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What could this problem be? (Video Included)

 
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Old 01-06-2013, 12:56 AM
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What could this problem be? (Video Included)

This is during startup [does not matter if it is the first start, or third start]
This does not happen a lot, but it does happen sometimes. It does it more during the cold weather, but I believe that it did it a couple times during the summer.
I still have an issue with hesitation (my thread - Hesitation Issues...Again Help!)
As of recently, the only thing that I have done after the above thread, was clean out my IACV (Intake Air Control Valve), which I thought would fix the problem with the idle, but it did not.
No check engine codes at all!


Issue that I think could solve the problem, but hoping for some input
- TPS (throttle position sensor)
- O2 sensors

Here is the video


Thanks
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Old 01-06-2013, 01:02 AM
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Re: What could this problem be? (Video Included)

this is only while it is cold? if so it is the FITV or Fast Idle Thermocontrol Valve. mine does the same thing, a little worse actually, but only until it is warm. the FINAL idle problem thread!!!!!
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Old 01-06-2013, 01:07 AM
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Re: What could this problem be? (Video Included)

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Originally Posted by rocker22dallas View Post
this is only while it is cold? if so it is the FITV or Fast Idle Thermocontrol Valve. mine does the same thing, a little worse actually, but only until it is warm. the FINAL idle problem thread!!!!!
Nice, I was looking for that thread after I posted, lol.
It can do it when it is warm as well, not only on a cold start.
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Old 01-06-2013, 01:19 AM
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Re: What could this problem be? (Video Included)

Idle control motor. Take it off and clean it , my old truck did that
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Old 01-06-2013, 01:25 AM
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Re: What could this problem be? (Video Included)

on our preludes there is also an Idle air control valve (IACV) which is a normal part to need to be cleaned. it is a cylinder mounted just above your fuel rail on the throttle body. held on by 2 screws.

on my FITV, i cannot tighten it like the thread said to because the bolts to open the plate are seized, and one of them broke off. but for the IACV you just take it off, flush it out with carb cleaner, make sure the screen is clean, let it all dry out, and put it back on. after cleaning both and tightening the fitv to the correct specs if possible, your problem should be fixed.
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Old 01-06-2013, 09:17 AM
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Re: What could this problem be? (Video Included)

Could be a vacuum leak also. That'll cause a surging idle as well
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Old 01-06-2013, 11:40 AM
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Re: What could this problem be? (Video Included)

something still to do

clean injectors
new air filter
new iat & pcv
adjust valves
adjust ignition
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Old 01-06-2013, 12:13 PM
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Re: What could this problem be? (Video Included)

Don't forget if you remove the water hoses to said valves and water pours out, you're soon introducing mr. air bubble into the cooling system. That will wreck your progress by confusing your computer. Ugh!! Then you get another idle issue as well. Bleed the coolant as your last step after removing replacing those hoses.
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Old 01-06-2013, 08:05 PM
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Re: What could this problem be? (Video Included)

I can almost guarantee it's the FITV if you know it's not some kind of random vacuum leak.
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