:11 AM
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Re: iacv cel

[QUOTE=merlin;582753]IACV only affects the car once its warm. If it is bouncing whilst warming up it may well be the FITV.

To test get the car up to operating temperature and idle bouncing
Remove the intake pipe from the throttle body and with engine running stick your finger over the hole that can be seen in the bottom left of the throttle body (before the butterfly)
If this stops the bouncing then your FITV is the culprit - either from being faulty, stuck waxstat or poor coolant flow.

If the bouncing doesn't stop, stick your finger over the hole at top left of TB. If bouncing stops then IACV is the culprit.

If neither of these make a difference then you have an air leak somewhere else.

Sometimes this can be caused simply by poor base idle and air bypass screw adjustment but usually only if the TB has been messed with.


Thanks for the info, but being 5th gen I don'e believe I have the FITV do i? I'm gonna try to clean it up tonight and hope that helps. I'll post what I find out.
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Old 12-12-2011, 04:58 AM
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Re: iacv cel

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Originally Posted by kellensering View Post
Thanks for the info, but being 5th gen I don'e believe I have the FITV do i? I'm gonna try to clean it up tonight and hope that helps. I'll post what I find out.
Your FITV is located right underneath your throttle body ;) Yes 5G's have them.
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